ce3adf4362
didn't use them. This will make future merges from the vendor tree much easier. Approved by: re (gjb)
64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
/*
|
|
* Copyright (c) 2006 Darren Tucker
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <fcntl.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
#define NUM_OPENS 10
|
|
|
|
int closefrom(int);
|
|
|
|
void
|
|
fail(char *msg)
|
|
{
|
|
fprintf(stderr, "closefrom: %s\n", msg);
|
|
exit(1);
|
|
}
|
|
|
|
int
|
|
main(void)
|
|
{
|
|
int i, max, fds[NUM_OPENS];
|
|
char buf[512];
|
|
|
|
for (i = 0; i < NUM_OPENS; i++)
|
|
if ((fds[i] = open("/dev/null", O_RDONLY)) == -1)
|
|
exit(0); /* can't test */
|
|
max = i - 1;
|
|
|
|
/* should close last fd only */
|
|
closefrom(fds[max]);
|
|
if (close(fds[max]) != -1)
|
|
fail("failed to close highest fd");
|
|
|
|
/* make sure we can still use remaining descriptors */
|
|
for (i = 0; i < max; i++)
|
|
if (read(fds[i], buf, sizeof(buf)) == -1)
|
|
fail("closed descriptors it should not have");
|
|
|
|
/* should close all fds */
|
|
closefrom(fds[0]);
|
|
for (i = 0; i < NUM_OPENS; i++)
|
|
if (close(fds[i]) != -1)
|
|
fail("failed to close from lowest fd");
|
|
return 0;
|
|
}
|