2 Unix SMB/CIFS implementation.
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Jeremy Allison 1998-2005
6 Copyright (C) Timur Bakeyev 2005
7 Copyright (C) Bjoern Jacke 2006-2007
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 #include "system/syslog.h"
25 #include "system/capability.h"
26 #include "system/passwd.h"
27 #include "system/filesys.h"
28 #include "../lib/util/setid.h"
30 #ifdef HAVE_SYS_SYSCTL_H
31 #include <sys/sysctl.h>
34 #ifdef HAVE_SYS_PRCTL_H
35 #include <sys/prctl.h>
39 The idea is that this file will eventually have wrappers around all
40 important system calls in samba. The aims are:
42 - to enable easier porting by putting OS dependent stuff in here
44 - to allow for hooks into other "pseudo-filesystems"
46 - to allow easier integration of things like the japanese extensions
48 - to support the philosophy of Samba to expose the features of
49 the OS within the SMB model. In general whatever file/printer/variable
50 expansions/etc make sense to the OS should be acceptable to Samba.
53 /*******************************************************************
54 A send wrapper that will deal with EINTR or EAGAIN or EWOULDBLOCK.
55 ********************************************************************/
57 ssize_t sys_send(int s, const void *msg, size_t len, int flags)
62 ret = send(s, msg, len, flags);
63 } while (ret == -1 && (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
68 /*******************************************************************
69 A recvfrom wrapper that will deal with EINTR.
70 NB. As used with non-blocking sockets, return on EAGAIN/EWOULDBLOCK
71 ********************************************************************/
73 ssize_t sys_recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen)
78 ret = recvfrom(s, buf, len, flags, from, fromlen);
79 } while (ret == -1 && (errno == EINTR));
83 /*******************************************************************
84 A fcntl wrapper that will deal with EINTR.
85 ********************************************************************/
87 int sys_fcntl_ptr(int fd, int cmd, void *arg)
92 ret = fcntl(fd, cmd, arg);
93 } while (ret == -1 && errno == EINTR);
97 /*******************************************************************
98 A fcntl wrapper that will deal with EINTR.
99 ********************************************************************/
101 int sys_fcntl_long(int fd, int cmd, long arg)
106 ret = fcntl(fd, cmd, arg);
107 } while (ret == -1 && errno == EINTR);
111 /****************************************************************************
112 Get/Set all the possible time fields from a stat struct as a timespec.
113 ****************************************************************************/
115 static struct timespec get_atimespec(const struct stat *pst)
117 #if !defined(HAVE_STAT_HIRES_TIMESTAMPS)
120 /* Old system - no ns timestamp. */
121 ret.tv_sec = pst->st_atime;
125 #if defined(HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC)
127 ret.tv_sec = pst->st_atim.tv_sec;
128 ret.tv_nsec = pst->st_atim.tv_nsec;
130 #elif defined(HAVE_STRUCT_STAT_ST_MTIMENSEC)
132 ret.tv_sec = pst->st_atime;
133 ret.tv_nsec = pst->st_atimensec;
135 #elif defined(HAVE_STRUCT_STAT_ST_MTIME_N)
137 ret.tv_sec = pst->st_atime;
138 ret.tv_nsec = pst->st_atime_n;
140 #elif defined(HAVE_STRUCT_STAT_ST_UMTIME)
142 ret.tv_sec = pst->st_atime;
143 ret.tv_nsec = pst->st_uatime * 1000;
145 #elif defined(HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC)
146 return pst->st_atimespec;
148 #error CONFIGURE_ERROR_IN_DETECTING_TIMESPEC_IN_STAT
153 static struct timespec get_mtimespec(const struct stat *pst)
155 #if !defined(HAVE_STAT_HIRES_TIMESTAMPS)
158 /* Old system - no ns timestamp. */
159 ret.tv_sec = pst->st_mtime;
163 #if defined(HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC)
165 ret.tv_sec = pst->st_mtim.tv_sec;
166 ret.tv_nsec = pst->st_mtim.tv_nsec;
168 #elif defined(HAVE_STRUCT_STAT_ST_MTIMENSEC)
170 ret.tv_sec = pst->st_mtime;
