#include <dirent.h>
#include <string.h>
#include <sys/vfs.h>
+#include <sys/ipc.h>
+#include <sys/sem.h>
+#include <sys/shm.h>
#include <netinet/in.h>
#ifndef NO_ASMSIGNALH
#include <asm/signal.h>
#define HAVE_MEMMOVE
#define USE_SIGPROCMASK
#define USE_WAITPID
+#define USE_SYSV_IPC
#if 0
/* SETFS disabled until we can check on some bug reports */
#if _LINUX_C_LIB_VERSION_MAJOR >= 5
#include <sys/statvfs.h>
#include <sys/filio.h>
#include <sys/sockio.h>
+#include <sys/ipc.h>
+#include <sys/sem.h>
+#include <sys/shm.h>
#include <netinet/in_systm.h>
#include <netinet/tcp.h>
#include <netinet/ip.h>
#define USE_STATVFS
#define USE_GETCWD
#define USE_SETSID
+#define USE_SYSV_IPC
#ifndef REPLACE_GETPASS
#define REPLACE_GETPASS
#endif /* REPLACE_GETPASS */
#include <sys/types.h>
#include <sys/termios.h>
#include <netinet/tcp.h>
+#include <sys/ipc.h>
+#include <sys/sem.h>
+#include <sys/shm.h>
#ifdef HPUX_10_TRUSTED
#include <hpsecurity.h>
#include <prot.h>
#define USE_GETCWD
#define USE_SETSID
#define USE_SETRES
+#define USE_SYSV_IPC
#define DEFAULT_PRINTING PRINT_HPUX
/* Ken Weiss <krweiss@ucdavis.edu> tells us that SIGCLD_IGNORE is
not good for HPUX */
/*The following definitions come from shmem.c */
-BOOL smb_shm_open(char *file_name, int size, int ronly);
-BOOL smb_shm_close( void );
-int smb_shm_alloc(int size);
-BOOL smb_shm_free(int offset);
-int smb_shm_get_userdef_off(void);
-void *smb_shm_offset2addr(int offset);
-int smb_shm_addr2offset(void *addr);
-BOOL smb_shm_lock_hash_entry( unsigned int entry);
-BOOL smb_shm_unlock_hash_entry( unsigned int entry );
-BOOL smb_shm_get_usage(int *bytes_free,
- int *bytes_used,
- int *bytes_overhead);
+struct shmem_ops *smb_shm_open(char *file_name, int size, int ronly);
+
+/*The following definitions come from shmem_sysv.c */
+
+struct shmem_ops *sysv_shm_open(int size, int ronly);
/*The following definitions come from smbdes.c */
/* Default number of hash buckets used in shared memory share mode */
#ifndef SHMEM_HASH_SIZE
+#ifdef SEMMSL
+#define SHMEM_HASH_SIZE (SEMMSL-1)
+#else
#define SHMEM_HASH_SIZE 113
#endif
+#endif
#define NMB_PORT 137
#define DGRAM_PORT 138
/* each implementation of the shared memory code needs
to support the following operations */
struct shmem_ops {
- BOOL (*open)(char *, int );
BOOL (*close)( void );
int (*alloc)(int );
BOOL (*free)(int );
extern connection_struct Connections[];
extern files_struct Files[];
+static struct shmem_ops *shmops;
+
/* share mode record pointed to in shared memory hash bucket */
typedef struct
{
******************************************************************/
static BOOL shm_stop_share_mode_mgmt(void)
{
- return smb_shm_close();
+ return shmops->close();
}
/*******************************************************************
******************************************************************/
static BOOL shm_lock_share_entry(int cnum, uint32 dev, uint32 inode, int *ptok)
{
- return smb_shm_lock_hash_entry(HASH_ENTRY(dev, inode));
+ return shmops->lock_hash_entry(HASH_ENTRY(dev, inode));
}
/*******************************************************************
******************************************************************/
static BOOL shm_unlock_share_entry(int cnum, uint32 dev, uint32 inode, int token)
{
- return smb_shm_unlock_hash_entry(HASH_ENTRY(dev, inode));
+ return shmops->unlock_hash_entry(HASH_ENTRY(dev, inode));
}
/*******************************************************************
return 0;
}
- mode_array = (int *)smb_shm_offset2addr(smb_shm_get_userdef_off());
+ mode_array = (int *)shmops->offset2addr(shmops->get_userdef_off());
if(mode_array[hash_entry] == NULL_OFFSET)
{
return 0;
}
- file_scanner_p = (share_mode_record *)smb_shm_offset2addr(mode_array[hash_entry]);
+ file_scanner_p = (share_mode_record *)shmops->offset2addr(mode_array[hash_entry]);
file_prev_p = file_scanner_p;
while(file_scanner_p)
{
else
{
file_prev_p = file_scanner_p ;
- file_scanner_p = (share_mode_record *)smb_shm_offset2addr(
+ file_scanner_p = (share_mode_record *)shmops->offset2addr(
file_scanner_p->next_offset);
}
}
mode_array[hash_entry] = file_scanner_p->next_offset;
else
file_prev_p->next_offset = file_scanner_p->next_offset;
- smb_shm_free(smb_shm_addr2offset(file_scanner_p));
+ shmops->free(shmops->addr2offset(file_scanner_p));
return (0);
}
num_entries_copied = 0;
- entry_scanner_p = (shm_share_mode_entry*)smb_shm_offset2addr(
+ entry_scanner_p = (shm_share_mode_entry*)shmops->offset2addr(
file_scanner_p->share_mode_entries);
entry_prev_p = entry_scanner_p;
while(entry_scanner_p)
{
/* We are at start of list */
file_scanner_p->share_mode_entries = entry_scanner_p->next_share_mode_entry;
- entry_scanner_p = (shm_share_mode_entry*)smb_shm_offset2addr(
+ entry_scanner_p = (shm_share_mode_entry*)shmops->offset2addr(
file_scanner_p->share_mode_entries);
entry_prev_p = entry_scanner_p;
}
{
entry_prev_p->next_share_mode_entry = entry_scanner_p->next_share_mode_entry;
entry_scanner_p = (shm_share_mode_entry*)
- smb_shm_offset2addr(entry_scanner_p->next_share_mode_entry);
+ shmops->offset2addr(entry_scanner_p->next_share_mode_entry);
}
/* Decrement the number of share mode entries on this share mode record */
file_scanner_p->num_share_mode_entries -= 1;
pid, share_mode, dev, inode, hash_entry,
file_scanner_p->num_share_mode_entries));
- smb_shm_free(smb_shm_addr2offset(delete_entry_p));
+ shmops->free(shmops->addr2offset(delete_entry_p));
}
else
{
record mode 0x%X pid=%d\n", entry_scanner_p->e.share_mode, entry_scanner_p->e.pid));
entry_prev_p = entry_scanner_p;
