src/stdio/tmpfile.c

   1 #include <stdio.h>
   2 #include <fcntl.h>
   3 #include <stdlib.h>
   4 #include "stdio_impl.h"
   5
   6 #define MAXTRIES 100
   7
   8 FILE *tmpfile(void)
   9 {
  10         char s[] = "/tmp/tmpfile_XXXXXX";
  11         int fd;
  12         FILE *f;
  13         int try;
  14         for (try=0; try<MAXTRIES; try++) {
  15                 __randname(s+13);
  16                 fd = sys_open(s, O_RDWR|O_CREAT|O_EXCL, 0600);
  17                 if (fd >= 0) {
  18 #ifdef SYS_unlink
  19                         __syscall(SYS_unlink, s);
  20 #else
  21                         __syscall(SYS_unlinkat, AT_FDCWD, s, 0);
  22 #endif
  23                         f = __fdopen(fd, "w+");
  24                         if (!f) __syscall(SYS_close, fd);
  25                         return f;
  26                 }
  27         }
  28         return 0;
  29 }