diff options
Diffstat (limited to 'src/temp/mktemp.c')
| -rw-r--r-- | src/temp/mktemp.c | 28 |
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); |