| 1 | /* |
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| 2 | * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com> |
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| 3 | * |
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| 4 | * Permission to use, copy, modify, and distribute this software for any |
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| 5 | * purpose with or without fee is hereby granted, provided that the above |
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| 6 | * copyright notice and this permission notice appear in all copies. |
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| 7 | * |
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| 8 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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| 9 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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| 10 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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| 11 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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| 12 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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| 13 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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| 14 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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| 15 | */ |
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| 16 | /* Test that /proc/loadavg correctly reports last pid in pid namespace. */ |
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| 17 | #include <errno.h> |
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| 18 | #include <sched.h> |
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| 19 | #include <sys/types.h> |
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| 20 | #include <sys/stat.h> |
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| 21 | #include <fcntl.h> |
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| 22 | #include <unistd.h> |
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| 23 | #include <sys/wait.h> |
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| 24 | |
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| 25 | int main(void) |
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| 26 | { |
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| 27 | pid_t pid; |
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| 28 | int wstatus; |
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| 29 | |
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| 30 | if (unshare(CLONE_NEWPID) == -1) { |
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| 31 | if (errno == ENOSYS || errno == EPERM) |
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| 32 | return 4; |
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| 33 | return 1; |
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| 34 | } |
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| 35 | |
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| 36 | pid = fork(); |
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| 37 | if (pid == -1) |
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| 38 | return 1; |
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| 39 | if (pid == 0) { |
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| 40 | char buf[128], *p; |
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| 41 | int fd; |
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| 42 | ssize_t rv; |
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| 43 | |
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| 44 | fd = open("/proc/loadavg" , O_RDONLY); |
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| 45 | if (fd == -1) |
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| 46 | return 1; |
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| 47 | rv = read(fd, buf, sizeof(buf)); |
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| 48 | if (rv < 3) |
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| 49 | return 1; |
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| 50 | p = buf + rv; |
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| 51 | |
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| 52 | /* pid 1 */ |
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| 53 | if (!(p[-3] == ' ' && p[-2] == '1' && p[-1] == '\n')) |
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| 54 | return 1; |
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| 55 | |
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| 56 | pid = fork(); |
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| 57 | if (pid == -1) |
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| 58 | return 1; |
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| 59 | if (pid == 0) |
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| 60 | return 0; |
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| 61 | if (waitpid(pid, NULL, 0) == -1) |
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| 62 | return 1; |
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| 63 | |
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| 64 | lseek(fd, 0, SEEK_SET); |
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| 65 | rv = read(fd, buf, sizeof(buf)); |
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| 66 | if (rv < 3) |
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| 67 | return 1; |
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| 68 | p = buf + rv; |
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| 69 | |
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| 70 | /* pid 2 */ |
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| 71 | if (!(p[-3] == ' ' && p[-2] == '2' && p[-1] == '\n')) |
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| 72 | return 1; |
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| 73 | |
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| 74 | return 0; |
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| 75 | } |
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| 76 | |
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| 77 | if (waitpid(pid, &wstatus, 0) == -1) |
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| 78 | return 1; |
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| 79 | if (WIFEXITED(wstatus) && WEXITSTATUS(wstatus) == 0) |
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| 80 | return 0; |
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| 81 | return 1; |
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| 82 | } |
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| 83 | |
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