mirror of
https://github.com/torvalds/linux.git
synced 2024-12-07 03:21:32 +00:00
f3ae6c6e8a
Makefile already contains -D_GNU_SOURCE, so we can remove it from the *.c files. Signed-off-by: Tommi Rantala <tommi.t.rantala@nokia.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
/*
|
|
* Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
#include <unistd.h>
|
|
#include <sys/syscall.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
|
|
static inline ssize_t sys_read(int fd, void *buf, size_t len)
|
|
{
|
|
return syscall(SYS_read, fd, buf, len);
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
char buf1[64];
|
|
char buf2[64];
|
|
int fd;
|
|
ssize_t rv;
|
|
|
|
fd = open("/proc/self/syscall", O_RDONLY);
|
|
if (fd == -1) {
|
|
if (errno == ENOENT)
|
|
return 4;
|
|
return 1;
|
|
}
|
|
|
|
/* Do direct system call as libc can wrap anything. */
|
|
snprintf(buf1, sizeof(buf1), "%ld 0x%lx 0x%lx 0x%lx",
|
|
(long)SYS_read, (long)fd, (long)buf2, (long)sizeof(buf2));
|
|
|
|
memset(buf2, 0, sizeof(buf2));
|
|
rv = sys_read(fd, buf2, sizeof(buf2));
|
|
if (rv < 0)
|
|
return 1;
|
|
if (rv < strlen(buf1))
|
|
return 1;
|
|
if (strncmp(buf1, buf2, strlen(buf1)) != 0)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|