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#include <stdio.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)
{
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;
}
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