1#ifndef RUN_COMMAND_H 2#define RUN_COMMAND_H 3 4#ifndef NO_PTHREADS 5#include <pthread.h> 6#endif 7 8struct child_process { 9 const char **argv; 10 pid_t pid; 11 /* 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! 28 */ 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; 42}; 43 44int start_command(struct child_process *); 45int finish_command(struct child_process *); 46int run_command(struct child_process *); 47 48extern char *find_hook(const char *name); 49__attribute__((sentinel)) 50extern int run_hook(const char *index_file, const char *name, ...); 51 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 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 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 79 */ 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 91}; 92 93int start_async(struct async *async); 94int finish_async(struct async *async); 95 96#endif