Commit | Line | Data |
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2f4ce5ec JP |
1 | #include <unistd.h> |
2 | #include <sys/types.h> | |
3 | #include <sys/stat.h> | |
4 | #include <fcntl.h> | |
5 | #include <string.h> | |
07eebccb | 6 | #include <linux/string.h> |
2f4ce5ec JP |
7 | #include <errno.h> |
8 | #include <sys/wait.h> | |
9 | #include "subcmd-util.h" | |
07800601 | 10 | #include "run-command.h" |
4b6ab94e | 11 | #include "exec-cmd.h" |
2f4ce5ec JP |
12 | |
13 | #define STRERR_BUFSIZE 128 | |
07800601 IM |
14 | |
15 | static inline void close_pair(int fd[2]) | |
16 | { | |
17 | close(fd[0]); | |
18 | close(fd[1]); | |
19 | } | |
20 | ||
21 | static inline void dup_devnull(int to) | |
22 | { | |
23 | int fd = open("/dev/null", O_RDWR); | |
24 | dup2(fd, to); | |
25 | close(fd); | |
26 | } | |
27 | ||
28 | int start_command(struct child_process *cmd) | |
29 | { | |
30 | int need_in, need_out, need_err; | |
31 | int fdin[2], fdout[2], fderr[2]; | |
6e81c74c | 32 | char sbuf[STRERR_BUFSIZE]; |
07800601 IM |
33 | |
34 | /* | |
35 | * In case of errors we must keep the promise to close FDs | |
36 | * that have been passed in via ->in and ->out. | |
37 | */ | |
38 | ||
39 | need_in = !cmd->no_stdin && cmd->in < 0; | |
40 | if (need_in) { | |
41 | if (pipe(fdin) < 0) { | |
42 | if (cmd->out > 0) | |
43 | close(cmd->out); | |
44 | return -ERR_RUN_COMMAND_PIPE; | |
45 | } | |
46 | cmd->in = fdin[1]; | |
47 | } | |
48 | ||
49 | need_out = !cmd->no_stdout | |
50 | && !cmd->stdout_to_stderr | |
51 | && cmd->out < 0; | |
52 | if (need_out) { | |
53 | if (pipe(fdout) < 0) { | |
54 | if (need_in) | |
55 | close_pair(fdin); | |
56 | else if (cmd->in) | |
57 | close(cmd->in); | |
58 | return -ERR_RUN_COMMAND_PIPE; | |
59 | } | |
60 | cmd->out = fdout[0]; | |
61 | } | |
62 | ||
63 | need_err = !cmd->no_stderr && cmd->err < 0; | |
64 | if (need_err) { | |
65 | if (pipe(fderr) < 0) { | |
66 | if (need_in) | |
67 | close_pair(fdin); | |
68 | else if (cmd->in) | |
69 | close(cmd->in); | |
70 | if (need_out) | |
71 | close_pair(fdout); | |
72 | else if (cmd->out) | |
73 | close(cmd->out); | |
74 | return -ERR_RUN_COMMAND_PIPE; | |
75 | } | |
76 | cmd->err = fderr[0]; | |
77 | } | |
78 | ||
07800601 IM |
79 | fflush(NULL); |
80 | cmd->pid = fork(); | |
81 | if (!cmd->pid) { | |
82 | if (cmd->no_stdin) | |
83 | dup_devnull(0); | |
84 | else if (need_in) { | |
85 | dup2(fdin[0], 0); | |
86 | close_pair(fdin); | |
87 | } else if (cmd->in) { | |
88 | dup2(cmd->in, 0); | |
89 | close(cmd->in); | |
90 | } | |
91 | ||
92 | if (cmd->no_stderr) | |
93 | dup_devnull(2); | |
94 | else if (need_err) { | |
95 | dup2(fderr[1], 2); | |
96 | close_pair(fderr); | |
97 | } | |
98 | ||
99 | if (cmd->no_stdout) | |
100 | dup_devnull(1); | |
101 | else if (cmd->stdout_to_stderr) | |
102 | dup2(2, 1); | |
103 | else if (need_out) { | |
104 | dup2(fdout[1], 1); | |
105 | close_pair(fdout); | |
106 | } else if (cmd->out > 1) { | |
107 | dup2(cmd->out, 1); | |
108 | close(cmd->out); | |
109 | } | |
110 | ||
111 | if (cmd->dir && chdir(cmd->dir)) | |
112 | die("exec %s: cd to %s failed (%s)", cmd->argv[0], | |
07eebccb | 113 | cmd->dir, str_error_r(errno, sbuf, sizeof(sbuf))); |
07800601 IM |
114 | if (cmd->env) { |
