Commit 9cd65655 authored by Alexey Dobriyan's avatar Alexey Dobriyan Committed by Linus Torvalds
Browse files

proc: test /proc/self/wchan 

This patch starts testing /proc.  Many more tests to come (I promise).

Read from /proc/self/wchan should always return "0" as current is in
TASK_RUNNING state while reading /proc/self/wchan.

Link: http://lkml.kernel.org/r/20180226212006.GA742@avx2


Signed-off-by: default avatarAlexey Dobriyan <adobriyan@gmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 835b94e0

tools/testing/selftests/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ TARGETS += mqueue 
TARGETS += net

TARGETS += nsfs

TARGETS += powerpc

TARGETS += proc

TARGETS += pstore

TARGETS += ptrace

TARGETS += seccomp

tools/testing/selftests/proc/.gitignore

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/proc-self-wchan

tools/testing/selftests/proc/Makefile

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CFLAGS += -Wall -O2



TEST_GEN_PROGS :=

TEST_GEN_PROGS += proc-self-wchan



include ../lib.mk

tools/testing/selftests/proc/config

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CONFIG_PROC_FS=y

tools/testing/selftests/proc/proc-self-wchan.c

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+25 −0
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#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <errno.h>

#include <unistd.h>



int main(void)

{

	char buf[64];

	int fd;



	fd = open("/proc/self/wchan", O_RDONLY);

	if (fd == -1) {

		if (errno == ENOENT)

			return 2;

		return 1;

	}



	buf[0] = '\0';

	if (read(fd, buf, sizeof(buf)) != 1)

		return 1;

	if (buf[0] != '0')

		return 1;

	return 0;

}

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