diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/tst-sysvmsg-linux.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/tst-sysvmsg-linux.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/tst-sysvmsg-linux.c b/sysdeps/unix/sysv/linux/tst-sysvmsg-linux.c new file mode 100644 index 0000000000..630f4f792c --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-sysvmsg-linux.c @@ -0,0 +1,177 @@ +/* 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> |