5.13.c

#include <errno.h>
#include "apue.h"

void make_temp(char *template);

int main() {
  char good_template[] = "/tmp/dirXXXXXX";
  char *bad_template = "/tmp/dirXXXXXX";

  printf("trying to create first temp file...\n");
  make_temp(good_template);
  printf("try to create second temp file...\n");
  make_temp(bad_template);
  return 0;
}

void make_temp(char *template) {
  int fd;
  struct stat sbuf;

  if ((fd = mkstemp(template)) < 0) {
    err_sys("can't create temp file");
  }
  printf("temp name = %s\n", template);
  close(fd);

  if (stat(template, &sbuf) < 0) {
    if (errno == ENOENT) {
      printf("file doesn't exist\n");
    } else {
      err_sys("stat failed");
    }
  } else {
    printf("file exists\n");
    unlink(template);
  }
}