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Commit | Line | Data |
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9108f8d9 | 1 | /* |
2 | * Copyright (c) 2006 Darren Tucker | |
3 | * | |
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. | |
7 | * | |
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. | |
15 | */ | |
16 | ||
17 | #include <sys/types.h> | |
18 | #include <sys/stat.h> | |
19 | ||
20 | #include <fcntl.h> | |
21 | #include <stdio.h> | |
22 | #include <stdlib.h> | |
23 | #include <unistd.h> | |
24 | ||
25 | #define NUM_OPENS 10 | |
26 | ||
27 | void | |
28 | fail(char *msg) | |
29 | { | |
30 | fprintf(stderr, "closefrom: %s\n", msg); | |
31 | exit(1); | |
32 | } | |
33 | ||
34 | int | |
35 | main(void) | |
36 | { | |
37 | int i, max, fds[NUM_OPENS]; | |
38 | char buf[512]; | |
39 | ||
40 | for (i = 0; i < NUM_OPENS; i++) | |
d4487008 | 41 | if ((fds[i] = open("/dev/null", O_RDONLY)) == -1) |
9108f8d9 | 42 | exit(0); /* can't test */ |
43 | max = i - 1; | |
44 | ||
45 | /* should close last fd only */ | |
46 | closefrom(fds[max]); | |
47 | if (close(fds[max]) != -1) | |
48 | fail("failed to close highest fd"); | |
49 | ||
50 | /* make sure we can still use remaining descriptors */ | |
51 | for (i = 0; i < max; i++) | |
52 | if (read(fds[i], buf, sizeof(buf)) == -1) | |
53 | fail("closed descriptors it should not have"); | |
54 | ||
55 | /* should close all fds */ | |
56 | closefrom(fds[0]); | |
57 | for (i = 0; i < NUM_OPENS; i++) | |
58 | if (close(fds[i]) != -1) | |
59 | fail("failed to close from lowest fd"); | |
47686178 | 60 | return 0; |
9108f8d9 | 61 | } |