thread-utils: macros to unconditionally compile pthreads API
[git/git.git] / run-command.h
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1#ifndef RUN_COMMAND_H
2#define RUN_COMMAND_H
3
f6b60983 4#ifndef NO_PTHREADS
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5#include <pthread.h>
6#endif
7
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8#include "argv-array.h"
9
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10struct child_process {
11 const char **argv;
c460c0ec 12 struct argv_array args;
19a583dc 13 struct argv_array env_array;
ebcb5d16 14 pid_t pid;
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15 /*
16 * Using .in, .out, .err:
17 * - Specify 0 for no redirections (child inherits stdin, stdout,
18 * stderr from parent).
19 * - Specify -1 to have a pipe allocated as follows:
20 * .in: returns the writable pipe end; parent writes to it,
21 * the readable pipe end becomes child's stdin
22 * .out, .err: returns the readable pipe end; parent reads from
23 * it, the writable pipe end becomes child's stdout/stderr
24 * The caller of start_command() must close the returned FDs
25 * after it has completed reading from/writing to it!
26 * - Specify > 0 to set a channel to a particular FD as follows:
27 * .in: a readable FD, becomes child's stdin
28 * .out: a writable FD, becomes child's stdout/stderr
4f41b611 29 * .err: a writable FD, becomes child's stderr
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30 * The specified FD is closed by start_command(), even in case
31 * of errors!
32 */
4919bf03 33 int in;
f4bba25b 34 int out;
f3b33f1d 35 int err;
1568fea0 36 const char *dir;
ee493148 37 const char *const *env;
f1000898 38 unsigned no_stdin:1;
e4507ae8 39 unsigned no_stdout:1;
b73a4397 40 unsigned no_stderr:1;
f1000898 41 unsigned git_cmd:1; /* if this is to be git sub-command */
c024beb5 42 unsigned silent_exec_failure:1;
f1000898 43 unsigned stdout_to_stderr:1;
8dba1e63 44 unsigned use_shell:1;
afe19ff7 45 unsigned clean_on_exit:1;
46df6906 46 unsigned wait_after_clean:1;
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47 void (*clean_on_exit_handler)(struct child_process *process);
48 void *clean_on_exit_handler_cbdata;
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49};
50
19a583dc 51#define CHILD_PROCESS_INIT { NULL, ARGV_ARRAY_INIT, ARGV_ARRAY_INIT }
483bbd4e 52void child_process_init(struct child_process *);
2d71608e 53void child_process_clear(struct child_process *);
38124a40 54extern int is_executable(const char *name);
d3180279 55
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56int start_command(struct child_process *);
57int finish_command(struct child_process *);
507d7804 58int finish_command_in_signal(struct child_process *);
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59int run_command(struct child_process *);
60
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61/*
62 * Returns the path to the hook file, or NULL if the hook is missing
63 * or disabled. Note that this points to static storage that will be
64 * overwritten by further calls to find_hook and run_hook_*.
65 */
dcf69262 66extern const char *find_hook(const char *name);
9fe3edc4 67LAST_ARG_MUST_BE_NULL
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68extern int run_hook_le(const char *const *env, const char *name, ...);
69extern int run_hook_ve(const char *const *env, const char *name, va_list args);
70
95d3c4f5 71#define RUN_COMMAND_NO_STDIN 1
77cb17e9 72#define RUN_GIT_CMD 2 /*If this is to be git sub-command */
cd83c74c 73#define RUN_COMMAND_STDOUT_TO_STDERR 4
c024beb5 74#define RUN_SILENT_EXEC_FAILURE 8
8dba1e63 75#define RUN_USING_SHELL 16
10c6cddd 76#define RUN_CLEAN_ON_EXIT 32
9b0b5093 77int run_command_v_opt(const char **argv, int opt);
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78
79/*
80 * env (the environment) is to be formatted like environ: "VAR=VALUE".
81 * To unset an environment variable use just "VAR".
82 */
ee493148 83int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env);
b1bf95bb 84
911ec99b 85/**
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86 * Execute the given command, sending "in" to its stdin, and capturing its
87 * stdout and stderr in the "out" and "err" strbufs. Any of the three may
88 * be NULL to skip processing.
89 *
911ec99b 90 * Returns -1 if starting the command fails or reading fails, and otherwise
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91 * returns the exit code of the command. Any output collected in the
92 * buffers is kept even if the command returns a non-zero exit. The hint fields
93 * gives starting sizes for the strbuf allocations.
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94 *
95 * The fields of "cmd" should be set up as they would for a normal run_command
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96 * invocation. But note that there is no need to set the in, out, or err
97 * fields; pipe_command handles that automatically.
