src/stdio/tmpnam.c

   1 #include <stdio.h>
   2 #include <fcntl.h>
   3 #include <errno.h>
   4 #include <sys/stat.h>
   5 #include <string.h>
   6 #include <stdlib.h>
   7 #include "syscall.h"
   8
   9 #define MAXTRIES 100
  10
  11 char *tmpnam(char *buf)
  12 {
  13         static char internal[L_tmpnam];
  14         char s[] = "/tmp/tmpnam_XXXXXX";
  15         int try;
  16         int r;
  17         for (try=0; try<MAXTRIES; try++) {
  18                 __randname(s+12);
  19 #ifdef SYS_lstat
  20                 r = __syscall(SYS_lstat, s, &(struct stat){0});
  21 #else
  22                 r = __syscall(SYS_fstatat, AT_FDCWD, s,
  23                         &(struct stat){0}, AT_SYMLINK_NOFOLLOW);
  24 #endif
  25                 if (r == -ENOENT) return strcpy(buf ? buf : internal, s);
  26         }
  27         return 0;
  28 }