1#ifndef __SUBCMD_RUN_COMMAND_H 2#define __SUBCMD_RUN_COMMAND_H 3 4#include <unistd.h> 5 6enum { 7 ERR_RUN_COMMAND_FORK = 10000, 8 ERR_RUN_COMMAND_EXEC, 9 ERR_RUN_COMMAND_PIPE, 10 ERR_RUN_COMMAND_WAITPID, 11 ERR_RUN_COMMAND_WAITPID_WRONG_PID, 12 ERR_RUN_COMMAND_WAITPID_SIGNAL, 13 ERR_RUN_COMMAND_WAITPID_NOEXIT, 14}; 15#define IS_RUN_COMMAND_ERR(x) (-(x) >= ERR_RUN_COMMAND_FORK) 16 17struct child_process { 18 const char **argv; 19 pid_t pid; 20 /* 21 * Using .in, .out, .err: 22 * - Specify 0 for no redirections (child inherits stdin, stdout, 23 * stderr from parent). 24 * - Specify -1 to have a pipe allocated as follows: 25 * .in: returns the writable pipe end; parent writes to it, 26 * the readable pipe end becomes child's stdin 27 * .out, .err: returns the readable pipe end; parent reads from 28 * it, the writable pipe end becomes child's stdout/stderr 29 * The caller of start_command() must close the returned FDs 30 * after it has completed reading from/writing to it! 31 * - Specify > 0 to set a channel to a particular FD as follows: 32 * .in: a readable FD, becomes child's stdin 33 * .out: a writable FD, becomes child's stdout/stderr 34 * .err > 0 not supported 35 * The specified FD is closed by start_command(), even in case 36 * of errors! 37 */ 38 int in; 39 int out; 40 int err; 41 const char *dir; 42 const char *const *env; 43 unsigned no_stdin:1; 44 unsigned no_stdout:1; 45 unsigned no_stderr:1; 46 unsigned exec_cmd:1; /* if this is to be external sub-command */ 47 unsigned stdout_to_stderr:1; 48 void (*preexec_cb)(void); 49}; 50 51int start_command(struct child_process *); 52int finish_command(struct child_process *); 53int run_command(struct child_process *); 54 55#define RUN_COMMAND_NO_STDIN 1 56#define RUN_EXEC_CMD 2 /*If this is to be external sub-command */ 57#define RUN_COMMAND_STDOUT_TO_STDERR 4 58int run_command_v_opt(const char **argv, int opt); 59 60#endif /* __SUBCMD_RUN_COMMAND_H */ 61