splice/sendfile1: why doesn't this work? EINVAL...

[metze/misc/junkcode.git] / splice / sendfile1.c

diff --git a/splice/sendfile1.c b/splice/sendfile1.c
new file mode 100644 (file)
index 0000000..9910614
--- /dev/null
+++ b/splice/sendfile1.c
@@ -0,0 +1,61 @@
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/uio.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <stdint.h>
+#include <sys/socket.h>
+#include <sys/sendfile.h>
+
+int main(int argc, const char * const *argv)
+{
+       ssize_t ret;
+       int pfd[2];
+       int rc;
+       void *ptr;
+       struct iovec iov[2];
+
+       static const uint8_t buf[0x2000];
+
+       int zfd = open("/dev/zero", O_RDWR);
+       loff_t zofs = 5;
+       size_t zlen = 0x20000;
+       int nfd = open("/dev/null", O_WRONLY);
+       loff_t nofs = 5;
+       size_t nlen = 0x200;
+       int i;
+       int sfd[2];
+       rc = socketpair(PF_UNIX, SOCK_STREAM, 0, sfd);
+
+       rc = pipe(pfd);
+
+#if 0
+       errno = 0;
+       ret = write(pfd[1], buf, sizeof(buf));
+       printf("%d: ret[%lld] errno[%d/%s]\n", __LINE__,
+               (long long int)ret, errno, strerror(errno));
+#endif
+
+for (i=0; i < 0x10000; i++) {
+       off_t ofs = 0;
+
+       errno = 0;
+       ret = sendfile(sfd[1], zfd, NULL/*&ofs*/, nlen);
+       if (ret < 0) {
+               printf("%d: ret[%lld] errno[%d/%s]\n", __LINE__,
+                       (long long int)ret, errno, strerror(errno));
+               break;
+       }
+}
+#if 0
+       errno = 0;
+       ret = splice(pfd[0], NULL, nfd, &nofs, nlen, SPLICE_F_MOVE|SPLICE_F_NONBLOCK);
+       printf("%d: ret[%lld] errno[%d/%s]\n", __LINE__,
+               (long long int)ret, errno, strerror(errno));
+#endif
+
+       return 0;
+}