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proc: test /proc/self symlink

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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: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan 2018-08-21 21:54:16 -07:00 committed by Linus Torvalds
parent bdf228a272
commit 61d47c4e71
4 changed files with 49 additions and 0 deletions
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1
tools/testing/selftests/proc/.gitignore vendored
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@ -9,3 +9,4 @@
/proc-uptime-001
/proc-uptime-002
/read
/self

2
tools/testing/selftests/proc/Makefile
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@ -1,4 +1,5 @@
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

7
tools/testing/selftests/proc/proc.h
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@ -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)
{

39
tools/testing/selftests/proc/self.c Normal file
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@ -0,0 +1,39 @@
/*
* 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;
}