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: a writable FD, becomes child's stderr 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 silent_exec_failure:1; 35 unsigned stdout_to_stderr:1; 36 unsigned use_shell:1; 37 void (*preexec_cb)(void); 38}; 39 40int start_command(struct child_process *); 41int finish_command(struct child_process *); 42int run_command(struct child_process *); 43 44extern int run_hook(const char *index_file, const char *name, ...); 45 46#define RUN_COMMAND_NO_STDIN 1 47#define RUN_GIT_CMD 2 /*If this is to be git sub-command */ 48#define RUN_COMMAND_STDOUT_TO_STDERR 4 49#define RUN_SILENT_EXEC_FAILURE 8 50#define RUN_USING_SHELL 16 51int run_command_v_opt(const char **argv, int opt); 52 53/* 54 * env (the environment) is to be formatted like environ: "VAR=VALUE". 55 * To unset an environment variable use just "VAR". 56 */ 57int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env); 58 59/* 60 * The purpose of the following functions is to feed a pipe by running 61 * a function asynchronously and providing output that the caller reads. 62 * 63 * It is expected that no synchronization and mutual exclusion between 64 * the caller and the feed function is necessary so that the function 65 * can run in a thread without interfering with the caller. 66 */ 67struct async { 68 /* 69 * proc reads from in; closes it before return 70 * proc writes to out; closes it before return 71 * returns 0 on success, non-zero on failure 72 */ 73 int (*proc)(int in, int out, void *data); 74 void *data; 75 int in; /* caller writes here and closes it */ 76 int out; /* caller reads from here and closes it */ 77#ifndef WIN32 78 pid_t pid; 79#else 80 HANDLE tid; 81 int proc_in; 82 int proc_out; 83#endif 84}; 85 86int start_async(struct async *async); 87int finish_async(struct async *async); 88 89#endif