entry_scanner_p = (shm_share_mode_entry *)
- smb_shm_offset2addr(entry_scanner_p->next_share_mode_entry);
+ shmops->offset2addr(entry_scanner_p->next_share_mode_entry);
}
}
mode_array[hash_entry] = file_scanner_p->next_offset;
else
file_prev_p->next_offset = file_scanner_p->next_offset;
- smb_shm_free(smb_shm_addr2offset(file_scanner_p));
+ shmops->free(shmops->addr2offset(file_scanner_p));
}
DEBUG(5,("get_share_modes (FAST_SHARE_MODES): file with dev %d, inode %d in \
return;
}
- mode_array = (int *)smb_shm_offset2addr(smb_shm_get_userdef_off());
+ mode_array = (int *)shmops->offset2addr(shmops->get_userdef_off());
if(mode_array[hash_entry] == NULL_OFFSET)
{
return;
}
- file_scanner_p = (share_mode_record *)smb_shm_offset2addr(mode_array[hash_entry]);
+ file_scanner_p = (share_mode_record *)shmops->offset2addr(mode_array[hash_entry]);
file_prev_p = file_scanner_p;
while(file_scanner_p)
{
file_prev_p = file_scanner_p ;
file_scanner_p = (share_mode_record *)
- smb_shm_offset2addr(file_scanner_p->next_offset);
+ shmops->offset2addr(file_scanner_p->next_offset);
}
}
mode_array[hash_entry] = file_scanner_p->next_offset;
else
file_prev_p->next_offset = file_scanner_p->next_offset;
- smb_shm_free(smb_shm_addr2offset(file_scanner_p));
+ shmops->free(shmops->addr2offset(file_scanner_p));
return;
}
found = False;
- entry_scanner_p = (shm_share_mode_entry*)smb_shm_offset2addr(
+ entry_scanner_p = (shm_share_mode_entry*)shmops->offset2addr(
file_scanner_p->share_mode_entries);
entry_prev_p = entry_scanner_p;
while(entry_scanner_p)
{
entry_prev_p = entry_scanner_p;
entry_scanner_p = (shm_share_mode_entry *)
- smb_shm_offset2addr(entry_scanner_p->next_share_mode_entry);
+ shmops->offset2addr(entry_scanner_p->next_share_mode_entry);
}
}
file_scanner_p->share_mode_entries = entry_scanner_p->next_share_mode_entry;
else
entry_prev_p->next_share_mode_entry = entry_scanner_p->next_share_mode_entry;
- smb_shm_free(smb_shm_addr2offset(entry_scanner_p));
+ shmops->free(shmops->addr2offset(entry_scanner_p));
/* PARANOIA TEST */
if(file_scanner_p->num_share_mode_entries < 0)
mode_array[hash_entry] = file_scanner_p->next_offset;
else
file_prev_p->next_offset = file_scanner_p->next_offset;
- smb_shm_free(smb_shm_addr2offset(file_scanner_p));
+ shmops->free(shmops->addr2offset(file_scanner_p));
}
}
else
return False;
}
- mode_array = (int *)smb_shm_offset2addr(smb_shm_get_userdef_off());
+ mode_array = (int *)shmops->offset2addr(shmops->get_userdef_off());
- file_scanner_p = (share_mode_record *)smb_shm_offset2addr(mode_array[hash_entry]);
+ file_scanner_p = (share_mode_record *)shmops->offset2addr(mode_array[hash_entry]);
file_prev_p = file_scanner_p;
while(file_scanner_p)
{
file_prev_p = file_scanner_p ;
file_scanner_p = (share_mode_record *)
- smb_shm_offset2addr(file_scanner_p->next_offset);
+ shmops->offset2addr(file_scanner_p->next_offset);
}
}
{
/* We must create a share_mode_record */
share_mode_record *new_mode_p = NULL;
- int new_offset = smb_shm_alloc( sizeof(share_mode_record) +
+ int new_offset = shmops->alloc( sizeof(share_mode_record) +
strlen(fs_p->name) + 1);
if(new_offset == NULL_OFFSET)
{
- DEBUG(0,("ERROR:set_share_mode (FAST_SHARE_MODES): smb_shm_alloc fail !\n"));
+ DEBUG(0,("ERROR:set_share_mode (FAST_SHARE_MODES): shmops->alloc fail !\n"));
return False;
}
- new_mode_p = smb_shm_offset2addr(new_offset);
+ new_mode_p = shmops->offset2addr(new_offset);
new_mode_p->locking_version = LOCKING_VERSION;
new_mode_p->st_dev = dev;
new_mode_p->st_ino = inode;
}
/* Now create the share mode entry */
- new_entry_offset = smb_shm_alloc( sizeof(shm_share_mode_entry));
+ new_entry_offset = shmops->alloc( sizeof(shm_share_mode_entry));
if(new_entry_offset == NULL_OFFSET)
{
int delete_offset = mode_array[hash_entry];
- DEBUG(0,("ERROR:set_share_mode (FAST_SHARE_MODES): smb_shm_alloc fail 1!\n"));
+ DEBUG(0,("ERROR:set_share_mode (FAST_SHARE_MODES): shmops->alloc fail 1!\n"));
/* Unlink the damaged record */
mode_array[hash_entry] = file_scanner_p->next_offset;
/* And delete it */
- smb_shm_free( delete_offset );
+ shmops->free( delete_offset );
return False;
}
- new_entry_p = smb_shm_offset2addr(new_entry_offset);
+ new_entry_p = shmops->offset2addr(new_entry_offset);
new_entry_p->e.pid = getpid();
new_entry_p->e.share_mode = fs_p->share_mode;
return False;
}
- mode_array = (int *)smb_shm_offset2addr(smb_shm_get_userdef_off());
+ mode_array = (int *)shmops->offset2addr(shmops->get_userdef_off());
if(mode_array[hash_entry] == NULL_OFFSET)
{
return False;
}
- file_scanner_p = (share_mode_record *)smb_shm_offset2addr(mode_array[hash_entry]);
+ file_scanner_p = (share_mode_record *)shmops->offset2addr(mode_array[hash_entry]);
file_prev_p = file_scanner_p;
while(file_scanner_p)
{
file_prev_p = file_scanner_p ;
file_scanner_p = (share_mode_record *)
- smb_shm_offset2addr(file_scanner_p->next_offset);
+ shmops->offset2addr(file_scanner_p->next_offset);
}
}
mode_array[hash_entry] = file_scanner_p->next_offset;
else
file_prev_p->next_offset = file_scanner_p->next_offset;
- smb_shm_free(smb_shm_addr2offset(file_scanner_p));
+ shmops->free(shmops->addr2offset(file_scanner_p));
return False;
}
found = False;
- entry_scanner_p = (shm_share_mode_entry*)smb_shm_offset2addr(
+ entry_scanner_p = (shm_share_mode_entry*)shmops->offset2addr(
file_scanner_p->share_mode_entries);
entry_prev_p = entry_scanner_p;
while(entry_scanner_p)
{
entry_prev_p = entry_scanner_p;
entry_scanner_p = (shm_share_mode_entry *)
- smb_shm_offset2addr(entry_scanner_p->next_share_mode_entry);
