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 14struct child_process { 15 const char **argv; 16 pid_t pid; 17 /* 18 * Using .in, .out, .err: 19 * - Specify 0 for no redirections (child inherits stdin, stdout, 20 * stderr from parent). 21 * - Specify -1 to have a pipe allocated as follows: 22 * .in: returns the writable pipe end; parent writes to it, 23 * the readable pipe end becomes child's stdin 24 * .out, .err: returns the readable pipe end; parent reads from 25 * it, the writable pipe end becomes child's stdout/stderr 26 * The caller of start_command() must close the returned FDs 27 * after it has completed reading from/writing to it! 28 * - Specify > 0 to set a channel to a particular FD as follows: 29 * .in: a readable FD, becomes child's stdin 30 * .out: a writable FD, becomes child's stdout/stderr 31 * .err > 0 not supported 32 * The specified FD is closed by start_command(), even in case 33 * of errors! 34 */ 35 int in; 36 int out; 37 int err; 38 const char *dir; 39 const char *const *env; 40 unsigned no_stdin:1; 41 unsigned no_stdout:1; 42 unsigned no_stderr:1; 43 unsigned git_cmd:1; /* if this is to be git sub-command */ 44 unsigned stdout_to_stderr:1; 45}; 46 47int start_command(struct child_process *); 48int finish_command(struct child_process *); 49int run_command(struct child_process *); 50 51#define RUN_COMMAND_NO_STDIN 1 52#define RUN_GIT_CMD 2 /*If this is to be git sub-command */ 53#define RUN_COMMAND_STDOUT_TO_STDERR 4 54int run_command_v_opt(const char **argv, int opt); 55int run_command_v_opt_cd(const char **argv, int opt, const char *dir); 56 57/* 58 * env (the environment) is to be formatted like environ: "VAR=VALUE". 59 * To unset an environment variable use just "VAR". 60 */ 61int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env); 62 63/* 64 * The purpose of the following functions is to feed a pipe by running 65 * a function asynchronously and providing output that the caller reads. 66 * 67 * It is expected that no synchronization and mutual exclusion between 68 * the caller and the feed function is necessary so that the function 69 * can run in a thread without interfering with the caller. 70 */ 71struct async { 72 /* 73 * proc writes to fd and closes it; 74 * returns 0 on success, non-zero on failure 75 */ 76 int (*proc)(int fd, void *data); 77 void *data; 78 int out; /* caller reads from here and closes it */ 79#ifndef __MINGW32__ 80 pid_t pid; 81#else 82 HANDLE tid; 83 int fd_for_proc; 84#endif 85}; 86 87int start_async(struct async *async); 88int finish_async(struct async *async); 89 90#endif