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 };
51
52 int start_command(struct child_process *);
53 int finish_command(struct child_process *);
54 int run_command(struct child_process *);
55
56 #define RUN_COMMAND_NO_STDIN 1
57 #define RUN_EXEC_CMD 2 /*If this is to be external sub-command */
58 #define RUN_COMMAND_STDOUT_TO_STDERR 4
59 int run_command_v_opt(const char **argv, int opt);
60
61 #endif /* __SUBCMD_RUN_COMMAND_H */