selftests/proc/self.c

0001 /*
0002  * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
0003  *
0004  * Permission to use, copy, modify, and distribute this software for any
0005  * purpose with or without fee is hereby granted, provided that the above
0006  * copyright notice and this permission notice appear in all copies.
0007  *
0008  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
0009  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
0010  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
0011  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
0012  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
0013  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
0014  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
0015  */
0016 // Test that /proc/self gives correct TGID.
0017 #undef NDEBUG
0018 #include <assert.h>
0019 #include <stdio.h>
0020 #include <unistd.h>
0021
0022 #include "proc.h"
0023
0024 int main(void)
0025 {
0026     char buf1[64], buf2[64];
0027     pid_t pid;
0028     ssize_t rv;
0029
0030     pid = sys_getpid();
0031     snprintf(buf1, sizeof(buf1), "%u", pid);
0032
0033     rv = readlink("/proc/self", buf2, sizeof(buf2));
0034     assert(rv == strlen(buf1));
0035     buf2[rv] = '\0';
0036     assert(streq(buf1, buf2));
0037
0038     return 0;
0039 }