#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
#include <fcntl.h>
-#include <unistd.h>
-#include <limits.h>
#include <errno.h>
-#include "libc.h"
+#include <sys/stat.h>
+#include <limits.h>
+#include <string.h>
+#include <stdlib.h>
+#include "syscall.h"
+
+#define MAXTRIES 100
char *tempnam(const char *dir, const char *pfx)
{
- static int lock;
- static int index;
- char *s;
- int pid = getpid();
- int l;
+ char s[PATH_MAX];
+ size_t l, dl, pl;
+ int try;
+ int r;
if (!dir) dir = P_tmpdir;
if (!pfx) pfx = "temp";
- if (access(dir, R_OK|W_OK|X_OK) != 0)
- return NULL;
+ dl = strlen(dir);
+ pl = strlen(pfx);
+ l = dl + 1 + pl + 1 + 6;
- l = strlen(dir) + 1 + strlen(pfx) + 2 + sizeof(int)*3*2 + 1;
- s = malloc(l);
- if (!s) {
- errno = ENOMEM;
- return NULL;
+ if (l >= PATH_MAX) {
+ errno = ENAMETOOLONG;
+ return 0;
}
- LOCK(&lock);
- for (; index < TMP_MAX; index++) {
- snprintf(s, l, "%s/%s-%d-%d", dir, pfx, pid, index);
- if (access(s, F_OK) != 0) {
- UNLOCK(&lock);
- return s;
- }
+ memcpy(s, dir, dl);
+ s[dl] = '/';
+ memcpy(s+dl+1, pfx, pl);
+ s[dl+1+pl] = '_';
+ s[l] = 0;
+
+ for (try=0; try<MAXTRIES; try++) {
+ __randname(s+l-6);
+#ifdef SYS_lstat
+ r = __syscall(SYS_lstat, s, &(struct stat){0});
+#else
+ r = __syscall(SYS_fstatat, AT_FDCWD, s,
+ &(struct stat){0}, AT_SYMLINK_NOFOLLOW);
+#endif
+ if (r == -ENOENT) return strdup(s);
}
- UNLOCK(&lock);
- free(s);
- return NULL;
+ return 0;
}