blob: dc4f2bad0d14d90df5498dfdad1cbee7a0a123fb (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include "libc.h"
#include "atomic.h"
#define MAXTRIES 100
char *tempnam(const char *dir, const char *pfx)
{
static int index;
char *s;
struct timespec ts;
int pid = getpid();
size_t l;
int n;
int try=0;
if (!dir) dir = P_tmpdir;
if (!pfx) pfx = "temp";
if (access(dir, R_OK|W_OK|X_OK) != 0)
return NULL;
l = strlen(dir) + 1 + strlen(pfx) + 3*(sizeof(int)*3+2) + 1;
s = malloc(l);
if (!s) return s;
do {
clock_gettime(CLOCK_REALTIME, &ts);
n = ts.tv_nsec ^ (unsigned)&s ^ (unsigned)s;
snprintf(s, l, "%s/%s-%d-%d-%x", dir, pfx, pid, a_fetch_add(&index, 1), n);
} while (!access(s, F_OK) && try++<MAXTRIES);
if (try>=MAXTRIES) {
free(s);
return 0;
}
return s;
}
|
