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1 | #ifndef RUN_COMMAND_H | |
2 | #define RUN_COMMAND_H | |
3 | ||
4 | #include "thread-utils.h" | |
5 | ||
6 | #include "argv-array.h" | |
7 | ||
8 | struct child_process { | |
9 | const char **argv; | |
10 | struct argv_array args; | |
11 | struct argv_array env_array; | |
12 | pid_t pid; | |
13 | ||
14 | int trace2_child_id; | |
15 | uint64_t trace2_child_us_start; | |
16 | const char *trace2_child_class; | |
17 | const char *trace2_hook_name; | |
18 | ||
19 | /* | |
20 | * Using .in, .out, .err: | |
21 | * - Specify 0 for no redirections (child inherits stdin, stdout, | |
22 | * stderr from parent). | |
23 | * - Specify -1 to have a pipe allocated as follows: | |
24 | * .in: returns the writable pipe end; parent writes to it, | |
25 | * the readable pipe end becomes child's stdin | |
26 | * .out, .err: returns the readable pipe end; parent reads from | |
27 | * it, the writable pipe end becomes child's stdout/stderr | |
28 | * The caller of start_command() must close the returned FDs | |
29 | * after it has completed reading from/writing to it! | |
30 | * - Specify > 0 to set a channel to a particular FD as follows: | |
31 | * .in: a readable FD, becomes child's stdin | |
32 | * .out: a writable FD, becomes child's stdout/stderr | |
33 | * .err: a writable FD, becomes child's stderr | |
34 | * The specified FD is closed by start_command(), even in case | |
35 | * of errors! | |
36 | */ | |
37 | int in; | |
38 | int out; | |
39 | int err; | |
40 | const char *dir; | |
41 | const char *const *env; | |
42 | unsigned no_stdin:1; | |
43 | unsigned no_stdout:1; | |
44 | unsigned no_stderr:1; | |
45 | unsigned git_cmd:1; /* if this is to be git sub-command */ | |
46 | unsigned silent_exec_failure:1; | |
47 | unsigned stdout_to_stderr:1; | |
48 | unsigned use_shell:1; | |
49 | unsigned clean_on_exit:1; | |
50 | unsigned wait_after_clean:1; | |
51 | void (*clean_on_exit_handler)(struct child_process *process); | |
52 | void *clean_on_exit_handler_cbdata; | |
53 | }; | |
54 | ||
55 | #define CHILD_PROCESS_INIT { NULL, ARGV_ARRAY_INIT, ARGV_ARRAY_INIT } | |
56 | void child_process_init(struct child_process *); | |
57 | void child_process_clear(struct child_process *); | |
58 | extern int is_executable(const char *name); | |
59 | ||
60 | int start_command(struct child_process *); | |
61 | int finish_command(struct child_process *); | |
62 | int finish_command_in_signal(struct child_process *); | |
63 | int run_command(struct child_process *); | |
64 | ||
65 | /* | |
66 | * Returns the path to the hook file, or NULL if the hook is missing | |
67 | * or disabled. Note that this points to static storage that will be | |
68 | * overwritten by further calls to find_hook and run_hook_*. | |
69 | */ | |
70 | extern const char *find_hook(const char *name); | |
71 | LAST_ARG_MUST_BE_NULL | |
72 | extern int run_hook_le(const char *const *env, const char *name, ...); | |
73 | extern int run_hook_ve(const char *const *env, const char *name, va_list args); | |
74 | ||
75 | #define RUN_COMMAND_NO_STDIN 1 | |
76 | #define RUN_GIT_CMD 2 /*If this is to be git sub-command */ | |
77 | #define RUN_COMMAND_STDOUT_TO_STDERR 4 | |
78 | #define RUN_SILENT_EXEC_FAILURE 8 | |
79 | #define RUN_USING_SHELL 16 | |
80 | #define RUN_CLEAN_ON_EXIT 32 | |
81 | int run_command_v_opt(const char **argv, int opt); | |
82 | int run_command_v_opt_tr2(const char **argv, int opt, const char *tr2_class); | |
83 | /* | |
84 | * env (the environment) is to be formatted like environ: "VAR=VALUE". | |
85 | * To unset an environment variable use just "VAR". | |
86 | */ | |
87 | int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env); | |
88 | int run_command_v_opt_cd_env_tr2(const char **argv, int opt, const char *dir, | |
89 | const char *const *env, const char *tr2_class); | |
90 | ||
91 | /** | |
92 | * Execute the given command, sending "in" to its stdin, and capturing its | |
93 | * stdout and stderr in the "out" and "err" strbufs. Any of the three may | |
94 | * be NULL to skip processing. | |
95 | * | |
96 | * Returns -1 if starting the command fails or reading fails, and otherwise | |
97 | * returns the exit code of the command. Any output collected in the | |
98 | * buffers is kept even if the command returns a non-zero exit. The hint fields | |
99 | * gives starting sizes for the strbuf allocations. | |
100 | * | |
101 | * The fields of "cmd" should be set up as they would for a normal run_command | |
102 | * invocation. But note that there is no need to set the in, out, or err | |
103 | * fields; pipe_command handles that automatically. | |
104 | */ | |
105 | int pipe_command(struct child_process *cmd, | |
106 | const char *in, size_t in_len, | |
107 | struct strbuf *out, size_t out_hint, | |
108 | struct strbuf *err, size_t err_hint); | |
109 | ||
110 | /** | |
111 | * Convenience wrapper around pipe_command for the common case | |
112 | * of capturing only stdout. | |
113 | */ | |
114 | static inline int capture_command(struct child_process *cmd, | |
115 | struct strbuf *out, | |
