proc: add selftest for last field of /proc/loadavg (5de3d401) · Commits · 戴 / test

tools/testing/selftests/proc/.gitignore

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Original line number	Diff line number	Diff line
		/proc-loadavg-001
		/proc-self-map-files-001
		/proc-self-map-files-002
		/proc-self-syscall

tools/testing/selftests/proc/Makefile

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Original line number	Diff line number	Diff line
		CFLAGS += -Wall -O2

		TEST_GEN_PROGS :=
		TEST_GEN_PROGS += proc-loadavg-001
		TEST_GEN_PROGS += proc-self-map-files-001
		TEST_GEN_PROGS += proc-self-map-files-002
		TEST_GEN_PROGS += proc-self-syscall

tools/testing/selftests/proc/proc-loadavg-001.c

0 → 100644

+83 −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/loadavg correctly reports last pid in pid namespace. */
		#define _GNU_SOURCE
		#include <errno.h>
		#include <sched.h>
		#include <sys/types.h>
		#include <sys/stat.h>
		#include <fcntl.h>
		#include <unistd.h>
		#include <sys/wait.h>

		int main(void)
		{
		pid_t pid;
		int wstatus;

		if (unshare(CLONE_NEWPID) == -1) {
		if (errno == ENOSYS \|\| errno == EPERM)
		return 2;
		return 1;
		}

		pid = fork();
		if (pid == -1)
		return 1;
		if (pid == 0) {
		char buf[128], *p;
		int fd;
		ssize_t rv;

		fd = open("/proc/loadavg" , O_RDONLY);
		if (fd == -1)
		return 1;
		rv = read(fd, buf, sizeof(buf));
		if (rv < 3)
		return 1;
		p = buf + rv;

		/* pid 1 */
		if (!(p[-3] == ' ' && p[-2] == '1' && p[-1] == '\n'))
		return 1;

		pid = fork();
		if (pid == -1)
		return 1;
		if (pid == 0)
		return 0;
		if (waitpid(pid, NULL, 0) == -1)
		return 1;

		lseek(fd, 0, SEEK_SET);
		rv = read(fd, buf, sizeof(buf));
		if (rv < 3)
		return 1;
		p = buf + rv;

		/* pid 2 */
		if (!(p[-3] == ' ' && p[-2] == '2' && p[-1] == '\n'))
		return 1;

		return 0;
		}

		if (waitpid(pid, &wstatus, 0) == -1)
		return 1;
		if (WIFEXITED(wstatus) && WEXITSTATUS(wstatus) == 0)
		return 0;
		return 1;
		}

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