#include <stdio.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <string.h>
#include <stdlib.h>
-#include <unistd.h>
-#include <time.h>
-#include "libc.h"
#include "syscall.h"
-#include "atomic.h"
#define MAXTRIES 100
-char *tmpnam(char *s)
+char *tmpnam(char *buf)
{
- static int index;
- static char s2[L_tmpnam];
- struct timespec ts;
- int try = 0;
- unsigned n;
-
- if (!s) s = s2;
-
- if (__syscall(SYS_access, P_tmpdir, R_OK|W_OK|X_OK) != 0)
- return NULL;
-
- do {
- __syscall(SYS_clock_gettime, CLOCK_REALTIME, &ts, 0);
- n = ts.tv_nsec ^ (unsigned)&s ^ (unsigned)s;
- snprintf(s, L_tmpnam, "/tmp/t%x-%x", a_fetch_add(&index, 1), n);
- } while (!__syscall(SYS_access, s, F_OK) && try++<MAXTRIES);
- return try==MAXTRIES ? 0 : s;
+ static char internal[L_tmpnam];
+ char s[] = "/tmp/tmpnam_XXXXXX";
+ int try;
+ int r;
+ for (try=0; try<MAXTRIES; try++) {
+ __randname(s+12);
+#ifdef SYS_readlink
+ r = __syscall(SYS_readlink, s, (char[1]){0}, 1);
+#else
+ r = __syscall(SYS_readlinkat, AT_FDCWD, s, (char[1]){0}, 1);
+#endif
+ if (r == -ENOENT) return strcpy(buf ? buf : internal, s);
+ }
+ return 0;
}