116 | size_t hint) | |
117 | { | |
118 | return pipe_command(cmd, NULL, 0, out, hint, NULL, 0); | |
119 | } | |
120 | ||
121 | /* | |
122 | * The purpose of the following functions is to feed a pipe by running | |
123 | * a function asynchronously and providing output that the caller reads. | |
124 | * | |
125 | * It is expected that no synchronization and mutual exclusion between | |
126 | * the caller and the feed function is necessary so that the function | |
127 | * can run in a thread without interfering with the caller. | |
128 | */ | |
129 | struct async { | |
130 | /* | |
131 | * proc reads from in; closes it before return | |
132 | * proc writes to out; closes it before return | |
133 | * returns 0 on success, non-zero on failure | |
134 | */ | |
135 | int (*proc)(int in, int out, void *data); | |
136 | void *data; | |
137 | int in; /* caller writes here and closes it */ | |
138 | int out; /* caller reads from here and closes it */ | |
139 | #ifdef NO_PTHREADS | |
140 | pid_t pid; | |
141 | #else | |
142 | pthread_t tid; | |
143 | int proc_in; | |
144 | int proc_out; | |
145 | #endif | |
146 | int isolate_sigpipe; | |
147 | }; | |
148 | ||
149 | int start_async(struct async *async); | |
150 | int finish_async(struct async *async); | |
151 | int in_async(void); | |
152 | int async_with_fork(void); | |
153 | void check_pipe(int err); | |
154 | ||
155 | /** | |
156 | * This callback should initialize the child process and preload the | |
157 | * error channel if desired. The preloading of is useful if you want to | |
158 | * have a message printed directly before the output of the child process. | |
159 | * pp_cb is the callback cookie as passed to run_processes_parallel. | |
160 | * You can store a child process specific callback cookie in pp_task_cb. | |
161 | * | |
162 | * Even after returning 0 to indicate that there are no more processes, | |
163 | * this function will be called again until there are no more running | |
164 | * child processes. | |
165 | * | |
166 | * Return 1 if the next child is ready to run. | |
167 | * Return 0 if there are currently no more tasks to be processed. | |
168 | * To send a signal to other child processes for abortion, | |
169 | * return the negative signal number. | |
170 | */ | |
171 | typedef int (*get_next_task_fn)(struct child_process *cp, | |
172 | struct strbuf *out, | |
173 | void *pp_cb, | |
174 | void **pp_task_cb); | |
175 | ||
176 | /** | |
177 | * This callback is called whenever there are problems starting | |
178 | * a new process. | |
179 | * | |
180 | * You must not write to stdout or stderr in this function. Add your | |
181 | * message to the strbuf out instead, which will be printed without | |
182 | * messing up the output of the other parallel processes. | |
183 | * | |
184 | * pp_cb is the callback cookie as passed into run_processes_parallel, | |
185 | * pp_task_cb is the callback cookie as passed into get_next_task_fn. | |
186 | * | |
187 | * Return 0 to continue the parallel processing. To abort return non zero. | |
188 | * To send a signal to other child processes for abortion, return | |
189 | * the negative signal number. | |
190 | */ | |
191 | typedef int (*start_failure_fn)(struct strbuf *out, | |
192 | void *pp_cb, | |
193 | void *pp_task_cb); | |
194 | ||
195 | /** | |
196 | * This callback is called on every child process that finished processing. | |
197 | * | |
198 | * You must not write to stdout or stderr in this function. Add your | |
199 | * message to the strbuf out instead, which will be printed without | |
200 | * messing up the output of the other parallel processes. | |
201 | * | |
202 | * pp_cb is the callback cookie as passed into run_processes_parallel, | |
203 | * pp_task_cb is the callback cookie as passed into get_next_task_fn. | |
204 | * | |
205 | * Return 0 to continue the parallel processing. To abort return non zero. | |
206 | * To send a signal to other child processes for abortion, return | |
207 | * the negative signal number. | |
208 | */ | |
209 | typedef int (*task_finished_fn)(int result, | |
210 | struct strbuf *out, | |
211 | void *pp_cb, | |
212 | void *pp_task_cb); | |
213 | ||
214 | /** | |
215 | * Runs up to n processes at the same time. Whenever a process can be | |
216 | * started, the callback get_next_task_fn is called to obtain the data | |
217 | * required to start another child process. | |
218 | * | |
219 | * The children started via this function run in parallel. Their output | |
220 | * (both stdout and stderr) is routed to stderr in a manner that output | |
221 | * from different tasks does not interleave. | |
222 | * | |
223 | * start_failure_fn and task_finished_fn can be NULL to omit any | |
224 | * special handling. | |
225 | */ | |
226 | int run_processes_parallel(int n, | |
227 | get_next_task_fn, | |
228 | start_failure_fn, | |
229 | task_finished_fn, | |
230 | void *pp_cb); | |
231 | int run_processes_parallel_tr2(int n, get_next_task_fn, start_failure_fn, | |
232 | task_finished_fn, void *pp_cb, | |
233 | const char *tr2_category, const char *tr2_label); | |
234 | ||
235 | #endif |