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