1 /*
2 * Copyright (c) 2013 Oracle and/or its affiliates. All Rights Reserved.
3 * Copyright (c) 2020 Petr Vorel <pvorel@suse.cz>
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation; either version 2 of
8 * the License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it would be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Author: Alexey Kodanev <alexey.kodanev@oracle.com>
20 */
21
22 #include <errno.h>
23 #include <sys/types.h>
24 #include <sys/stat.h>
25 #include <sys/wait.h>
26 #include <fcntl.h>
27 #include <unistd.h>
28 #include <signal.h>
29 #include "test.h"
30 #include "tst_cmd.h"
31
32 #define OPEN_MODE (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)
33 #define OPEN_FLAGS (O_WRONLY | O_APPEND | O_CREAT)
34
tst_cmd_fds_(void (cleanup_fn)(void),const char * const argv[],int stdout_fd,int stderr_fd,enum tst_cmd_flags flags)35 int tst_cmd_fds_(void (cleanup_fn)(void),
36 const char *const argv[],
37 int stdout_fd,
38 int stderr_fd,
39 enum tst_cmd_flags flags)
40 {
41 int rc;
42
43 if (argv == NULL || argv[0] == NULL) {
44 tst_brkm(TBROK, cleanup_fn,
45 "argument list is empty at %s:%d", __FILE__, __LINE__);
46 return -1;
47 }
48
49 /*
50 * The tst_sig() install poisoned signal handlers for all signals the
51 * test is not expected to get.
52 *
53 * So we temporarily disable the handler for sigchild we get after our
54 * child exits so that we don't have to disable it in each test that
55 * uses this interface.
56 */
57 void *old_handler = signal(SIGCHLD, SIG_DFL);
58
59 char path[PATH_MAX];
60
61 if (tst_get_path(argv[0], path, sizeof(path))) {
62 if (flags & TST_CMD_TCONF_ON_MISSING)
63 tst_brkm(TCONF, cleanup_fn, "Couldn't find '%s' in $PATH at %s:%d", argv[0],
64 __FILE__, __LINE__);
65 else
66 return 255;
67 }
68
69 pid_t pid = vfork();
70 if (pid == -1) {
71 tst_brkm(TBROK | TERRNO, cleanup_fn, "vfork failed at %s:%d",
72 __FILE__, __LINE__);
73 return -1;
74 }
75 if (!pid) {
76 /* redirecting stdout and stderr if needed */
77 if (stdout_fd != -1) {
78 close(STDOUT_FILENO);
79 dup2(stdout_fd, STDOUT_FILENO);
80 }
81
82 if (stderr_fd != -1) {
83 close(STDERR_FILENO);
84 dup2(stderr_fd, STDERR_FILENO);
85 }
86
87 execvp(argv[0], (char *const *)argv);
88 _exit(254);
89 }
90
91 int ret = -1;
92 if (waitpid(pid, &ret, 0) != pid) {
93 tst_brkm(TBROK | TERRNO, cleanup_fn, "waitpid failed at %s:%d",
94 __FILE__, __LINE__);
95 return -1;
96 }
97
98 signal(SIGCHLD, old_handler);
99
100 if (!WIFEXITED(ret)) {
101 tst_brkm(TBROK, cleanup_fn, "failed to exec cmd '%s' at %s:%d",
102 argv[0], __FILE__, __LINE__);
103 return -1;
104 }
105
106 rc = WEXITSTATUS(ret);
107
108 if (!(flags & TST_CMD_PASS_RETVAL) && rc) {
109 tst_brkm(TBROK, cleanup_fn,
110 "'%s' exited with a non-zero code %d at %s:%d",
111 argv[0], rc, __FILE__, __LINE__);
112 return -1;
113 }
114
115 return rc;
116 }
117
tst_cmd_(void (cleanup_fn)(void),const char * const argv[],const char * stdout_path,const char * stderr_path,enum tst_cmd_flags flags)118 int tst_cmd_(void (cleanup_fn)(void),
119 const char *const argv[],
120 const char *stdout_path,
121 const char *stderr_path,
122 enum tst_cmd_flags flags)
123 {
124 int stdout_fd = -1;
125 int stderr_fd = -1;
126 int rc;
127
128 if (stdout_path != NULL) {
129 stdout_fd = open(stdout_path,
130 OPEN_FLAGS, OPEN_MODE);
131
132 if (stdout_fd == -1)
133 tst_resm(TWARN | TERRNO,
134 "open() on %s failed at %s:%d",
135 stdout_path, __FILE__, __LINE__);
136 }
137
138 if (stderr_path != NULL) {
139 stderr_fd = open(stderr_path,
140 OPEN_FLAGS, OPEN_MODE);
141
142 if (stderr_fd == -1)
143 tst_resm(TWARN | TERRNO,
144 "open() on %s failed at %s:%d",
145 stderr_path, __FILE__, __LINE__);
146 }
147
148 rc = tst_cmd_fds(cleanup_fn, argv, stdout_fd, stderr_fd, flags);
149
150 if ((stdout_fd != -1) && (close(stdout_fd) == -1))
151 tst_resm(TWARN | TERRNO,
152 "close() on %s failed at %s:%d",
153 stdout_path, __FILE__, __LINE__);
154
155 if ((stderr_fd != -1) && (close(stderr_fd) == -1))
156 tst_resm(TWARN | TERRNO,
157 "close() on %s failed at %s:%d",
158 stderr_path, __FILE__, __LINE__);
159
160 return rc;
161 }
162
tst_system(const char * command)163 int tst_system(const char *command)
164 {
165 int ret = 0;
166
167 /*
168 *Temporarily disable SIGCHLD of user defined handler, so the
169 *system(3) function will not cause unexpected SIGCHLD signal
170 *callback function for test cases.
171 */
172 void *old_handler = signal(SIGCHLD, SIG_DFL);
173
174 ret = system(command);
175
176 signal(SIGCHLD, old_handler);
177 return ret;
178 }
179