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/* Basic tests for Linux SYSV message queue extensions.
Copyright (C) 2020-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <sys/ipc.h>
#include <sys/msg.h>
#include <errno.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdio.h>
#include <support/check.h>
#include <support/temp_file.h>
#define MSGQ_MODE 0644
/* These are for the temporary file we generate. */
static char *name;
static int msqid;
static void
remove_msq (void)
{
/* Enforce message queue removal in case of early test failure.
Ignore error since the msg may already have being removed. */
msgctl (msqid, IPC_RMID, NULL);
}
static void
do_prepare (int argc, char *argv[])
{
TEST_VERIFY_EXIT (create_temp_file ("tst-sysvmsg.", &name) != -1);
}
#define PREPARE do_prepare
struct test_msginfo
{
int msgmax;
int msgmnb;
int msgmni;
};
/* It tries to obtain some system-wide SysV messsage queue information from
/proc to check against IPC_INFO/MSG_INFO. The /proc only returns the
tunables value of MSGMAX, MSGMNB, and MSGMNI.
The kernel also returns constant value for MSGSSZ, MSGSEG and also MSGMAP,
MSGPOOL, and MSGTQL (for IPC_INFO). The issue to check them is they might
change over kernel releases. */
static int
read_proc_file (const char *file)
{
FILE *f = fopen (file, "r");
if (f == NULL)
FAIL_UNSUPPORTED ("/proc is not mounted or %s is not available", file);
int v;
int r = fscanf (f, "%d", & v);
TEST_VERIFY_EXIT (r == 1);
fclose (f);
return v;
}
/* Check if the message queue with IDX (index into the kernel's internal
array) matches the one with KEY. The CMD is either MSG_STAT or
MSG_STAT_ANY. */
static bool
check_msginfo (int idx, key_t key, int cmd)
{
struct msqid_ds msginfo;
int mid = msgctl (idx, cmd, &msginfo);
/* Ignore unused array slot returned by the kernel or information from
unknown message queue. */
if ((mid == -1 && errno == EINVAL) || mid != msqid)
return false;
if (mid == -1)
FAIL_EXIT1 ("msgctl with %s failed: %m",
cmd == MSG_STAT ? "MSG_STAT" : "MSG_STAT_ANY");
TEST_COMPARE (msginfo.msg_perm.__key, key);
TEST_COMPARE (msginfo.msg_perm.mode, MSGQ_MODE);
TEST_COMPARE (msginfo.msg_qnum, 0);
return true;
}
static int
do_test (void)
{
atexit (remove_msq);
key_t key = ftok (name, 'G');
if (key == -1)
FAIL_EXIT1 ("ftok failed: %m");
msqid = msgget (key, MSGQ_MODE | IPC_CREAT);
if (msqid == -1)
FAIL_EXIT1 ("msgget failed: %m");
struct test_msginfo tipcinfo;
tipcinfo.msgmax = read_proc_file ("/proc/sys/kernel/msgmax");
tipcinfo.msgmnb = read_proc_file ("/proc/sys/kernel/msgmnb");
tipcinfo.msgmni = read_proc_file ("/proc/sys/kernel/msgmni");
int msqidx;
{
struct msginfo ipcinfo;
msqidx = msgctl (msqid, IPC_INFO, (struct msqid_ds *) &ipcinfo);
if (msqidx == -1)
FAIL_EXIT1 ("msgctl with IPC_INFO failed: %m");
TEST_COMPARE (ipcinfo.msgmax, tipcinfo.msgmax);
TEST_COMPARE (ipcinfo.msgmnb, tipcinfo.msgmnb);
TEST_COMPARE (ipcinfo.msgmni, tipcinfo.msgmni);
}
/* Same as before but with MSG_INFO. */
{
struct msginfo ipcinfo;
msqidx = msgctl (msqid, MSG_INFO, (struct msqid_ds *) &ipcinfo);
if (msqidx == -1)
FAIL_EXIT1 ("msgctl with IPC_INFO failed: %m");
TEST_COMPARE (ipcinfo.msgmax, tipcinfo.msgmax);
TEST_COMPARE (ipcinfo.msgmnb, tipcinfo.msgmnb);
TEST_COMPARE (ipcinfo.msgmni, tipcinfo.msgmni);
}
/* We check if the created message queue shows in global list. */
bool found = false;
for (int i = 0; i <= msqidx; i++)
{
/* We can't tell apart if MSG_STAT_ANY is not supported (kernel older
than 4.17) or if the index used is invalid. So it just check if the
value returned from a valid call matches the created message
queue. */
check_msginfo (i, key, MSG_STAT_ANY);
if (check_msginfo (i, key, MSG_STAT))
{
found = true;
break;
}
}
if (!found)
FAIL_EXIT1 ("msgctl with MSG_STAT/MSG_STAT_ANY could not find the "
"created message queue");
if (msgctl (msqid, IPC_RMID, NULL) == -1)
FAIL_EXIT1 ("msgctl failed");
return 0;
}
#include <support/test-driver.c>
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