proc: test /proc/self/syscall

/proc-self-wchan

/proc-self-mem

/proc-self-syscall

CFLAGS += -Wall -O2

TEST_GEN_PROGS :=

TEST_GEN_PROGS += proc-self-syscall

TEST_GEN_PROGS += proc-self-wchan

include ../lib.mk

#define _GNU_SOURCE

#include <unistd.h>

#include <sys/syscall.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <errno.h>

#include <unistd.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 2;

		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;

}