+ shmops->offset2addr(entry_scanner_p->next_share_mode_entry);
}
}
int *mode_array;
share_mode_record *file_scanner_p;
- mode_array = (int *)smb_shm_offset2addr(smb_shm_get_userdef_off());
+ mode_array = (int *)shmops->offset2addr(shmops->get_userdef_off());
for( i = 0; i < lp_shmem_hash_size(); i++) {
- smb_shm_lock_hash_entry(i);
+ shmops->lock_hash_entry(i);
if(mode_array[i] == NULL_OFFSET) {
- smb_shm_unlock_hash_entry(i);
+ shmops->unlock_hash_entry(i);
continue;
}
- file_scanner_p = (share_mode_record *)smb_shm_offset2addr(mode_array[i]);
+ file_scanner_p = (share_mode_record *)shmops->offset2addr(mode_array[i]);
while((file_scanner_p != 0) &&
(file_scanner_p->num_share_mode_entries != 0)) {
shm_share_mode_entry *entry_scanner_p =
(shm_share_mode_entry *)
- smb_shm_offset2addr(file_scanner_p->share_mode_entries);
+ shmops->offset2addr(file_scanner_p->share_mode_entries);
while(entry_scanner_p != 0) {
entry_scanner_p =
(shm_share_mode_entry *)
- smb_shm_offset2addr(
+ shmops->offset2addr(
entry_scanner_p->next_share_mode_entry);
count++;
} /* end while entry_scanner_p */
file_scanner_p = (share_mode_record *)
- smb_shm_offset2addr(file_scanner_p->next_offset);
+ shmops->offset2addr(file_scanner_p->next_offset);
} /* end while file_scanner_p */
- smb_shm_unlock_hash_entry(i);
+ shmops->unlock_hash_entry(i);
} /* end for */
return count;
{
int bytes_free, bytes_used, bytes_overhead, bytes_total;
- smb_shm_get_usage(&bytes_free, &bytes_used, &bytes_overhead);
+ shmops->get_usage(&bytes_free, &bytes_used, &bytes_overhead);
bytes_total = bytes_free + bytes_used + bytes_overhead;
fprintf(f, "Share mode memory usage (bytes):\n");
pstring shmem_file_name;
read_only = ronly;
-
+
+#ifdef USE_SYSV_IPC
+ shmops = sysv_shm_open(lp_shmem_size(), read_only);
+ if (shmops) return &share_ops;
+#endif
+
pstrcpy(shmem_file_name,lp_lockdir());
if (!directory_exist(shmem_file_name,NULL)) {
if (read_only) return NULL;
trim_string(shmem_file_name,"","/");
if (!*shmem_file_name) return(False);
strcat(shmem_file_name, "/SHARE_MEM_FILE");
- if (smb_shm_open(shmem_file_name, lp_shmem_size(), read_only))
- return &share_ops;
+ shmops = smb_shm_open(shmem_file_name, lp_shmem_size(), read_only);
+ if (shmops) return &share_ops;
+
return NULL;
}
}
+
+static void *smb_shm_offset2addr(int offset)
+{
+ if (offset == NULL_OFFSET )
+ return (void *)(0);
+
+ if (!smb_shm_header_p)
+ return (void *)(0);
+
+ return (void *)((char *)smb_shm_header_p + offset );
+}
+
+static int smb_shm_addr2offset(void *addr)
+{
+ if (!addr)
+ return NULL_OFFSET;
+
+ if (!smb_shm_header_p)
+ return NULL_OFFSET;
+
+ return (int)((char *)addr - (char *)smb_shm_header_p);
+}
+
+
+
+static int smb_shm_alloc(int size)
+{
+ unsigned num_cells ;
+ struct SmbShmBlockDesc *scanner_p;
+ struct SmbShmBlockDesc *prev_p;
+ struct SmbShmBlockDesc *new_p;
+ int result_offset;
+
+
+ if( !smb_shm_header_p )
+ {
+ /* not mapped yet */
+ DEBUG(0,("ERROR smb_shm_alloc : shmem not mapped\n"));
+ return NULL_OFFSET;
+ }
+
+ smb_shm_global_lock();
+
+ if( !smb_shm_header_p->consistent)
+ {
+ DEBUG(0,("ERROR smb_shm_alloc : shmem not consistent\n"));
+ smb_shm_global_unlock();
+ return NULL_OFFSET;
+ }
+
+
+ /* calculate the number of cells */
+ num_cells = (size + CellSize -1) / CellSize;
+
+ /* set start of scan */
+ prev_p = (struct SmbShmBlockDesc *)smb_shm_offset2addr(smb_shm_header_p->first_free_off);
+ scanner_p = prev_p ;
+
+ /* scan the free list to find a matching free space */
+ while ( ( scanner_p != EOList_Addr ) && ( scanner_p->size < num_cells ) )
+ {
+ prev_p = scanner_p;
+ scanner_p = (struct SmbShmBlockDesc *)smb_shm_offset2addr(scanner_p->next);
+ }
+
+ /* at this point scanner point to a block header or to the end of the list */
+ if ( scanner_p == EOList_Addr )
+ {
+ DEBUG(0,("ERROR smb_shm_alloc : alloc of %d bytes failed, no free space found\n",size));
+ smb_shm_global_unlock();
+ return (NULL_OFFSET);
+ }
+
+ /* going to modify shared mem */
+ smb_shm_header_p->consistent = False;
+
+ /* if we found a good one : scanner == the good one */
+ if ( scanner_p->size <= num_cells + 2 )
+ {
+ /* there is no use in making a new one, it will be too small anyway
+ * we will link out scanner
+ */
+ if ( prev_p == scanner_p )
+ {
+ smb_shm_header_p->first_free_off = scanner_p->next ;
+ }
+ else
+ {
+ prev_p->next = scanner_p->next ;
+ }
+ smb_shm_header_p->statistics.cells_free -= scanner_p->size;
+ smb_shm_header_p->statistics.cells_used += scanner_p->size;
+ }
+ else
+ {
+ /* Make a new one */
+ new_p = scanner_p + 1 + num_cells;
+ new_p->size = scanner_p->size - num_cells - 1;
+ new_p->next = scanner_p->next;
+ scanner_p->size = num_cells;
+ scanner_p->next = smb_shm_addr2offset(new_p);
+
+ if ( prev_p != scanner_p )
+ {
+ prev_p->next = smb_shm_addr2offset(new_p) ;
+ }
+ else
+ {
+ smb_shm_header_p->first_free_off = smb_shm_addr2offset(new_p) ;
+ }
+ smb_shm_header_p->statistics.cells_free -= num_cells+1;
+ smb_shm_header_p->statistics.cells_used += num_cells;
+ smb_shm_header_p->statistics.cells_system += 1;
+ }
+
+ result_offset = smb_shm_addr2offset( &(scanner_p[1]) );
+ scanner_p->next = SMB_SHM_NOT_FREE_OFF ;
+
+ /* end modification of shared mem */
+ smb_shm_header_p->consistent = True;
+
+ DEBUG(6,("smb_shm_alloc : request for %d bytes, allocated %d bytes at offset %d\n",size,scanner_p->size*CellSize,result_offset ));
+
+ smb_shm_global_unlock();
+ return ( result_offset );
+}
+
+
+
+
/*
* Function to create the hash table for the share mode entries. Called
* when smb shared memory is global locked.
