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Commit 61d47c4e authored by Alexey Dobriyan's avatar Alexey Dobriyan Committed by Linus Torvalds
Browse files

proc: test /proc/self symlink 

There are plans to change how /proc/self result is calculated,
for that a test is necessary.

Use direct system call because of this whole getpid caching story.

Link: http://lkml.kernel.org/r/20180627195103.GB18113@avx2


Signed-off-by: default avatarAlexey Dobriyan <adobriyan@gmail.com>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent bdf228a2

tools/testing/selftests/proc/.gitignore

+1 −0
Original line number Diff line number Diff line
@@ -9,3 +9,4 @@ 
/proc-uptime-001

/proc-uptime-002

/read

/self

tools/testing/selftests/proc/Makefile

+2 −0
Original line number Diff line number Diff line 
CFLAGS += -Wall -O2 -Wno-unused-function

CFLAGS += -D_GNU_SOURCE



TEST_GEN_PROGS :=

TEST_GEN_PROGS += fd-001-lookup
@@ -12,5 +13,6 @@ TEST_GEN_PROGS += proc-self-wchan 
TEST_GEN_PROGS += proc-uptime-001

TEST_GEN_PROGS += proc-uptime-002

TEST_GEN_PROGS += read

TEST_GEN_PROGS += self



include ../lib.mk

tools/testing/selftests/proc/proc.h

+7 −0
Original line number Diff line number Diff line
@@ -6,6 +6,13 @@ 
#include <stdbool.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <sys/syscall.h>



static inline pid_t sys_getpid(void)

{

	return syscall(SYS_getpid);

}



static inline bool streq(const char *s1, const char *s2)

{

tools/testing/selftests/proc/self.c

0 → 100644
+39 −0
Original line number Diff line number Diff line 
/*

 * 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.

 */

// Test that /proc/self gives correct TGID.

#undef NDEBUG

#include <assert.h>

#include <stdio.h>

#include <unistd.h>



#include "proc.h"



int main(void)

{

	char buf1[64], buf2[64];

	pid_t pid;

	ssize_t rv;



	pid = sys_getpid();

	snprintf(buf1, sizeof(buf1), "%u", pid);



	rv = readlink("/proc/self", buf2, sizeof(buf2));

	assert(rv == strlen(buf1));

	buf2[rv] = '\0';

	assert(streq(buf1, buf2));



	return 0;

}