171 ret.tv_nsec = pst->st_mtimensec;
173 #elif defined(HAVE_STRUCT_STAT_ST_MTIME_N)
175 ret.tv_sec = pst->st_mtime;
176 ret.tv_nsec = pst->st_mtime_n;
178 #elif defined(HAVE_STRUCT_STAT_ST_UMTIME)
180 ret.tv_sec = pst->st_mtime;
181 ret.tv_nsec = pst->st_umtime * 1000;
183 #elif defined(HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC)
184 return pst->st_mtimespec;
186 #error CONFIGURE_ERROR_IN_DETECTING_TIMESPEC_IN_STAT
191 static struct timespec get_ctimespec(const struct stat *pst)
193 #if !defined(HAVE_STAT_HIRES_TIMESTAMPS)
196 /* Old system - no ns timestamp. */
197 ret.tv_sec = pst->st_ctime;
201 #if defined(HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC)
203 ret.tv_sec = pst->st_ctim.tv_sec;
204 ret.tv_nsec = pst->st_ctim.tv_nsec;
206 #elif defined(HAVE_STRUCT_STAT_ST_MTIMENSEC)
208 ret.tv_sec = pst->st_ctime;
209 ret.tv_nsec = pst->st_ctimensec;
211 #elif defined(HAVE_STRUCT_STAT_ST_MTIME_N)
213 ret.tv_sec = pst->st_ctime;
214 ret.tv_nsec = pst->st_ctime_n;
216 #elif defined(HAVE_STRUCT_STAT_ST_UMTIME)
218 ret.tv_sec = pst->st_ctime;
219 ret.tv_nsec = pst->st_uctime * 1000;
221 #elif defined(HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC)
222 return pst->st_ctimespec;
224 #error CONFIGURE_ERROR_IN_DETECTING_TIMESPEC_IN_STAT
229 /****************************************************************************
230 Return the best approximation to a 'create time' under UNIX from a stat
232 ****************************************************************************/
234 static struct timespec calc_create_time_stat(const struct stat *st)
236 struct timespec ret, ret1;
237 struct timespec c_time = get_ctimespec(st);
238 struct timespec m_time = get_mtimespec(st);
239 struct timespec a_time = get_atimespec(st);
241 ret = timespec_compare(&c_time, &m_time) < 0 ? c_time : m_time;
242 ret1 = timespec_compare(&ret, &a_time) < 0 ? ret : a_time;
244 if(!null_timespec(ret1)) {
249 * One of ctime, mtime or atime was zero (probably atime).
250 * Just return MIN(ctime, mtime).
255 /****************************************************************************
256 Return the best approximation to a 'create time' under UNIX from a stat_ex
258 ****************************************************************************/
260 static struct timespec calc_create_time_stat_ex(const struct stat_ex *st)
262 struct timespec ret, ret1;
263 struct timespec c_time = st->st_ex_ctime;
264 struct timespec m_time = st->st_ex_mtime;
265 struct timespec a_time = st->st_ex_atime;
267 ret = timespec_compare(&c_time, &m_time) < 0 ? c_time : m_time;
268 ret1 = timespec_compare(&ret, &a_time) < 0 ? ret : a_time;
270 if(!null_timespec(ret1)) {
275 * One of ctime, mtime or atime was zero (probably atime).
276 * Just return MIN(ctime, mtime).
281 /****************************************************************************
282 Return the 'create time' from a stat struct if it exists (birthtime) or else
283 use the best approximation.
284 ****************************************************************************/
286 static void make_create_timespec(const struct stat *pst, struct stat_ex *dst,
287 bool fake_dir_create_times)
289 if (S_ISDIR(pst->st_mode) && fake_dir_create_times) {
290 dst->st_ex_btime.tv_sec = 315493200L; /* 1/1/1980 */
291 dst->st_ex_btime.tv_nsec = 0;
294 dst->st_ex_iflags &= ~ST_EX_IFLAG_CALCULATED_BTIME;
296 #if defined(HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC)
297 dst->st_ex_btime = pst->st_birthtimespec;
298 #elif defined(HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC)
299 dst->st_ex_btime.tv_sec = pst->st_birthtime;
300 dst->st_ex_btime.tv_nsec = pst->st_birthtimenspec;
301 #elif defined(HAVE_STRUCT_STAT_ST_BIRTHTIME)
302 dst->st_ex_btime.tv_sec = pst->st_birthtime;
303 dst->st_ex_btime.tv_nsec = 0;
305 dst->st_ex_btime = calc_create_time_stat(pst);
306 dst->st_ex_iflags |= ST_EX_IFLAG_CALCULATED_BTIME;
309 /* Deal with systems that don't initialize birthtime correctly.