115 | for (; *cmd->env; cmd->env++) { | |
116 | if (strchr(*cmd->env, '=')) | |
117 | putenv((char*)*cmd->env); | |
118 | else | |
119 | unsetenv(*cmd->env); | |
120 | } | |
121 | } | |
122 | if (cmd->preexec_cb) | |
123 | cmd->preexec_cb(); | |
46113a54 JP |
124 | if (cmd->exec_cmd) { |
125 | execv_cmd(cmd->argv); | |
07800601 IM |
126 | } else { |
127 | execvp(cmd->argv[0], (char *const*) cmd->argv); | |
128 | } | |
129 | exit(127); | |
130 | } | |
07800601 IM |
131 | |
132 | if (cmd->pid < 0) { | |
133 | int err = errno; | |
134 | if (need_in) | |
135 | close_pair(fdin); | |
136 | else if (cmd->in) | |
137 | close(cmd->in); | |
138 | if (need_out) | |
139 | close_pair(fdout); | |
140 | else if (cmd->out) | |
141 | close(cmd->out); | |
142 | if (need_err) | |
143 | close_pair(fderr); | |
144 | return err == ENOENT ? | |
145 | -ERR_RUN_COMMAND_EXEC : | |
146 | -ERR_RUN_COMMAND_FORK; | |
147 | } | |
148 | ||
149 | if (need_in) | |
150 | close(fdin[0]); | |
151 | else if (cmd->in) | |
152 | close(cmd->in); | |
153 | ||
154 | if (need_out) | |
155 | close(fdout[1]); | |
156 | else if (cmd->out) | |
157 | close(cmd->out); | |
158 | ||
159 | if (need_err) | |
160 | close(fderr[1]); | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | static int wait_or_whine(pid_t pid) | |
166 | { | |
6e81c74c MH |
167 | char sbuf[STRERR_BUFSIZE]; |
168 | ||
07800601 IM |
169 | for (;;) { |
170 | int status, code; | |
171 | pid_t waiting = waitpid(pid, &status, 0); | |
172 | ||
173 | if (waiting < 0) { | |
174 | if (errno == EINTR) | |
175 | continue; | |
2f4ce5ec | 176 | fprintf(stderr, " Error: waitpid failed (%s)", |
07eebccb | 177 | str_error_r(errno, sbuf, sizeof(sbuf))); |
07800601 IM |
178 | return -ERR_RUN_COMMAND_WAITPID; |
179 | } | |
180 | if (waiting != pid) | |
181 | return -ERR_RUN_COMMAND_WAITPID_WRONG_PID; | |
182 | if (WIFSIGNALED(status)) | |
183 | return -ERR_RUN_COMMAND_WAITPID_SIGNAL; | |
184 | ||
185 | if (!WIFEXITED(status)) | |
186 | return -ERR_RUN_COMMAND_WAITPID_NOEXIT; | |
187 | code = WEXITSTATUS(status); | |
188 | switch (code) { | |
189 | case 127: | |
190 | return -ERR_RUN_COMMAND_EXEC; | |
191 | case 0: | |
192 | return 0; | |
193 | default: | |
194 | return -code; | |
195 | } | |
196 | } | |
197 | } | |
198 | ||
199 | int finish_command(struct child_process *cmd) | |
200 | { | |
201 | return wait_or_whine(cmd->pid); | |
202 | } | |
203 | ||
204 | int run_command(struct child_process *cmd) | |
205 | { | |
206 | int code = start_command(cmd); | |
207 | if (code) | |
208 | return code; | |
209 | return finish_command(cmd); | |
210 | } | |
211 | ||
212 | static void prepare_run_command_v_opt(struct child_process *cmd, | |
213 | const char **argv, | |
214 | int opt) | |
215 | { | |
216 | memset(cmd, 0, sizeof(*cmd)); | |
217 | cmd->argv = argv; | |
218 | cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; | |
46113a54 | 219 | cmd->exec_cmd = opt & RUN_EXEC_CMD ? 1 : 0; |
07800601 IM |
220 | cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; |
221 | } | |
222 | ||
223 | int run_command_v_opt(const char **argv, int opt) | |
224 | { | |
225 | struct child_process cmd; | |
226 | prepare_run_command_v_opt(&cmd, argv, opt); | |
227 | return run_command(&cmd); | |
228 | } |