usr/src/test/libc-tests/tests/closefrom.c

   1 /*
   2  * This file and its contents are supplied under the terms of the
   3  * Common Development and Distribution License ("CDDL"), version 1.0.
   4  * You may only use this file in accordance with the terms of version
   5  * 1.0 of the CDDL.
   6  *
   7  * A full copy of the text of the CDDL should have accompanied this
   8  * source.  A copy of the CDDL is also available via the Internet at
   9  * http://www.illumos.org/license/CDDL.
  10  */
  11
  12 /*
  13  * Copyright 2023 Bill Sommerfeld <sommerfeld@alum.mit.edu>
  14  */
  15
  16 /*
  17  * Test for closefrom().  Test cases were inspired by xapian's
  18  * test_closefrom1() and are somewhat incomplete (we don't test
  19  * what happens when /proc/self/fd isn't available).
  20  */
  21 #include <err.h>
  22 #include <errno.h>
  23 #include <limits.h>
  24 #include <stdarg.h>
  25 #include <stdlib.h>
  26 #include <unistd.h>
  27 #include <sys/debug.h>
  28
  29 int
  30 main(void)
  31 {
  32         closefrom(INT_MAX);     /* should be a no-op */
  33
  34         VERIFY3S(dup2(1, 10), ==, 10);
  35         VERIFY3S(dup2(1, 11), ==, 11);
  36         VERIFY3S(dup2(1, 15), ==, 15);
  37
  38         closefrom(11);
  39
  40         VERIFY3S(close(10), ==, 0);
  41         VERIFY3S(close(11), ==, -1);
  42         VERIFY3S(errno, ==, EBADF);
  43         VERIFY3S(close(15), ==, -1);
  44         VERIFY3S(errno, ==, EBADF);
  45
  46         exit(0);
  47 }