310 * Pointed out by SATOH Fumiyasu <fumiyas@osstech.jp>.
312 if (null_timespec(dst->st_ex_btime)) {
313 dst->st_ex_btime = calc_create_time_stat(pst);
314 dst->st_ex_iflags |= ST_EX_IFLAG_CALCULATED_BTIME;
317 dst->st_ex_itime = dst->st_ex_btime;
318 dst->st_ex_iflags |= ST_EX_IFLAG_CALCULATED_ITIME;
321 /****************************************************************************
322 If we update a timestamp in a stat_ex struct we may have to recalculate
323 the birthtime. For now only implement this for write time, but we may
324 also need to do it for atime and ctime. JRA.
325 ****************************************************************************/
327 void update_stat_ex_mtime(struct stat_ex *dst,
328 struct timespec write_ts)
330 dst->st_ex_mtime = write_ts;
332 /* We may have to recalculate btime. */
333 if (dst->st_ex_iflags & ST_EX_IFLAG_CALCULATED_BTIME) {
334 dst->st_ex_btime = calc_create_time_stat_ex(dst);
338 void update_stat_ex_create_time(struct stat_ex *dst,
339 struct timespec create_time)
341 dst->st_ex_btime = create_time;
342 dst->st_ex_iflags &= ~ST_EX_IFLAG_CALCULATED_BTIME;
345 void update_stat_ex_itime(struct stat_ex *dst,
346 struct timespec itime)
348 dst->st_ex_itime = itime;
349 dst->st_ex_iflags &= ~ST_EX_IFLAG_CALCULATED_ITIME;
352 void init_stat_ex_from_stat (struct stat_ex *dst,
353 const struct stat *src,
354 bool fake_dir_create_times)
356 dst->st_ex_dev = src->st_dev;
357 dst->st_ex_ino = src->st_ino;
358 dst->st_ex_mode = src->st_mode;
359 dst->st_ex_nlink = src->st_nlink;
360 dst->st_ex_uid = src->st_uid;
361 dst->st_ex_gid = src->st_gid;
362 dst->st_ex_rdev = src->st_rdev;
363 dst->st_ex_size = src->st_size;
364 dst->st_ex_atime = get_atimespec(src);
365 dst->st_ex_mtime = get_mtimespec(src);
366 dst->st_ex_ctime = get_ctimespec(src);
367 dst->st_ex_iflags = 0;
368 make_create_timespec(src, dst, fake_dir_create_times);
369 #ifdef HAVE_STAT_ST_BLKSIZE
370 dst->st_ex_blksize = src->st_blksize;
372 dst->st_ex_blksize = STAT_ST_BLOCKSIZE;
375 #ifdef HAVE_STAT_ST_BLOCKS
376 dst->st_ex_blocks = src->st_blocks;
378 dst->st_ex_blocks = src->st_size / dst->st_ex_blksize + 1;
381 #ifdef HAVE_STAT_ST_FLAGS
382 dst->st_ex_flags = src->st_flags;
384 dst->st_ex_flags = 0;
386 dst->st_ex_file_id = dst->st_ex_ino;
387 dst->st_ex_iflags |= ST_EX_IFLAG_CALCULATED_FILE_ID;
390 /*******************************************************************
392 ********************************************************************/
394 int sys_stat(const char *fname, SMB_STRUCT_STAT *sbuf,
395 bool fake_dir_create_times)
399 ret = stat(fname, &statbuf);
401 /* we always want directories to appear zero size */
402 if (S_ISDIR(statbuf.st_mode)) {
405 init_stat_ex_from_stat(sbuf, &statbuf, fake_dir_create_times);
410 /*******************************************************************
412 ********************************************************************/
414 int sys_fstat(int fd, SMB_STRUCT_STAT *sbuf, bool fake_dir_create_times)
418 ret = fstat(fd, &statbuf);
420 /* we always want directories to appear zero size */
421 if (S_ISDIR(statbuf.st_mode)) {
424 init_stat_ex_from_stat(sbuf, &statbuf, fake_dir_create_times);
429 /*******************************************************************
431 ********************************************************************/
433 int sys_lstat(const char *fname,SMB_STRUCT_STAT *sbuf,
434 bool fake_dir_create_times)
438 ret = lstat(fname, &statbuf);
440 /* we always want directories to appear zero size */
441 if (S_ISDIR(statbuf.st_mode)) {
444 init_stat_ex_from_stat(sbuf, &statbuf, fake_dir_create_times);