-BOOL smb_shm_open(char *file_name, int size, int ronly)
-{
- int filesize;
- BOOL created_new = False;
- BOOL other_processes = True;
-
- read_only = ronly;
-
- DEBUG(5,("smb_shm_open : using shmem file %s to be of size %d\n",file_name,size));
-
- smb_shm_fd = open(file_name, read_only?O_RDONLY:(O_RDWR|O_CREAT),
- SHM_FILE_MODE);
-
- if ( smb_shm_fd < 0 )
- {
- DEBUG(0,("ERROR smb_shm_open : open failed with code %s\n",strerror(errno)));
- return False;
- }
-
- if (!smb_shm_global_lock())
- {
- DEBUG(0,("ERROR smb_shm_open : can't do smb_shm_global_lock\n"));
- return False;
- }
-
- if( (filesize = lseek(smb_shm_fd, 0, SEEK_END)) < 0)
- {
- DEBUG(0,("ERROR smb_shm_open : lseek failed with code %s\n",strerror(errno)));
- smb_shm_global_unlock();
- close(smb_shm_fd);
- return False;
- }
-
- /* return the file offset to 0 to save on later seeks */
- lseek(smb_shm_fd,0,SEEK_SET);
-
- if (filesize == 0)
- {
- /* we just created a new one */
- created_new = True;
- }
-
- /* to find out if some other process is already mapping the file,
- we use a registration file containing the processids of the file mapping processes
- */
-
- /* construct processreg file name */
- strcpy(smb_shm_processreg_name, file_name);
- strcat(smb_shm_processreg_name, ".processes");
-
- if (!read_only &&
- !smb_shm_register_process(smb_shm_processreg_name, getpid(), &other_processes))
- {
- smb_shm_global_unlock();
- close(smb_shm_fd);
- return False;
- }
-
- if (!read_only && (created_new || !other_processes))
- {
- /* we just created a new one, or are the first opener, lets set it size */
- if( ftruncate(smb_shm_fd, size) <0)
- {
- DEBUG(0,("ERROR smb_shm_open : ftruncate failed with code %s\n",strerror(errno)));
- smb_shm_unregister_process(smb_shm_processreg_name, getpid());
- smb_shm_global_unlock();
- close(smb_shm_fd);
- return False;
- }
-
- /* paranoia */
- lseek(smb_shm_fd,0,SEEK_SET);
-
- filesize = size;
- }
-
- if (size != filesize )
- {
- /* the existing file has a different size and we are not the first opener.
- Since another process is still using it, we will use the file size */
- DEBUG(0,("WARNING smb_shm_open : filesize (%d) != expected size (%d), using filesize\n",filesize,size));
- size = filesize;
- }
-
- smb_shm_header_p = (struct SmbShmHeader *)mmap(NULL, size,
- read_only?PROT_READ:
- (PROT_READ | PROT_WRITE),
- MAP_FILE | MAP_SHARED,
- smb_shm_fd, 0);
- /* WARNING, smb_shm_header_p can be different for different processes mapping the same file ! */
- if (smb_shm_header_p == (struct SmbShmHeader *)(-1))
- {
- DEBUG(0,("ERROR smb_shm_open : mmap failed with code %s\n",strerror(errno)));
- smb_shm_unregister_process(smb_shm_processreg_name, getpid());
- smb_shm_global_unlock();
- close(smb_shm_fd);
- return False;
- }
-
-
- if (!read_only && (created_new || !other_processes))
- {
- smb_shm_initialize(size);
- /* Create the hash buckets for the share file entries. */
- smb_shm_create_hash_table( lp_shmem_hash_size() );
- }
- else if (!smb_shm_validate_header(size) )
- {
- /* existing file is corrupt, samba admin should remove it by hand */
- DEBUG(0,("ERROR smb_shm_open : corrupt shared mem file, remove it manually\n"));
- munmap((caddr_t)smb_shm_header_p, size);
- smb_shm_unregister_process(smb_shm_processreg_name, getpid());
- smb_shm_global_unlock();
- close(smb_shm_fd);
- return False;
- }
-
- smb_shm_global_unlock();
- return True;
-
-}
-
-
-BOOL smb_shm_close( void )
+static BOOL smb_shm_close( void )
{
if(smb_shm_initialize_called == False)
return True;
}
-int smb_shm_alloc(int size)
-{
- unsigned num_cells ;
- struct SmbShmBlockDesc *scanner_p;
- struct SmbShmBlockDesc *prev_p;
- struct SmbShmBlockDesc *new_p;
- int result_offset;
-
-
- if( !smb_shm_header_p )
- {
- /* not mapped yet */
- DEBUG(0,("ERROR smb_shm_alloc : shmem not mapped\n"));
- return NULL_OFFSET;
- }
-
- smb_shm_global_lock();
- if( !smb_shm_header_p->consistent)
- {
- DEBUG(0,("ERROR smb_shm_alloc : shmem not consistent\n"));
- smb_shm_global_unlock();
- return NULL_OFFSET;
- }
-
-
- /* calculate the number of cells */
- num_cells = (size + CellSize -1) / CellSize;
-
- /* set start of scan */
- prev_p = (struct SmbShmBlockDesc *)smb_shm_offset2addr(smb_shm_header_p->first_free_off);
- scanner_p = prev_p ;
-
- /* scan the free list to find a matching free space */
- while ( ( scanner_p != EOList_Addr ) && ( scanner_p->size < num_cells ) )
- {
- prev_p = scanner_p;
- scanner_p = (struct SmbShmBlockDesc *)smb_shm_offset2addr(scanner_p->next);
- }
-
- /* at this point scanner point to a block header or to the end of the list */
- if ( scanner_p == EOList_Addr )
- {
- DEBUG(0,("ERROR smb_shm_alloc : alloc of %d bytes failed, no free space found\n",size));
- smb_shm_global_unlock();
- return (NULL_OFFSET);
- }
-
- /* going to modify shared mem */
- smb_shm_header_p->consistent = False;
-
- /* if we found a good one : scanner == the good one */
- if ( scanner_p->size <= num_cells + 2 )
- {
- /* there is no use in making a new one, it will be too small anyway
- * we will link out scanner
- */
- if ( prev_p == scanner_p )
- {
- smb_shm_header_p->first_free_off = scanner_p->next ;
- }
- else
- {
- prev_p->next = scanner_p->next ;
- }
- smb_shm_header_p->statistics.cells_free -= scanner_p->size;
