--- /dev/null
+/* Basic tests for Linux SYSV message queue extensions.
+ Copyright (C) 2020 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>
projects / thirdparty / glibc.git / commitdiff