449 /*******************************************************************
450 An posix_fallocate() wrapper.
451 ********************************************************************/
452 int sys_posix_fallocate(int fd, off_t offset, off_t len)
454 #if defined(HAVE_POSIX_FALLOCATE)
455 return posix_fallocate(fd, offset, len);
456 #elif defined(F_RESVSP64)
457 /* this handles XFS on IRIX */
459 off_t new_len = offset + len;
463 /* unlikely to get a too large file on a 64bit system but ... */
467 fl.l_whence = SEEK_SET;
471 ret=fcntl(fd, F_RESVSP64, &fl);
476 /* Make sure the file gets enlarged after we allocated space: */
478 if (new_len > sbuf.st_size)
479 ftruncate64(fd, new_len);
486 /*******************************************************************
487 An fallocate() function that matches the semantics of the Linux one.
488 ********************************************************************/
490 #ifdef HAVE_LINUX_FALLOC_H
491 #include <linux/falloc.h>
494 int sys_fallocate(int fd, uint32_t mode, off_t offset, off_t len)
496 #if defined(HAVE_LINUX_FALLOCATE)
499 if (mode & VFS_FALLOCATE_FL_KEEP_SIZE) {
500 lmode |= FALLOC_FL_KEEP_SIZE;
501 mode &= ~VFS_FALLOCATE_FL_KEEP_SIZE;
504 #if defined(HAVE_FALLOC_FL_PUNCH_HOLE)
505 if (mode & VFS_FALLOCATE_FL_PUNCH_HOLE) {
506 lmode |= FALLOC_FL_PUNCH_HOLE;
507 mode &= ~VFS_FALLOCATE_FL_PUNCH_HOLE;
509 #endif /* HAVE_FALLOC_FL_PUNCH_HOLE */
512 DEBUG(2, ("unmapped fallocate flags: %lx\n",
513 (unsigned long)mode));
517 return fallocate(fd, lmode, offset, len);
518 #else /* HAVE_LINUX_FALLOCATE */
519 /* TODO - plumb in fallocate from other filesysetms like VXFS etc. JRA. */
522 #endif /* HAVE_LINUX_FALLOCATE */
525 #ifdef HAVE_KERNEL_SHARE_MODES
527 #define LOCK_MAND 32 /* This is a mandatory flock */
528 #define LOCK_READ 64 /* ... Which allows concurrent read operations */
529 #define LOCK_WRITE 128 /* ... Which allows concurrent write operations */
530 #define LOCK_RW 192 /* ... Which allows concurrent read & write ops */
534 /*******************************************************************
535 A flock() wrapper that will perform the kernel flock.
536 ********************************************************************/
538 void kernel_flock(int fd, uint32_t share_mode, uint32_t access_mask)
540 #ifdef HAVE_KERNEL_SHARE_MODES
542 if (share_mode == FILE_SHARE_WRITE) {
543 kernel_mode = LOCK_MAND|LOCK_WRITE;
544 } else if (share_mode == FILE_SHARE_READ) {
545 kernel_mode = LOCK_MAND|LOCK_READ;
546 } else if (share_mode == FILE_SHARE_NONE) {
547 kernel_mode = LOCK_MAND;
550 flock(fd, kernel_mode);
558 /*******************************************************************
559 An fdopendir wrapper.
560 ********************************************************************/
562 DIR *sys_fdopendir(int fd)
564 #if defined(HAVE_FDOPENDIR)
565 return fdopendir(fd);
572 /*******************************************************************
574 ********************************************************************/
576 int sys_mknod(const char *path, mode_t mode, SMB_DEV_T dev)
578 #if defined(HAVE_MKNOD)
579 return mknod(path, mode, dev);
581 /* No mknod system call. */
587 /*******************************************************************
588 System wrapper for getwd. Always returns MALLOC'ed memory, or NULL
589 on error (malloc fail usually).
