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struct child_process {
const char **argv;
pid_t pid;
* Using .in, .out, .err:
* - Specify 0 for no redirections (child inherits stdin, stdout,
* stderr from parent).
* - Specify -1 to have a pipe allocated as follows:
* .in: returns the writable pipe end; parent writes to it,
* the readable pipe end becomes child's stdin
* .out, .err: returns the readable pipe end; parent reads from
* it, the writable pipe end becomes child's stdout/stderr
* The caller of start_command() must close the returned FDs
* after it has completed reading from/writing to it!
* - Specify > 0 to set a channel to a particular FD as follows:
* .in: a readable FD, becomes child's stdin
* .out: a writable FD, becomes child's stdout/stderr
* .err: a writable FD, becomes child's stderr
* The specified FD is closed by start_command(), even in case
* of errors!
int in;
int out;
int err;
const char *dir;
const char *const *env;
unsigned no_stdin:1;
unsigned no_stdout:1;
unsigned no_stderr:1;
unsigned git_cmd:1; /* if this is to be git sub-command */
unsigned silent_exec_failure:1;
unsigned stdout_to_stderr:1;
unsigned use_shell:1;
void (*preexec_cb)(void);
int start_command(struct child_process *);
int finish_command(struct child_process *);
int run_command(struct child_process *);
extern int run_hook(const char *index_file, const char *name, ...);
#define RUN_GIT_CMD 2 /*If this is to be git sub-command */
#define RUN_USING_SHELL 16
int run_command_v_opt(const char **argv, int opt);
* env (the environment) is to be formatted like environ: "VAR=VALUE".
* To unset an environment variable use just "VAR".
int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env);
* The purpose of the following functions is to feed a pipe by running
* a function asynchronously and providing output that the caller reads.
* It is expected that no synchronization and mutual exclusion between
* the caller and the feed function is necessary so that the function
* can run in a thread without interfering with the caller.
struct async {
* proc reads from in; closes it before return
* proc writes to out; closes it before return
* returns 0 on success, non-zero on failure
int (*proc)(int in, int out, void *data);
void *data;
int in; /* caller writes here and closes it */
int out; /* caller reads from here and closes it */
#ifndef WIN32
pid_t pid;
int proc_in;
int proc_out;
int start_async(struct async *async);
int finish_async(struct async *async);
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