- smb_shm_header_p->statistics.cells_used += scanner_p->size;
- }
- else
- {
- /* Make a new one */
- new_p = scanner_p + 1 + num_cells;
- new_p->size = scanner_p->size - num_cells - 1;
- new_p->next = scanner_p->next;
- scanner_p->size = num_cells;
- scanner_p->next = smb_shm_addr2offset(new_p);
-
- if ( prev_p != scanner_p )
- {
- prev_p->next = smb_shm_addr2offset(new_p) ;
- }
- else
- {
- smb_shm_header_p->first_free_off = smb_shm_addr2offset(new_p) ;
- }
- smb_shm_header_p->statistics.cells_free -= num_cells+1;
- smb_shm_header_p->statistics.cells_used += num_cells;
- smb_shm_header_p->statistics.cells_system += 1;
- }
-
- result_offset = smb_shm_addr2offset( &(scanner_p[1]) );
- scanner_p->next = SMB_SHM_NOT_FREE_OFF ;
-
- /* end modification of shared mem */
- smb_shm_header_p->consistent = True;
-
- DEBUG(6,("smb_shm_alloc : request for %d bytes, allocated %d bytes at offset %d\n",size,scanner_p->size*CellSize,result_offset ));
-
- smb_shm_global_unlock();
- return ( result_offset );
-}
-
-
-
-BOOL smb_shm_free(int offset)
+static BOOL smb_shm_free(int offset)
{
struct SmbShmBlockDesc *header_p ; /* pointer to header of block to free */
struct SmbShmBlockDesc *scanner_p ; /* used to scan the list */
}
}
-int smb_shm_get_userdef_off(void)
+static int smb_shm_get_userdef_off(void)
{
if (!smb_shm_header_p)
return NULL_OFFSET;
return smb_shm_header_p->userdef_off;
}
-void *smb_shm_offset2addr(int offset)
-{
- if (offset == NULL_OFFSET )
- return (void *)(0);
-
- if (!smb_shm_header_p)
- return (void *)(0);
-
- return (void *)((char *)smb_shm_header_p + offset );
-}
-
-int smb_shm_addr2offset(void *addr)
-{
- if (!addr)
- return NULL_OFFSET;
-
- if (!smb_shm_header_p)
- return NULL_OFFSET;
-
- return (int)((char *)addr - (char *)smb_shm_header_p);
-}
-
/*******************************************************************
Lock a particular hash bucket entry.
******************************************************************/
-
-BOOL smb_shm_lock_hash_entry( unsigned int entry)
+static BOOL smb_shm_lock_hash_entry( unsigned int entry)
{
int start = (smb_shm_header_p->userdef_off + (entry * sizeof(int)));
/*******************************************************************
Unlock a particular hash bucket entry.
******************************************************************/
-
-BOOL smb_shm_unlock_hash_entry( unsigned int entry )
+static BOOL smb_shm_unlock_hash_entry( unsigned int entry )
{
int start = (smb_shm_header_p->userdef_off + (entry * sizeof(int)));
/*******************************************************************
Gather statistics on shared memory usage.
******************************************************************/
-
-BOOL smb_shm_get_usage(int *bytes_free,
+static BOOL smb_shm_get_usage(int *bytes_free,
int *bytes_used,
int *bytes_overhead)
{
return True;
}
+
+static struct shmem_ops shmops = {
+ smb_shm_close,
+ smb_shm_alloc,
+ smb_shm_free,
+ smb_shm_get_userdef_off,
+ smb_shm_offset2addr,
+ smb_shm_addr2offset,
+ smb_shm_lock_hash_entry,
+ smb_shm_unlock_hash_entry,
+ smb_shm_get_usage,
+};
+
+/*******************************************************************
+ open the shared memory
+ ******************************************************************/
+struct shmem_ops *smb_shm_open(char *file_name, int size, int ronly)
+{
+ int filesize;
+ BOOL created_new = False;
+ BOOL other_processes = True;
+
+ read_only = ronly;
+
+ DEBUG(5,("smb_shm_open : using shmem file %s to be of size %d\n",file_name,size));
+
+ smb_shm_fd = open(file_name, read_only?O_RDONLY:(O_RDWR|O_CREAT),
+ SHM_FILE_MODE);
+
+ if ( smb_shm_fd < 0 )
+ {
+ DEBUG(0,("ERROR smb_shm_open : open failed with code %s\n",strerror(errno)));
+ return NULL;
+ }
+
+ if (!smb_shm_global_lock())
+ {
+ DEBUG(0,("ERROR smb_shm_open : can't do smb_shm_global_lock\n"));
+ return NULL;
+ }
+
+ if( (filesize = lseek(smb_shm_fd, 0, SEEK_END)) < 0)
+ {
+ DEBUG(0,("ERROR smb_shm_open : lseek failed with code %s\n",strerror(errno)));
+ smb_shm_global_unlock();
+ close(smb_shm_fd);
+ return NULL;
+ }
+
+ /* return the file offset to 0 to save on later seeks */
+ lseek(smb_shm_fd,0,SEEK_SET);
+
+ if (filesize == 0)
+ {
+ /* we just created a new one */
+ created_new = True;
+ }
+
+ /* to find out if some other process is already mapping the file,
+ we use a registration file containing the processids of the file mapping processes
+ */
+
+ /* construct processreg file name */
+ strcpy(smb_shm_processreg_name, file_name);
+ strcat(smb_shm_processreg_name, ".processes");
+
+ if (!read_only &&
+ !smb_shm_register_process(smb_shm_processreg_name, getpid(), &other_processes))
+ {
+ smb_shm_global_unlock();
+ close(smb_shm_fd);
+ return NULL;
+ }
+
+ if (!read_only && (created_new || !other_processes))
+ {
+ /* we just created a new one, or are the first opener, lets set it size */
+ if( ftruncate(smb_shm_fd, size) <0)
+ {
+ DEBUG(0,("ERROR smb_shm_open : ftruncate failed with code %s\n",strerror(errno)));
+ smb_shm_unregister_process(smb_shm_processreg_name, getpid());
+ smb_shm_global_unlock();
+ close(smb_shm_fd);
+ return NULL;
+ }
+
+ /* paranoia */
+ lseek(smb_shm_fd,0,SEEK_SET);
+
+ filesize = size;
+ }
+
+ if (size != filesize )
+ {
+ /* the existing file has a different size and we are not the first opener.