590 ********************************************************************/
592 char *sys_getwd(void)
594 #ifdef GETCWD_TAKES_NULL
595 return getcwd(NULL, 0);
596 #elif defined(HAVE_GETCWD)
597 char *wd = NULL, *s = NULL;
598 size_t allocated = PATH_MAX;
601 s = SMB_REALLOC_ARRAY(s, char, allocated);
605 wd = getcwd(s, allocated);
609 if (errno != ERANGE) {
610 int saved_errno = errno;
616 if (allocated < PATH_MAX) {
624 char *s = SMB_MALLOC_ARRAY(char, PATH_MAX);
630 int saved_errno = errno;
638 #if defined(HAVE_POSIX_CAPABILITIES)
640 /**************************************************************************
641 Try and abstract process capabilities (for systems that have them).
642 ****************************************************************************/
644 /* Set the POSIX capabilities needed for the given purpose into the effective
645 * capability set of the current process. Make sure they are always removed
646 * from the inheritable set, because there is no circumstance in which our
647 * children should inherit our elevated privileges.
649 static bool set_process_capability(enum smbd_capability capability,
652 cap_value_t cap_vals[2] = {0};
653 int num_cap_vals = 0;
657 #if defined(HAVE_PRCTL) && defined(PR_GET_KEEPCAPS) && defined(PR_SET_KEEPCAPS)
658 /* On Linux, make sure that any capabilities we grab are sticky
659 * across UID changes. We expect that this would allow us to keep both
660 * the effective and permitted capability sets, but as of circa 2.6.16,
661 * only the permitted set is kept. It is a bug (which we work around)
662 * that the effective set is lost, but we still require the effective
665 if (!prctl(PR_GET_KEEPCAPS)) {
666 prctl(PR_SET_KEEPCAPS, 1);
670 cap = cap_get_proc();
672 DEBUG(0,("set_process_capability: cap_get_proc failed: %s\n",
677 switch (capability) {
678 case KERNEL_OPLOCK_CAPABILITY:
679 #ifdef CAP_NETWORK_MGT
680 /* IRIX has CAP_NETWORK_MGT for oplocks. */
681 cap_vals[num_cap_vals++] = CAP_NETWORK_MGT;
684 case DMAPI_ACCESS_CAPABILITY:
685 #ifdef CAP_DEVICE_MGT
686 /* IRIX has CAP_DEVICE_MGT for DMAPI access. */
687 cap_vals[num_cap_vals++] = CAP_DEVICE_MGT;
689 /* Linux has CAP_MKNOD for DMAPI access. */
690 cap_vals[num_cap_vals++] = CAP_MKNOD;
693 case LEASE_CAPABILITY:
695 cap_vals[num_cap_vals++] = CAP_LEASE;
698 case DAC_OVERRIDE_CAPABILITY:
699 #ifdef CAP_DAC_OVERRIDE
700 cap_vals[num_cap_vals++] = CAP_DAC_OVERRIDE;
704 SMB_ASSERT(num_cap_vals <= ARRAY_SIZE(cap_vals));
706 if (num_cap_vals == 0) {
711 cap_set_flag(cap, CAP_EFFECTIVE, num_cap_vals, cap_vals,
712 enable ? CAP_SET : CAP_CLEAR);
714 /* We never want to pass capabilities down to our children, so make
715 * sure they are not inherited.
