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-rw-r--r--src/temp/mktemp.c28
1 files changed, 15 insertions, 13 deletions
diff --git a/src/temp/mktemp.c b/src/temp/mktemp.c
index 1078b9df..1462a16c 100644
--- a/src/temp/mktemp.c
+++ b/src/temp/mktemp.c
@@ -4,28 +4,30 @@
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
+#include <time.h>
+#include <stdint.h>
#include "libc.h"
char *__mktemp(char *template)
{
- static int lock;
- static int index;
- int l = strlen(template);
+ struct timespec ts;
+ size_t l = strlen(template);
+ int retries = 10000;
+ unsigned long r;
if (l < 6 || strcmp(template+l-6, "XXXXXX")) {
errno = EINVAL;
- return NULL;
+ return 0;
}
- LOCK(&lock);
- for (; index < 1000000; index++) {
- snprintf(template+l-6, 6, "%06d", index);
- if (access(template, F_OK) != 0) {
- UNLOCK(&lock);
- return template;
- }
+ clock_gettime(CLOCK_REALTIME, &ts);
+ r = ts.tv_nsec + (uintptr_t)&ts / 16 + (uintptr_t)template;
+ while (retries--) {
+ snprintf(template+l-6, 7, "%06lX", r & 0xffffff);
+ if (access(template, F_OK) < 0) return template;
+ r = r * 1103515245 + 12345;
}
- UNLOCK(&lock);
- return NULL;
+ errno = EEXIST;
+ return 0;
}
weak_alias(__mktemp, mktemp);