+ Since another process is still using it, we will use the file size */
+ DEBUG(0,("WARNING smb_shm_open : filesize (%d) != expected size (%d), using filesize\n",filesize,size));
+ size = filesize;
+ }
+
+ smb_shm_header_p = (struct SmbShmHeader *)mmap(NULL, size,
+ read_only?PROT_READ:
+ (PROT_READ | PROT_WRITE),
+ MAP_FILE | MAP_SHARED,
+ smb_shm_fd, 0);
+ /* WARNING, smb_shm_header_p can be different for different processes mapping the same file ! */
+ if (smb_shm_header_p == (struct SmbShmHeader *)(-1))
+ {
+ DEBUG(0,("ERROR smb_shm_open : mmap failed with code %s\n",strerror(errno)));
+ smb_shm_unregister_process(smb_shm_processreg_name, getpid());
+ smb_shm_global_unlock();
+ close(smb_shm_fd);
+ return NULL;
+ }
+
+
+ if (!read_only && (created_new || !other_processes))
+ {
+ smb_shm_initialize(size);
+ /* Create the hash buckets for the share file entries. */
+ smb_shm_create_hash_table( lp_shmem_hash_size() );
+ }
+ else if (!smb_shm_validate_header(size) )
+ {
+ /* existing file is corrupt, samba admin should remove it by hand */
+ DEBUG(0,("ERROR smb_shm_open : corrupt shared mem file, remove it manually\n"));
+ munmap((caddr_t)smb_shm_header_p, size);
+ smb_shm_unregister_process(smb_shm_processreg_name, getpid());
+ smb_shm_global_unlock();
+ close(smb_shm_fd);
+ return NULL;
+ }
+
+ smb_shm_global_unlock();
+ return &shmops;
+}
+
+
#else /* FAST_SHARE_MODES */
int shmem_dummy_procedure(void)
{return 0;}
--- /dev/null
+/*
+ Unix SMB/Netbios implementation.
+ Version 1.9.
+ Shared memory functions - SYSV IPC implementation
+ Copyright (C) Erik Devriendt 1996-1997
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include "includes.h"
+
+
+#ifdef USE_SYSV_IPC
+
+extern int DEBUGLEVEL;
+
+#define SHMEM_KEY ((key_t)0x280267)
+#define SEMAPHORE_KEY (SHMEM_KEY+2)
+
+#define SHM_MAGIC 0x53484100
+#define SHM_VERSION 2
+
+#define IPC_PERMS ((SHM_R | SHM_W) | (SHM_R>>3) | (SHM_R>>6))
+
+static int shm_id;
+static int sem_id;
+static int shm_size;
+static int hash_size;
+static int global_lock_count;
+
+struct ShmHeader {
+ int shm_magic;
+ int shm_version;
+ int total_size; /* in bytes */
+ BOOL consistent;
+ int first_free_off;
+ int userdef_off; /* a userdefined offset. can be used to store
+ root of tree or list */
+ struct { /* a cell is a range of bytes of sizeof(struct
+ ShmBlockDesc) size */
+ int cells_free;
+ int cells_used;
+ int cells_system; /* number of cells used as allocated
+ block descriptors */
+ } statistics;
+};
+
+#define SHM_NOT_FREE_OFF (-1)
+struct ShmBlockDesc
+{
+ int next; /* offset of next block in the free list or
+ SHM_NOT_FREE_OFF when block in use */
+ int size; /* user size in BlockDescSize units */
+};
+
+#define EOList_Addr (struct ShmBlockDesc *)( 0 )
+#define EOList_Off (NULL_OFFSET)
+
+#define CellSize sizeof(struct ShmBlockDesc)
+
+/* HeaderSize aligned on 8 byte boundary */
+#define AlignedHeaderSize ((sizeof(struct ShmHeader)+7) & ~7)
+
+static struct ShmHeader *shm_header_p = (struct ShmHeader *)0;
+
+static BOOL shm_initialize_called = False;
+
+static int read_only;
+
+static BOOL sem_lock(int i)
+{
+ struct sembuf sb;
+ if (read_only) return True;
+
+ sb.sem_num = i;
+ sb.sem_op = -1;
+ sb.sem_flg = SEM_UNDO;
+
+ if (semop(sem_id, &sb, 1) != 0) {
+ DEBUG(0,("ERROR: IPC lock failed on semaphore %d\n", i));
+ return False;
+ }
+
+ return True;
+}
+
+static BOOL sem_unlock(int i)
+{
+ struct sembuf sb;
+ if (read_only) return True;
+
+ sb.sem_num = i;
+ sb.sem_op = 1;
+ sb.sem_flg = SEM_UNDO;
+
+ if (semop(sem_id, &sb, 1) != 0) {
+ DEBUG(0,("ERROR: IPC unlock failed on semaphore %d\n", i));
+ return False;
+ }
+
+ return True;
+}
+
+static BOOL global_lock(void)
+{
+ global_lock_count++;
+ if (global_lock_count == 1)
+ return sem_lock(0);
+ return True;
+}
+
+static BOOL global_unlock(void)
+{
+ global_lock_count--;
+ if (global_lock_count == 0)
+ return sem_unlock(0);
+ return True;
+}
+
+static void *shm_offset2addr(int offset)
+{
+ if (offset == NULL_OFFSET )
+ return (void *)(0);
+
+ if (!shm_header_p)
+ return (void *)(0);
+
+ return (void *)((char *)shm_header_p + offset );
+}
+
+static int shm_addr2offset(void *addr)
+{
+ if (!addr)
+ return NULL_OFFSET;
+
+ if (!shm_header_p)
+ return NULL_OFFSET;
+
+ return (int)((char *)addr - (char *)shm_header_p);
+}
+
+
+static int shm_alloc(int size)
+{
+ unsigned num_cells ;
+ struct ShmBlockDesc *scanner_p;
+ struct ShmBlockDesc *prev_p;
+ struct ShmBlockDesc *new_p;
+ int result_offset;
+
+
+ if (!shm_header_p) {
+ /* not mapped yet */
+ DEBUG(0,("ERROR shm_alloc : shmem not mapped\n"));
+ return NULL_OFFSET;
+ }
+
+ global_lock();
+
+ if (!shm_header_p->consistent) {
+ DEBUG(0,("ERROR shm_alloc : shmem not consistent\n"));
+ global_unlock();
+ return NULL_OFFSET;
+ }
+
+ /* calculate the number of cells */
+ num_cells = (size + CellSize -1) / CellSize;
+
+ /* set start of scan */
+ prev_p = (struct ShmBlockDesc *)shm_offset2addr(shm_header_p->first_free_off);
+ scanner_p = prev_p ;
+
+ /* scan the free list to find a matching free space */
+ while ((scanner_p != EOList_Addr) && (scanner_p->size < num_cells)) {
+ prev_p = scanner_p;
+ scanner_p = (struct ShmBlockDesc *)shm_offset2addr(scanner_p->next);
+ }
+
+ /* at this point scanner point to a block header or to the end of
+ the list */
+ if (scanner_p == EOList_Addr) {
+ DEBUG(0,("ERROR shm_alloc : alloc of %d bytes failed, no free space found\n",size));
+ global_unlock();
+ return (NULL_OFFSET);
+ }
+
+ /* going to modify shared mem */
+ shm_header_p->consistent = False;
+
+ /* if we found a good one : scanner == the good one */
+ if (scanner_p->size <= num_cells + 2) {
+ /* there is no use in making a new one, it will be too small anyway
+ * we will link out scanner
+ */
+ if ( prev_p == scanner_p ) {
+ shm_header_p->first_free_off = scanner_p->next ;
+ } else {
+ prev_p->next = scanner_p->next ;
+ }
+ shm_header_p->statistics.cells_free -= scanner_p->size;
+ shm_header_p->statistics.cells_used += scanner_p->size;
+ } else {
+ /* Make a new one */
+ new_p = scanner_p + 1 + num_cells;
+ new_p->size = scanner_p->size - num_cells - 1;
+ new_p->next = scanner_p->next;
+ scanner_p->size = num_cells;
+ scanner_p->next = shm_addr2offset(new_p);
+
+ if (prev_p != scanner_p) {
+ prev_p->next = shm_addr2offset(new_p) ;
+ } else {
+ shm_header_p->first_free_off = shm_addr2offset(new_p);
+ }
+ shm_header_p->statistics.cells_free -= num_cells+1;
+ shm_header_p->statistics.cells_used += num_cells;
+ shm_header_p->statistics.cells_system += 1;
+ }
+
+ result_offset = shm_addr2offset( &(scanner_p[1]) );
+ scanner_p->next = SHM_NOT_FREE_OFF ;
+
+ /* end modification of shared mem */
+ shm_header_p->consistent = True;
+
+ DEBUG(6,("shm_alloc : request for %d bytes, allocated %d bytes at offset %d\n",size,scanner_p->size*CellSize,result_offset ));
+
+ global_unlock();
+ return result_offset;
+}
+
+
+
+/*
+ * Function to create the hash table for the share mode entries. Called
+ * when smb shared memory is global locked.