717 cap_set_flag(cap, CAP_INHERITABLE, num_cap_vals, cap_vals, CAP_CLEAR);
719 if (cap_set_proc(cap) == -1) {
720 DEBUG(0, ("set_process_capability: cap_set_proc failed: %s\n",
730 #endif /* HAVE_POSIX_CAPABILITIES */
732 /****************************************************************************
733 Gain the oplock capability from the kernel if possible.
734 ****************************************************************************/
736 void set_effective_capability(enum smbd_capability capability)
738 #if defined(HAVE_POSIX_CAPABILITIES)
739 set_process_capability(capability, True);
740 #endif /* HAVE_POSIX_CAPABILITIES */
743 void drop_effective_capability(enum smbd_capability capability)
745 #if defined(HAVE_POSIX_CAPABILITIES)
746 set_process_capability(capability, False);
747 #endif /* HAVE_POSIX_CAPABILITIES */
750 /**************************************************************************
751 Wrapper for random().
752 ****************************************************************************/
754 long sys_random(void)
756 #if defined(HAVE_RANDOM)
757 return (long)random();
758 #elif defined(HAVE_RAND)
761 DEBUG(0,("Error - no random function available !\n"));
766 /**************************************************************************
767 Wrapper for srandom().
768 ****************************************************************************/
770 void sys_srandom(unsigned int seed)
772 #if defined(HAVE_SRANDOM)
774 #elif defined(HAVE_SRAND)
777 DEBUG(0,("Error - no srandom function available !\n"));
783 #define NGROUPS_MAX 32 /* Guess... */
786 /**************************************************************************
787 Returns equivalent to NGROUPS_MAX - using sysconf if needed.
788 ****************************************************************************/
792 #if defined(SYSCONF_SC_NGROUPS_MAX)
793 int ret = sysconf(_SC_NGROUPS_MAX);
794 return (ret == -1) ? NGROUPS_MAX : ret;
800 /**************************************************************************
801 Wrap setgroups and getgroups for systems that declare getgroups() as
802 returning an array of gid_t, but actuall return an array of int.
803 ****************************************************************************/
805 #if defined(HAVE_BROKEN_GETGROUPS)
807 #ifdef HAVE_BROKEN_GETGROUPS
813 static int sys_broken_getgroups(int setlen, gid_t *gidset)
819 return getgroups(0, NULL);
823 * Broken case. We need to allocate a
824 * GID_T array of size setlen.
832 if((group_list = SMB_MALLOC_ARRAY(GID_T, setlen)) == NULL) {
833 DEBUG(0,("sys_getgroups: Malloc fail.\n"));
837 if((ngroups = getgroups(setlen, group_list)) < 0) {
838 int saved_errno = errno;
839 SAFE_FREE(group_list);
845 * We're safe here as if ngroups > setlen then
846 * getgroups *must* return EINVAL.
847 * pubs.opengroup.org/onlinepubs/009695399/functions/getgroups.html
850 for(i = 0; i < ngroups; i++)
851 gidset[i] = (gid_t)group_list[i];
853 SAFE_FREE(group_list);
857 static int sys_broken_setgroups(int setlen, gid_t *gidset)
865 if (setlen < 0 || setlen > groups_max()) {
871 * Broken case. We need to allocate a
872 * GID_T array of size setlen.
875 if((group_list = SMB_MALLOC_ARRAY(GID_T, setlen)) == NULL) {
876 DEBUG(0,("sys_setgroups: Malloc fail.\n"));
880 for(i = 0; i < setlen; i++)
881 group_list[i] = (GID_T) gidset[i];
883 if(samba_setgroups(setlen, group_list) != 0) {
884 int saved_errno = errno;
885 SAFE_FREE(group_list);
890 SAFE_FREE(group_list);
894 #endif /* HAVE_BROKEN_GETGROUPS */
896 /* This is a list of systems that require the first GID passed to setgroups(2)
897 * to be the effective GID. If your system is one of these, add it here.
899 #if defined (FREEBSD) || defined (DARWINOS)
900 #define USE_BSD_SETGROUPS
903 #if defined(USE_BSD_SETGROUPS)
904 /* Depending on the particular BSD implementation, the first GID that is
905 * passed to setgroups(2) will either be ignored or will set the credential's
906 * effective GID. In either case, the right thing to do is to guarantee that
907 * gidset[0] is the effective GID.
