1#ifndef RUN_COMMAND_H 2#define RUN_COMMAND_H 3 4struct child_process { 5 const char **argv; 6 pid_t pid; 7 /* 8 * Using .in, .out, .err: 9 * - Specify 0 for no redirections (child inherits stdin, stdout, 10 * stderr from parent). 11 * - Specify -1 to have a pipe allocated as follows: 12 * .in: returns the writable pipe end; parent writes to it, 13 * the readable pipe end becomes child's stdin 14 * .out, .err: returns the readable pipe end; parent reads from 15 * it, the writable pipe end becomes child's stdout/stderr 16 * The caller of start_command() must close the returned FDs 17 * after it has completed reading from/writing to it! 18 * - Specify > 0 to set a channel to a particular FD as follows: 19 * .in: a readable FD, becomes child's stdin 20 * .out: a writable FD, becomes child's stdout/stderr 21 * .err > 0 not supported 22 * The specified FD is closed by start_command(), even in case 23 * of errors! 24 */ 25 int in; 26 int out; 27 int err; 28 const char *dir; 29 const char *const *env; 30 unsigned no_stdin:1; 31 unsigned no_stdout:1; 32 unsigned no_stderr:1; 33 unsigned git_cmd:1; /* if this is to be git sub-command */ 34 unsigned stdout_to_stderr:1; 35 void (*preexec_cb)(void); 36}; 37 38int start_command(struct child_process *); 39int finish_command(struct child_process *); 40int run_command(struct child_process *); 41 42extern int run_hook(const char *index_file, const char *name, ...); 43 44#define RUN_COMMAND_NO_STDIN 1 45#define RUN_GIT_CMD 2 /*If this is to be git sub-command */ 46#define RUN_COMMAND_STDOUT_TO_STDERR 4 47int run_command_v_opt(const char **argv, int opt); 48 49/* 50 * env (the environment) is to be formatted like environ: "VAR=VALUE". 51 * To unset an environment variable use just "VAR". 52 */ 53int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env); 54 55/* 56 * The purpose of the following functions is to feed a pipe by running 57 * a function asynchronously and providing output that the caller reads. 58 * 59 * It is expected that no synchronization and mutual exclusion between 60 * the caller and the feed function is necessary so that the function 61 * can run in a thread without interfering with the caller. 62 */ 63struct async { 64 /* 65 * proc writes to fd and closes it; 66 * returns 0 on success, non-zero on failure 67 */ 68 int (*proc)(int fd, void *data); 69 void *data; 70 int out; /* caller reads from here and closes it */ 71#ifndef __MINGW32__ 72 pid_t pid; 73#else 74 HANDLE tid; 75 int fd_for_proc; 76#endif 77}; 78 79int start_async(struct async *async); 80int finish_async(struct async *async); 81 82#endif