2 * Copyright (c) 2006 Darren Tucker
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 #include <sys/types.h>
32 fprintf(stderr, "closefrom: %s\n", msg);
39 int i, max, fds[NUM_OPENS];
42 for (i = 0; i < NUM_OPENS; i++)
43 if ((fds[i] = open("/dev/null", O_RDONLY)) == -1)
44 exit(0); /* can't test */
47 /* should close last fd only */
49 if (close(fds[max]) != -1)
50 fail("failed to close highest fd");
52 /* make sure we can still use remaining descriptors */
53 for (i = 0; i < max; i++)
54 if (read(fds[i], buf, sizeof(buf)) == -1)
55 fail("closed descriptors it should not have");
57 /* should close all fds */
59 for (i = 0; i < NUM_OPENS; i++)
60 if (close(fds[i]) != -1)
61 fail("failed to close from lowest fd");