#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
/* backward compat in case it's not defined */
#ifndef O_TMPFILE
#define O_TMPFILE (020000000|O_DIRECTORY)
#endif
/*
* DESCRIPTION:
* Verify O_EXCL tmpfile cannot be linked.
*
* STRATEGY:
* 1. open(2) with O_TMPFILE|O_EXCL.
* 2. linkat(2).
* 3. stat(2) the path to verify it wasn't created.
*
*/
int
main(int argc, char *argv[])
{
int i, fd;
char spath[1024], dpath[1024];
char *penv[] = {"TESTDIR", "TESTFILE0"};
struct stat sbuf;
(void) fprintf(stdout, "Verify O_EXCL tmpfile cannot be linked.\n");
/*
* Get the environment variable values.
*/
for (i = 0; i < sizeof (penv) / sizeof (char *); i++) {
if ((penv[i] = getenv(penv[i])) == NULL) {
(void) fprintf(stderr, "getenv(penv[%d])\n", i);
exit(1);
}
}
fd = open(penv[0], O_RDWR|O_TMPFILE|O_EXCL, 0666);
if (fd < 0) {
perror("open");
exit(2);
}
snprintf(spath, 1024, "/proc/self/fd/%d", fd);
snprintf(dpath, 1024, "%s/%s", penv[0], penv[1]);
if (linkat(AT_FDCWD, spath, AT_FDCWD, dpath, AT_SYMLINK_FOLLOW) == 0) {
fprintf(stderr, "linkat returns successfully\n");
close(fd);
exit(3);
}
if (stat(dpath, &sbuf) == 0) {
fprintf(stderr, "stat returns successfully\n");
close(fd);
exit(4);
}
close(fd);
return (0);
}
