1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __SUBCMD_RUN_COMMAND_H 3 #define __SUBCMD_RUN_COMMAND_H 4 5 #include <unistd.h> 6 7 enum { 8 ERR_RUN_COMMAND_FORK = 10000, 9 ERR_RUN_COMMAND_EXEC, 10 ERR_RUN_COMMAND_PIPE, 11 ERR_RUN_COMMAND_WAITPID, 12 ERR_RUN_COMMAND_WAITPID_WRONG_PID, 13 ERR_RUN_COMMAND_WAITPID_SIGNAL, 14 ERR_RUN_COMMAND_WAITPID_NOEXIT, 15 }; 16 #define IS_RUN_COMMAND_ERR(x) (-(x) >= ERR_RUN_COMMAND_FORK) 17 18 struct child_process { 19 const char **argv; 20 pid_t pid; 21 /* 22 * Using .in, .out, .err: 23 * - Specify 0 for no redirections (child inherits stdin, stdout, 24 * stderr from parent). 25 * - Specify -1 to have a pipe allocated as follows: 26 * .in: returns the writable pipe end; parent writes to it, 27 * the readable pipe end becomes child's stdin 28 * .out, .err: returns the readable pipe end; parent reads from 29 * it, the writable pipe end becomes child's stdout/stderr 30 * The caller of start_command() must close the returned FDs 31 * after it has completed reading from/writing to it! 32 * - Specify > 0 to set a channel to a particular FD as follows: 33 * .in: a readable FD, becomes child's stdin 34 * .out: a writable FD, becomes child's stdout/stderr 35 * .err > 0 not supported 36 * The specified FD is closed by start_command(), even in case 37 * of errors! 38 */ 39 int in; 40 int out; 41 int err; 42 const char *dir; 43 const char *const *env; 44 unsigned no_stdin:1; 45 unsigned no_stdout:1; 46 unsigned no_stderr:1; 47 unsigned exec_cmd:1; /* if this is to be external sub-command */ 48 unsigned stdout_to_stderr:1; 49 void (*preexec_cb)(void); 50 /* If set, call function in child rather than doing an exec. */ 51 int (*no_exec_cmd)(struct child_process *process); 52 }; 53 54 int start_command(struct child_process *); 55 int finish_command(struct child_process *); 56 int run_command(struct child_process *); 57 58 #define RUN_COMMAND_NO_STDIN 1 59 #define RUN_EXEC_CMD 2 /*If this is to be external sub-command */ 60 #define RUN_COMMAND_STDOUT_TO_STDERR 4 61 int run_command_v_opt(const char **argv, int opt); 62 63 #endif /* __SUBCMD_RUN_COMMAND_H */ 64