1#ifndef RUN_COMMAND_H 2#define RUN_COMMAND_H 3 4enum { 5 ERR_RUN_COMMAND_FORK = 10000, 6 ERR_RUN_COMMAND_EXEC, 7 ERR_RUN_COMMAND_PIPE, 8 ERR_RUN_COMMAND_WAITPID, 9 ERR_RUN_COMMAND_WAITPID_WRONG_PID, 10 ERR_RUN_COMMAND_WAITPID_SIGNAL, 11 ERR_RUN_COMMAND_WAITPID_NOEXIT, 12}; 13#define IS_RUN_COMMAND_ERR(x) ((x) <= -ERR_RUN_COMMAND_FORK) 14 15struct child_process { 16 const char **argv; 17 pid_t pid; 18 /* 19 * Using .in, .out, .err: 20 * - Specify 0 for no redirections (child inherits stdin, stdout, 21 * stderr from parent). 22 * - Specify -1 to have a pipe allocated as follows: 23 * .in: returns the writable pipe end; parent writes to it, 24 * the readable pipe end becomes child's stdin 25 * .out, .err: returns the readable pipe end; parent reads from 26 * it, the writable pipe end becomes child's stdout/stderr 27 * The caller of start_command() must close the returned FDs 28 * after it has completed reading from/writing to it! 29 * - Specify > 0 to set a channel to a particular FD as follows: 30 * .in: a readable FD, becomes child's stdin 31 * .out: a writable FD, becomes child's stdout/stderr 32 * .err > 0 not supported 33 * The specified FD is closed by start_command(), even in case 34 * of errors! 35 */ 36 int in; 37 int out; 38 int err; 39 const char *dir; 40 const char *const *env; 41 unsigned no_stdin:1; 42 unsigned no_stdout:1; 43 unsigned no_stderr:1; 44 unsigned git_cmd:1; /* if this is to be git sub-command */ 45 unsigned stdout_to_stderr:1; 46 void (*preexec_cb)(void); 47}; 48 49int start_command(struct child_process *); 50int finish_command(struct child_process *); 51int run_command(struct child_process *); 52 53extern int run_hook(const char *index_file, const char *name, ...); 54 55#define RUN_COMMAND_NO_STDIN 1 56#define RUN_GIT_CMD 2 /*If this is to be git sub-command */ 57#define RUN_COMMAND_STDOUT_TO_STDERR 4 58int run_command_v_opt(const char **argv, int opt); 59 60/* 61 * env (the environment) is to be formatted like environ: "VAR=VALUE". 62 * To unset an environment variable use just "VAR". 63 */ 64int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env); 65 66/* 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. 69 * 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. 73 */ 74struct async { 75 /* 76 * proc writes to fd and closes it; 77 * returns 0 on success, non-zero on failure 78 */ 79 int (*proc)(int fd, void *data); 80 void *data; 81 int out; /* caller reads from here and closes it */ 82#ifndef __MINGW32__ 83 pid_t pid; 84#else 85 HANDLE tid; 86 int fd_for_proc; 87#endif 88}; 89 90int start_async(struct async *async); 91int finish_async(struct async *async); 92 93#endif