git-multimail: update to release 1.2.0
[git.git] / run-command.h
blob5428b048e2c49dec3e322ac2a46ffddd012e4c8d
1 #ifndef RUN_COMMAND_H
2 #define RUN_COMMAND_H
4 #ifndef NO_PTHREADS
5 #include <pthread.h>
6 #endif
8 #include "argv-array.h"
10 struct child_process {
11 const char **argv;
12 struct argv_array args;
13 struct argv_array env_array;
14 pid_t pid;
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
29 * .err: a writable FD, becomes child's stderr
30 * The specified FD is closed by start_command(), even in case
31 * of errors!
33 int in;
34 int out;
35 int err;
36 const char *dir;
37 const char *const *env;
38 unsigned no_stdin:1;
39 unsigned no_stdout:1;
40 unsigned no_stderr:1;
41 unsigned git_cmd:1; /* if this is to be git sub-command */
42 unsigned silent_exec_failure:1;
43 unsigned stdout_to_stderr:1;
44 unsigned use_shell:1;
45 unsigned clean_on_exit:1;
48 #define CHILD_PROCESS_INIT { NULL, ARGV_ARRAY_INIT, ARGV_ARRAY_INIT }
49 void child_process_init(struct child_process *);
51 int start_command(struct child_process *);
52 int finish_command(struct child_process *);
53 int finish_command_in_signal(struct child_process *);
54 int run_command(struct child_process *);
57 * Returns the path to the hook file, or NULL if the hook is missing
58 * or disabled. Note that this points to static storage that will be
59 * overwritten by further calls to find_hook and run_hook_*.
61 extern const char *find_hook(const char *name);
62 LAST_ARG_MUST_BE_NULL
63 extern int run_hook_le(const char *const *env, const char *name, ...);
64 extern int run_hook_ve(const char *const *env, const char *name, va_list args);
66 #define RUN_COMMAND_NO_STDIN 1
67 #define RUN_GIT_CMD 2 /*If this is to be git sub-command */
68 #define RUN_COMMAND_STDOUT_TO_STDERR 4
69 #define RUN_SILENT_EXEC_FAILURE 8
70 #define RUN_USING_SHELL 16
71 #define RUN_CLEAN_ON_EXIT 32
72 int run_command_v_opt(const char **argv, int opt);
75 * env (the environment) is to be formatted like environ: "VAR=VALUE".
76 * To unset an environment variable use just "VAR".
78 int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env);
80 /**
81 * Execute the given command, capturing its stdout in the given strbuf.
82 * Returns -1 if starting the command fails or reading fails, and otherwise
83 * returns the exit code of the command. The output collected in the
84 * buffer is kept even if the command returns a non-zero exit. The hint field
85 * gives a starting size for the strbuf allocation.
87 * The fields of "cmd" should be set up as they would for a normal run_command
88 * invocation. But note that there is no need to set cmd->out; the function
89 * sets it up for the caller.
91 int capture_command(struct child_process *cmd, struct strbuf *buf, size_t hint);
94 * The purpose of the following functions is to feed a pipe by running
95 * a function asynchronously and providing output that the caller reads.
97 * It is expected that no synchronization and mutual exclusion between
98 * the caller and the feed function is necessary so that the function
99 * can run in a thread without interfering with the caller.
101 struct async {
103 * proc reads from in; closes it before return
104 * proc writes to out; closes it before return
105 * returns 0 on success, non-zero on failure
107 int (*proc)(int in, int out, void *data);
108 void *data;
109 int in; /* caller writes here and closes it */
110 int out; /* caller reads from here and closes it */
111 #ifdef NO_PTHREADS
112 pid_t pid;
113 #else
114 pthread_t tid;
115 int proc_in;
116 int proc_out;
117 #endif
120 int start_async(struct async *async);
121 int finish_async(struct async *async);
122 int in_async(void);
124 #endif