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[alt-git.git] / run-command.h
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1 #ifndef RUN_COMMAND_H
2 #define RUN_COMMAND_H
4 #ifndef NO_PTHREADS
5 #include <pthread.h>
6 #endif
8 struct child_process {
9 const char **argv;
10 pid_t pid;
12 * Using .in, .out, .err:
13 * - Specify 0 for no redirections (child inherits stdin, stdout,
14 * stderr from parent).
15 * - Specify -1 to have a pipe allocated as follows:
16 * .in: returns the writable pipe end; parent writes to it,
17 * the readable pipe end becomes child's stdin
18 * .out, .err: returns the readable pipe end; parent reads from
19 * it, the writable pipe end becomes child's stdout/stderr
20 * The caller of start_command() must close the returned FDs
21 * after it has completed reading from/writing to it!
22 * - Specify > 0 to set a channel to a particular FD as follows:
23 * .in: a readable FD, becomes child's stdin
24 * .out: a writable FD, becomes child's stdout/stderr
25 * .err: a writable FD, becomes child's stderr
26 * The specified FD is closed by start_command(), even in case
27 * of errors!
29 int in;
30 int out;
31 int err;
32 const char *dir;
33 const char *const *env;
34 unsigned no_stdin:1;
35 unsigned no_stdout:1;
36 unsigned no_stderr:1;
37 unsigned git_cmd:1; /* if this is to be git sub-command */
38 unsigned silent_exec_failure:1;
39 unsigned stdout_to_stderr:1;
40 unsigned use_shell:1;
41 unsigned clean_on_exit:1;
44 int start_command(struct child_process *);
45 int finish_command(struct child_process *);
46 int run_command(struct child_process *);
48 extern char *find_hook(const char *name);
49 LAST_ARG_MUST_BE_NULL
50 extern int run_hook(const char *index_file, const char *name, ...);
52 #define RUN_COMMAND_NO_STDIN 1
53 #define RUN_GIT_CMD 2 /*If this is to be git sub-command */
54 #define RUN_COMMAND_STDOUT_TO_STDERR 4
55 #define RUN_SILENT_EXEC_FAILURE 8
56 #define RUN_USING_SHELL 16
57 #define RUN_CLEAN_ON_EXIT 32
58 int run_command_v_opt(const char **argv, int opt);
61 * env (the environment) is to be formatted like environ: "VAR=VALUE".
62 * To unset an environment variable use just "VAR".
64 int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env);
67 * The purpose of the following functions is to feed a pipe by running
68 * a function asynchronously and providing output that the caller reads.
70 * It is expected that no synchronization and mutual exclusion between
71 * the caller and the feed function is necessary so that the function
72 * can run in a thread without interfering with the caller.
74 struct async {
76 * proc reads from in; closes it before return
77 * proc writes to out; closes it before return
78 * returns 0 on success, non-zero on failure
80 int (*proc)(int in, int out, void *data);
81 void *data;
82 int in; /* caller writes here and closes it */
83 int out; /* caller reads from here and closes it */
84 #ifdef NO_PTHREADS
85 pid_t pid;
86 #else
87 pthread_t tid;
88 int proc_in;
89 int proc_out;
90 #endif
93 int start_async(struct async *async);
94 int finish_async(struct async *async);
96 #endif