+ */
+static BOOL shm_create_hash_table( unsigned int size )
+{
+ size *= sizeof(int);
+
+ global_lock();
+ shm_header_p->userdef_off = shm_alloc( size );
+
+ if(shm_header_p->userdef_off == NULL_OFFSET) {
+ DEBUG(0,("shm_create_hash_table: Failed to create hash table of size %d\n",size));
+ global_unlock();
+ return False;
+ }
+
+ /* Clear hash buckets. */
+ memset( shm_offset2addr(shm_header_p->userdef_off), '\0', size);
+ global_unlock();
+ return True;
+}
+
+static BOOL shm_validate_header(int size)
+{
+ if( !shm_header_p ) {
+ /* not mapped yet */
+ DEBUG(0,("ERROR shm_validate_header : shmem not mapped\n"));
+ return False;
+ }
+
+ if(shm_header_p->shm_magic != SHM_MAGIC) {
+ DEBUG(0,("ERROR shm_validate_header : bad magic\n"));
+ return False;
+ }
+
+ if(shm_header_p->shm_version != SHM_VERSION) {
+ DEBUG(0,("ERROR shm_validate_header : bad version %X\n",shm_header_p->shm_version));
+ return False;
+ }
+
+ if(shm_header_p->total_size != size) {
+ DEBUG(0,("ERROR shm_validate_header : shmem size mismatch (old = %d, new = %d)\n",shm_header_p->total_size,size));
+ return False;
+ }
+
+ if(!shm_header_p->consistent) {
+ DEBUG(0,("ERROR shm_validate_header : shmem not consistent\n"));
+ return False;
+ }
+ return True;
+}
+
+static BOOL shm_initialize(int size)
+{
+ struct ShmBlockDesc * first_free_block_p;
+
+ DEBUG(5,("shm_initialize : initializing shmem file of size %d\n",size));
+
+ if( !shm_header_p ) {
+ /* not mapped yet */
+ DEBUG(0,("ERROR shm_initialize : shmem not mapped\n"));
+ return False;
+ }
+
+ shm_header_p->shm_magic = SHM_MAGIC;
+ shm_header_p->shm_version = SHM_VERSION;
+ shm_header_p->total_size = size;
+ shm_header_p->first_free_off = AlignedHeaderSize;
+ shm_header_p->userdef_off = NULL_OFFSET;
+
+ first_free_block_p = (struct ShmBlockDesc *)shm_offset2addr(shm_header_p->first_free_off);
+ first_free_block_p->next = EOList_Off;
+ first_free_block_p->size = ( size - AlignedHeaderSize - CellSize ) / CellSize ;
+
+ shm_header_p->statistics.cells_free = first_free_block_p->size;
+ shm_header_p->statistics.cells_used = 0;
+ shm_header_p->statistics.cells_system = 1;
+
+ shm_header_p->consistent = True;
+
+ shm_initialize_called = True;
+
+ return True;
+}
+
+static void shm_solve_neighbors(struct ShmBlockDesc *head_p )
+{
+ struct ShmBlockDesc *next_p;
+
+ /* Check if head_p and head_p->next are neighbors and if so
+ join them */
+ if ( head_p == EOList_Addr ) return ;
+ if ( head_p->next == EOList_Off ) return ;
+
+ next_p = (struct ShmBlockDesc *)shm_offset2addr(head_p->next);
+ if ( ( head_p + head_p->size + 1 ) == next_p) {
+ head_p->size += next_p->size +1 ; /* adapt size */
+ head_p->next = next_p->next ; /* link out */
+
+ shm_header_p->statistics.cells_free += 1;
+ shm_header_p->statistics.cells_system -= 1;
+ }
+}
+
+
+
+
+static BOOL shm_close( void )
+{
+ return True;
+}
+
+
+static BOOL shm_free(int offset)
+{
+ struct ShmBlockDesc *header_p; /* pointer to header of
+ block to free */
+ struct ShmBlockDesc *scanner_p; /* used to scan the list */
+ struct ShmBlockDesc *prev_p; /* holds previous in the
+ list */
+
+ if (!shm_header_p) {
+ /* not mapped yet */
+ DEBUG(0,("ERROR shm_free : shmem not mapped\n"));
+ return False;
+ }
+
+ global_lock();
+
+ if (!shm_header_p->consistent) {
+ DEBUG(0,("ERROR shm_free : shmem not consistent\n"));
+ global_unlock();
+ return False;
+ }
+
+ /* make pointer to header of block */
+ header_p = ((struct ShmBlockDesc *)shm_offset2addr(offset) - 1);
+
+ if (header_p->next != SHM_NOT_FREE_OFF) {
+ DEBUG(0,("ERROR shm_free : bad offset (%d)\n",offset));
+ global_unlock();
+ return False;
+ }
+
+ /* find a place in the free_list to put the header in */
+
+ /* set scanner and previous pointer to start of list */
+ prev_p = (struct ShmBlockDesc *)shm_offset2addr(shm_header_p->first_free_off);
+ scanner_p = prev_p ;
+
+ while ((scanner_p != EOList_Addr) &&
+ (scanner_p < header_p)) {
+ /* while we didn't scan past its position */
+ prev_p = scanner_p ;
+ scanner_p = (struct ShmBlockDesc *)shm_offset2addr(scanner_p->next);
+ }
+
+ shm_header_p->consistent = False;
+
+ DEBUG(6,("shm_free : freeing %d bytes at offset %d\n",
+ header_p->size*CellSize,offset));
+
+ if (scanner_p == prev_p) {
+ shm_header_p->statistics.cells_free += header_p->size;
+ shm_header_p->statistics.cells_used -= header_p->size;
+
+ /* we must free it at the beginning of the list */
+ shm_header_p->first_free_off = shm_addr2offset(header_p); /* set the free_list_pointer to this block_header */
+
+ /* scanner is the one that was first in the list */
+ header_p->next = shm_addr2offset(scanner_p);
+ shm_solve_neighbors( header_p ); /* if neighbors then link them */
+
+ shm_header_p->consistent = True;
+ } else {
+ shm_header_p->statistics.cells_free += header_p->size;
+ shm_header_p->statistics.cells_used -= header_p->size;
+
+ prev_p->next = shm_addr2offset(header_p);
+ header_p->next = shm_addr2offset(scanner_p);
+ shm_solve_neighbors(header_p) ;
+ shm_solve_neighbors(prev_p) ;
+
+ shm_header_p->consistent = True;
+ }
+
+ global_unlock();
+ return True;
+}
+
+
+static int shm_get_userdef_off(void)
+{
+ if (!shm_header_p)
+ return NULL_OFFSET;
+ else
+ return shm_header_p->userdef_off;
+}
+
+/*******************************************************************
+ Lock a particular hash bucket entry.