98 */
99int pipe_command(struct child_process *cmd,
100 const char *in, size_t in_len,
101 struct strbuf *out, size_t out_hint,
102 struct strbuf *err, size_t err_hint);
103
104/**
105 * Convenience wrapper around pipe_command for the common case
106 * of capturing only stdout.
911ec99b 107 */
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108static inline int capture_command(struct child_process *cmd,
109 struct strbuf *out,
110 size_t hint)
111{
112 return pipe_command(cmd, NULL, 0, out, hint, NULL, 0);
113}
911ec99b 114
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115/*
116 * The purpose of the following functions is to feed a pipe by running
117 * a function asynchronously and providing output that the caller reads.
118 *
119 * It is expected that no synchronization and mutual exclusion between
120 * the caller and the feed function is necessary so that the function
121 * can run in a thread without interfering with the caller.
122 */
123struct async {
124 /*
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125 * proc reads from in; closes it before return
126 * proc writes to out; closes it before return
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127 * returns 0 on success, non-zero on failure
128 */
ae6a5609 129 int (*proc)(int in, int out, void *data);
2d22c208 130 void *data;
ae6a5609 131 int in; /* caller writes here and closes it */
2d22c208 132 int out; /* caller reads from here and closes it */
f6b60983 133#ifdef NO_PTHREADS
2d22c208 134 pid_t pid;
618ebe9f 135#else
200a76b7 136 pthread_t tid;
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137 int proc_in;
138 int proc_out;
618ebe9f 139#endif
c792d7b6 140 int isolate_sigpipe;
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141};
142
143int start_async(struct async *async);
144int finish_async(struct async *async);
661a8cf4 145int in_async(void);
b992fe10 146void check_pipe(int err);
2d22c208 147
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148/**
149 * This callback should initialize the child process and preload the
150 * error channel if desired. The preloading of is useful if you want to
151 * have a message printed directly before the output of the child process.
152 * pp_cb is the callback cookie as passed to run_processes_parallel.
153 * You can store a child process specific callback cookie in pp_task_cb.
154 *
155 * Even after returning 0 to indicate that there are no more processes,
156 * this function will be called again until there are no more running
157 * child processes.
158 *
159 * Return 1 if the next child is ready to run.
160 * Return 0 if there are currently no more tasks to be processed.
161 * To send a signal to other child processes for abortion,
162 * return the negative signal number.
163 */
164typedef int (*get_next_task_fn)(struct child_process *cp,
aa710494 165 struct strbuf *out,
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166 void *pp_cb,
167 void **pp_task_cb);
168
169/**
170 * This callback is called whenever there are problems starting
171 * a new process.
172 *
173 * You must not write to stdout or stderr in this function. Add your
aa710494 174 * message to the strbuf out instead, which will be printed without
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175 * messing up the output of the other parallel processes.
176 *
177 * pp_cb is the callback cookie as passed into run_processes_parallel,
178 * pp_task_cb is the callback cookie as passed into get_next_task_fn.
179 *
180 * Return 0 to continue the parallel processing. To abort return non zero.
181 * To send a signal to other child processes for abortion, return
182 * the negative signal number.
183 */
aa710494 184typedef int (*start_failure_fn)(struct strbuf *out,
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185 void *pp_cb,
186 void *pp_task_cb);
187
188/**
189 * This callback is called on every child process that finished processing.
190 *
191 * You must not write to stdout or stderr in this function. Add your
aa710494 192 * message to the strbuf out instead, which will be printed without
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193 * messing up the output of the other parallel processes.
194 *
195 * pp_cb is the callback cookie as passed into run_processes_parallel,
196 * pp_task_cb is the callback cookie as passed into get_next_task_fn.
197 *
198 * Return 0 to continue the parallel processing. To abort return non zero.
199 * To send a signal to other child processes for abortion, return
200 * the negative signal number.
201 */
202typedef int (*task_finished_fn)(int result,
aa710494 203 struct strbuf *out,
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204 void *pp_cb,
205 void *pp_task_cb);
206
207/**
208 * Runs up to n processes at the same time. Whenever a process can be
209 * started, the callback get_next_task_fn is called to obtain the data
210 * required to start another child process.
211 *
212 * The children started via this function run in parallel. Their output
213 * (both stdout and stderr) is routed to stderr in a manner that output
214 * from different tasks does not interleave.
215 *
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216 * start_failure_fn and task_finished_fn can be NULL to omit any
217 * special handling.
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218 */
219int run_processes_parallel(int n,
220 get_next_task_fn,
221 start_failure_fn,
222 task_finished_fn,
223 void *pp_cb);
224
b1bf95bb 225#endif