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Linux/tools/testing/selftests/proc/proc-self-syscall.c

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  1 /*
  2  * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
  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 #define _GNU_SOURCE
 17 #include <unistd.h>
 18 #include <sys/syscall.h>
 19 #include <sys/types.h>
 20 #include <sys/stat.h>
 21 #include <fcntl.h>
 22 #include <errno.h>
 23 #include <unistd.h>
 24 #include <string.h>
 25 #include <stdio.h>
 26 
 27 static inline ssize_t sys_read(int fd, void *buf, size_t len)
 28 {
 29         return syscall(SYS_read, fd, buf, len);
 30 }
 31 
 32 int main(void)
 33 {
 34         char buf1[64];
 35         char buf2[64];
 36         int fd;
 37         ssize_t rv;
 38 
 39         fd = open("/proc/self/syscall", O_RDONLY);
 40         if (fd == -1) {
 41                 if (errno == ENOENT)
 42                         return 2;
 43                 return 1;
 44         }
 45 
 46         /* Do direct system call as libc can wrap anything. */
 47         snprintf(buf1, sizeof(buf1), "%ld 0x%lx 0x%lx 0x%lx",
 48                  (long)SYS_read, (long)fd, (long)buf2, (long)sizeof(buf2));
 49 
 50         memset(buf2, 0, sizeof(buf2));
 51         rv = sys_read(fd, buf2, sizeof(buf2));
 52         if (rv < 0)
 53                 return 1;
 54         if (rv < strlen(buf1))
 55                 return 1;
 56         if (strncmp(buf1, buf2, strlen(buf1)) != 0)
 57                 return 1;
 58 
 59         return 0;
 60 }
 61 

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