]>
Commit | Line | Data |
---|---|---|
5eef597e MP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2014 David Herrmann <dh.herrmann@gmail.com> | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <errno.h> | |
23 | #include <fcntl.h> | |
24 | #include <locale.h> | |
25 | #include <string.h> | |
26 | #include <sys/wait.h> | |
27 | #include <unistd.h> | |
28 | ||
29 | #include "def.h" | |
30 | #include "pty.h" | |
31 | #include "util.h" | |
32 | ||
33 | static const char sndmsg[] = "message\n"; | |
34 | static const char rcvmsg[] = "message\r\n"; | |
35 | static char rcvbuf[128]; | |
36 | static size_t rcvsiz = 0; | |
37 | static sd_event *event; | |
38 | ||
39 | static void run_child(Pty *pty) { | |
40 | ssize_t r, l; | |
41 | char buf[512]; | |
42 | ||
43 | r = read(0, buf, sizeof(buf)); | |
44 | assert_se((size_t)r == strlen(sndmsg)); | |
45 | assert_se(!strncmp(buf, sndmsg, r)); | |
46 | ||
47 | l = write(1, buf, r); | |
48 | assert_se(l == r); | |
49 | } | |
50 | ||
51 | static int pty_fn(Pty *pty, void *userdata, unsigned int ev, const void *ptr, size_t size) { | |
52 | switch (ev) { | |
53 | case PTY_DATA: | |
54 | assert_se(rcvsiz < strlen(rcvmsg) * 2); | |
55 | assert_se(rcvsiz + size < sizeof(rcvbuf)); | |
56 | ||
57 | memcpy(&rcvbuf[rcvsiz], ptr, size); | |
58 | rcvsiz += size; | |
59 | ||
60 | if (rcvsiz >= strlen(rcvmsg) * 2) { | |
61 | assert_se(rcvsiz == strlen(rcvmsg) * 2); | |
62 | assert_se(!memcmp(rcvbuf, rcvmsg, strlen(rcvmsg))); | |
63 | assert_se(!memcmp(&rcvbuf[strlen(rcvmsg)], rcvmsg, strlen(rcvmsg))); | |
64 | } | |
65 | ||
66 | break; | |
67 | case PTY_HUP: | |
68 | /* This is guaranteed to appear _after_ the input queues are | |
69 | * drained! */ | |
70 | assert_se(rcvsiz == strlen(rcvmsg) * 2); | |
71 | break; | |
72 | case PTY_CHILD: | |
73 | /* this may appear at any time */ | |
74 | break; | |
75 | default: | |
76 | assert_se(0); | |
77 | break; | |
78 | } | |
79 | ||
80 | /* if we got HUP _and_ CHILD, exit */ | |
81 | if (pty_get_fd(pty) < 0 && pty_get_child(pty) < 0) | |
82 | sd_event_exit(event, 0); | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
87 | static void run_parent(Pty *pty) { | |
88 | int r; | |
89 | ||
90 | /* write message to pty, ECHO mode guarantees that we get it back | |
91 | * twice: once via ECHO, once from the run_child() fn */ | |
92 | assert_se(pty_write(pty, sndmsg, strlen(sndmsg)) >= 0); | |
93 | ||
94 | r = sd_event_loop(event); | |
95 | assert_se(r >= 0); | |
96 | } | |
97 | ||
98 | static void test_pty(void) { | |
99 | pid_t pid; | |
100 | Pty *pty; | |
101 | ||
102 | rcvsiz = 0; | |
e735f4d4 | 103 | zero(rcvbuf); |
5eef597e MP |
104 | |
105 | assert_se(sd_event_default(&event) >= 0); | |
106 | ||
107 | pid = pty_fork(&pty, event, pty_fn, NULL, 80, 25); | |
108 | assert_se(pid >= 0); | |
109 | ||
110 | if (pid == 0) { | |
111 | /* child */ | |
112 | run_child(pty); | |
113 | exit(0); | |
114 | } | |
115 | ||
116 | /* parent */ | |
117 | run_parent(pty); | |
118 | ||
119 | /* Make sure the PTY recycled the child; yeah, this is racy if the | |
120 | * PID was already reused; but that seems fine for a test. */ | |
121 | assert_se(waitpid(pid, NULL, WNOHANG) < 0 && errno == ECHILD); | |
122 | ||
123 | pty_unref(pty); | |
124 | sd_event_unref(event); | |
125 | } | |
126 | ||
127 | int main(int argc, char *argv[]) { | |
128 | unsigned int i; | |
129 | ||
130 | log_parse_environment(); | |
131 | log_open(); | |
132 | ||
133 | assert_se(sigprocmask_many(SIG_BLOCK, SIGCHLD, -1) >= 0); | |
134 | ||
135 | /* Oh, there're ugly races in the TTY layer regarding HUP vs IN. Turns | |
136 | * out they appear only 10% of the time. I fixed all of them and | |
137 | * don't see them, anymore. But lets be safe and run this 1000 times | |
138 | * so we catch any new ones, in case they appear again. */ | |
139 | for (i = 0; i < 1000; ++i) | |
140 | test_pty(); | |
141 | ||
142 | return 0; | |
143 | } |