1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 */
5
6 /*
7 * DESCRIPTION
8 * 1) msgsnd(2) fails and sets errno to EAGAIN if the message can't be
9 * sent due to the msg_qbytes limit for the queue and IPC_NOWAIT is
10 * specified.
11 * 2) msgsnd(2) fails and sets errno to EINTR if msgsnd(2) sleeps on a
12 * full message queue condition and the process catches a signal.
13 */
14
15 #include <errno.h>
16 #include <unistd.h>
17 #include <sys/types.h>
18 #include <sys/ipc.h>
19 #include <sys/msg.h>
20
21 #include "tst_test.h"
22 #include "tst_safe_sysv_ipc.h"
23 #include "libnewipc.h"
24
25 static key_t msgkey;
26 static int queue_id = -1;
27 static struct buf {
28 long type;
29 char text[MSGSIZE];
30 } snd_buf = {1, "hello"};
31
32 static struct tcase {
33 int flag;
34 int exp_err;
35 /*1: nobody expected 0: root expected */
36 int exp_user;
37 } tcases[] = {
38 {IPC_NOWAIT, EAGAIN, 0},
39 {0, EINTR, 1}
40 };
41
verify_msgsnd(struct tcase * tc)42 static void verify_msgsnd(struct tcase *tc)
43 {
44 TST_EXP_FAIL(msgsnd(queue_id, &snd_buf, MSGSIZE, tc->flag), tc->exp_err,
45 "msgsnd(%i, %p, %i, %i)", queue_id, &snd_buf, MSGSIZE, tc->flag);
46 }
47
sighandler(int sig)48 static void sighandler(int sig)
49 {
50 if (sig == SIGHUP)
51 return;
52 else
53 _exit(TBROK);
54 }
55
do_test(unsigned int n)56 static void do_test(unsigned int n)
57 {
58 pid_t pid;
59 struct tcase *tc = &tcases[n];
60
61 if (tc->exp_user == 0) {
62 verify_msgsnd(tc);
63 return;
64 }
65
66 pid = SAFE_FORK();
67 if (!pid) {
68 SAFE_SIGNAL(SIGHUP, sighandler);
69 verify_msgsnd(tc);
70 _exit(0);
71 }
72
73 TST_PROCESS_STATE_WAIT(pid, 'S', 0);
74 SAFE_KILL(pid, SIGHUP);
75 tst_reap_children();
76 }
77
setup(void)78 static void setup(void)
79 {
80 msgkey = GETIPCKEY();
81
82 queue_id = SAFE_MSGGET(msgkey, IPC_CREAT | IPC_EXCL | MSG_RW);
83
84 while (msgsnd(queue_id, &snd_buf, MSGSIZE, IPC_NOWAIT) != -1)
85 snd_buf.type += 1;
86 }
87
cleanup(void)88 static void cleanup(void)
89 {
90 if (queue_id != -1)
91 SAFE_MSGCTL(queue_id, IPC_RMID, NULL);
92 }
93
94 static struct tst_test test = {
95 .needs_tmpdir = 1,
96 .needs_root = 1,
97 .forks_child = 1,
98 .tcnt = ARRAY_SIZE(tcases),
99 .setup = setup,
100 .cleanup = cleanup,
101 .test = do_test
102 };
103