909 static int sys_bsd_setgroups(gid_t primary_gid, int setlen, const gid_t *gidset)
911 gid_t *new_gidset = NULL;
915 /* setgroups(2) will fail with EINVAL if we pass too many groups. */
918 /* No group list, just make sure we are setting the efective GID. */
920 return samba_setgroups(1, &primary_gid);
923 /* If the primary gid is not the first array element, grow the array
924 * and insert it at the front.
926 if (gidset[0] != primary_gid) {
927 new_gidset = SMB_MALLOC_ARRAY(gid_t, setlen + 1);
928 if (new_gidset == NULL) {
932 memcpy(new_gidset + 1, gidset, (setlen * sizeof(gid_t)));
933 new_gidset[0] = primary_gid;
938 DEBUG(3, ("forced to truncate group list from %d to %d\n",
943 #if defined(HAVE_BROKEN_GETGROUPS)
944 ret = sys_broken_setgroups(setlen, new_gidset ? new_gidset : gidset);
946 ret = samba_setgroups(setlen, new_gidset ? new_gidset : gidset);
951 SAFE_FREE(new_gidset);
958 #endif /* USE_BSD_SETGROUPS */
960 /**************************************************************************
961 Wrapper for getgroups. Deals with broken (int) case.
962 ****************************************************************************/
964 int sys_getgroups(int setlen, gid_t *gidset)
966 #if defined(HAVE_BROKEN_GETGROUPS)
967 return sys_broken_getgroups(setlen, gidset);
969 return getgroups(setlen, gidset);
973 /**************************************************************************
974 Wrapper for setgroups. Deals with broken (int) case and BSD case.
975 ****************************************************************************/
977 int sys_setgroups(gid_t UNUSED(primary_gid), int setlen, gid_t *gidset)
979 #if !defined(HAVE_SETGROUPS)
982 #endif /* HAVE_SETGROUPS */
984 #if defined(USE_BSD_SETGROUPS)
985 return sys_bsd_setgroups(primary_gid, setlen, gidset);
986 #elif defined(HAVE_BROKEN_GETGROUPS)
987 return sys_broken_setgroups(setlen, gidset);
989 return samba_setgroups(setlen, gidset);
993 /****************************************************************************
994 Return the major devicenumber for UNIX extensions.
995 ****************************************************************************/
997 uint32_t unix_dev_major(SMB_DEV_T dev)
999 #if defined(HAVE_DEVICE_MAJOR_FN)
1000 return (uint32_t)major(dev);
1002 return (uint32_t)(dev >> 8);
1006 /****************************************************************************
1007 Return the minor devicenumber for UNIX extensions.
1008 ****************************************************************************/
1010 uint32_t unix_dev_minor(SMB_DEV_T dev)
1012 #if defined(HAVE_DEVICE_MINOR_FN)
1013 return (uint32_t)minor(dev);
1015 return (uint32_t)(dev & 0xff);
1019 /**************************************************************************
1020 Wrapper for realpath.
1021 ****************************************************************************/
1023 char *sys_realpath(const char *path)
1027 #ifdef REALPATH_TAKES_NULL
1028 result = realpath(path, NULL);
1030 result = SMB_MALLOC_ARRAY(char, PATH_MAX + 1);
1032 char *resolved_path = realpath(path, result);
1033 if (!resolved_path) {
1036 /* SMB_ASSERT(result == resolved_path) ? */
1037 result = resolved_path;
1045 /*******************************************************************
1046 Return the number of CPUs.
1047 ********************************************************************/
1049 int sys_get_number_of_cores(void)
1053 #if defined(HAVE_SYSCONF)
1054 #if defined(_SC_NPROCESSORS_ONLN)
1055 ret = (int)sysconf(_SC_NPROCESSORS_ONLN);
1057 #if defined(_SC_NPROCESSORS_CONF)
1059 ret = (int)sysconf(_SC_NPROCESSORS_CONF);
1062 #elif defined(HAVE_SYSCTL) && defined(CTL_HW)
1064 unsigned int len = sizeof(ret);
1067 #if defined(HW_AVAILCPU)
1068 name[1] = HW_AVAILCPU;
1070 if (sysctl(name, 2, &ret, &len, NULL, 0) == -1) {
1074 #if defined(HW_NCPU)
1078 if (sysctl(nm, 2, &count, &len, NULL, 0) == -1) {