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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 <string.h>
 24 #include <stdio.h>
 25 
 26 static inline ssize_t sys_read(int fd, void *buf, size_t len)
 27 {
 28         return syscall(SYS_read, fd, buf, len);
 29 }
 30 
 31 int main(void)
 32 {
 33         char buf1[64];
 34         char buf2[64];
 35         int fd;
 36         ssize_t rv;
 37 
 38         fd = open("/proc/self/syscall", O_RDONLY);
 39         if (fd == -1) {
 40                 if (errno == ENOENT)
 41                         return 4;
 42                 return 1;
 43         }
 44 
 45         /* Do direct system call as libc can wrap anything. */
 46         snprintf(buf1, sizeof(buf1), "%ld 0x%lx 0x%lx 0x%lx",
 47                  (long)SYS_read, (long)fd, (long)buf2, (long)sizeof(buf2));
 48 
 49         memset(buf2, 0, sizeof(buf2));
 50         rv = sys_read(fd, buf2, sizeof(buf2));
 51         if (rv < 0)
 52                 return 1;
 53         if (rv < strlen(buf1))
 54                 return 1;
 55         if (strncmp(buf1, buf2, strlen(buf1)) != 0)
 56                 return 1;
 57 
 58         return 0;
 59 }
 60 

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