+ ******************************************************************/
+static BOOL shm_lock_hash_entry(unsigned int entry)
+{
+ DEBUG(0,("hash lock %d\n", entry));
+ return sem_lock(entry+1);
+}
+
+/*******************************************************************
+ Unlock a particular hash bucket entry.
+ ******************************************************************/
+static BOOL shm_unlock_hash_entry(unsigned int entry)
+{
+ DEBUG(0,("hash unlock %d\n", entry));
+ return sem_unlock(entry+1);
+}
+
+
+/*******************************************************************
+ Gather statistics on shared memory usage.
+ ******************************************************************/
+static BOOL shm_get_usage(int *bytes_free,
+ int *bytes_used,
+ int *bytes_overhead)
+{
+ if(!shm_header_p) {
+ /* not mapped yet */
+ DEBUG(0,("ERROR shm_free : shmem not mapped\n"));
+ return False;
+ }
+
+ *bytes_free = shm_header_p->statistics.cells_free * CellSize;
+ *bytes_used = shm_header_p->statistics.cells_used * CellSize;
+ *bytes_overhead = shm_header_p->statistics.cells_system * CellSize + AlignedHeaderSize;
+
+ return True;
+}
+
+static struct shmem_ops shmops = {
+ shm_close,
+ shm_alloc,
+ shm_free,
+ shm_get_userdef_off,
+ shm_offset2addr,
+ shm_addr2offset,
+ shm_lock_hash_entry,
+ shm_unlock_hash_entry,
+ shm_get_usage,
+};
+
+/*******************************************************************
+ open the shared memory
+ ******************************************************************/
+struct shmem_ops *sysv_shm_open(int size, int ronly)
+{
+ BOOL created_new = False;
+ BOOL other_processes;
+ struct shmid_ds shm_ds;
+ struct semid_ds sem_ds;
+ union semun su;
+ int i;
+
+ read_only = ronly;
+
+ shm_size = size;
+
+ DEBUG(4,("Trying sysv shmem open of size %d\n", size));
+
+ /* first the semaphore */
+ sem_id = semget(SEMAPHORE_KEY, 0, 0);
+ if (sem_id == -1) {
+ if (read_only) return NULL;
+
+ sem_id = semget(SEMAPHORE_KEY, lp_shmem_hash_size()+1,
+ IPC_CREAT | IPC_EXCL | IPC_PERMS);
+
+ if (sem_id == -1) {
+ DEBUG(0,("Can't create or use semaphore %s\n",
+ strerror(errno)));
+ }
+
+ if (sem_id != -1) {
+ su.val = 1;
+ for (i=0;i<lp_shmem_hash_size()+1;i++) {
+ if (semctl(sem_id, i, SETVAL, su) != 0) {
+ DEBUG(1,("Failed to init semaphore %d\n", i));
+ }
+ }
+ }
+ }
+ if (shm_id == -1) {
+ sem_id = semget(SEMAPHORE_KEY, 0, 0);
+ }
+ if (sem_id == -1) {
+ DEBUG(0,("Can't create or use semaphore %s\n",
+ strerror(errno)));
+ return NULL;
+ }
+
+ su.buf = &sem_ds;
+ if (semctl(sem_id, 0, IPC_STAT, su) != 0) {
+ DEBUG(0,("ERROR shm_open : can't IPC_STAT\n"));
+ }
+ hash_size = sem_ds.sem_nsems;
+ if (hash_size != lp_shmem_hash_size()+1) {
+ DEBUG(0,("WARNING: nsems=%d\n", hash_size));
+ }
+
+ if (!global_lock())
+ return NULL;
+
+ /* try to use an existing key */
+ shm_id = shmget(SHMEM_KEY, shm_size, 0);
+
+ /* if that failed then create one */
+ if (shm_id == -1) {
+ if (read_only) return NULL;
+ shm_id = shmget(SHMEM_KEY, shm_size, IPC_CREAT | IPC_EXCL);
+ created_new = (shm_id != -1);
+ }
+
+ if (shm_id == -1) {
+ DEBUG(0,("Can't create or use IPC area\n"));
+ global_unlock();
+ return NULL;
+ }
+
+
+ shm_header_p = (struct ShmHeader *)shmat(shm_id, 0,
+ read_only?SHM_RDONLY:0);
+ if ((int)shm_header_p == -1) {
+ DEBUG(0,("Can't attach to IPC area\n"));
+ global_unlock();
+ return NULL;
+ }
+
+ /* to find out if some other process is already mapping the file,
+ we use a registration file containing the processids of the file
+ mapping processes */
+ if (shmctl(shm_id, IPC_STAT, &shm_ds) != 0) {
+ DEBUG(0,("ERROR shm_open : can't IPC_STAT\n"));
+ }
+
+ /* set the permissions */
+ if (!read_only) {
+ shm_ds.shm_perm.mode = IPC_PERMS;
+ shmctl(shm_id, IPC_SET, &shm_ds);
+ }
+
+ other_processes = (shm_ds.shm_nattch > 1);
+
+ if (!read_only && !other_processes) {
+ memset((char *)shm_header_p, 0, shm_size);
+ shm_initialize(shm_size);
+ shm_create_hash_table(lp_shmem_hash_size());
+ DEBUG(1,("Initialised IPC area of size %d\n", shm_size));
+ } else if (!shm_validate_header(shm_size)) {
+ /* existing file is corrupt, samba admin should remove
+ it by hand */
+ DEBUG(0,("ERROR shm_open : corrupt IPC area - remove it!\n"));
+ global_unlock();
+ return NULL;
+ }
+
+ global_unlock();
+ return &shmops;
+}
+
+
+
+#else
+ int ipc_dummy_procedure(void)
+{return 0;}
+#endif
git.samba.org / samba.git / commitdiff