fusl/src/stdio/tmpfile.c

#include <stdio.h>
#include <fcntl.h>
#include "stdio_impl.h"

#define MAXTRIES 100

char* __randname(char*);

FILE* tmpfile(void) {
  char s[] = "/tmp/tmpfile_XXXXXX";
  int fd;
  FILE* f;
  int try
    ;
  for (try = 0; try < MAXTRIES; try ++) {
    __randname(s + 13);
    fd = sys_open(s, O_RDWR | O_CREAT | O_EXCL, 0600);
    if (fd >= 0) {
#ifdef SYS_unlink
      __syscall(SYS_unlink, s);
#else
      __syscall(SYS_unlinkat, AT_FDCWD, s, 0);
#endif
      f = __fdopen(fd, "w+");
      if (!f)
        __syscall(SYS_close, fd);
      return f;
    }
  }
  return 0;
}

LFS64(tmpfile);