89 lines
2.7 KiB
C
89 lines
2.7 KiB
C
#ifndef RUN_COMMAND_H
|
|
#define RUN_COMMAND_H
|
|
|
|
enum {
|
|
ERR_RUN_COMMAND_FORK = 10000,
|
|
ERR_RUN_COMMAND_EXEC,
|
|
ERR_RUN_COMMAND_PIPE,
|
|
ERR_RUN_COMMAND_WAITPID,
|
|
ERR_RUN_COMMAND_WAITPID_WRONG_PID,
|
|
ERR_RUN_COMMAND_WAITPID_SIGNAL,
|
|
ERR_RUN_COMMAND_WAITPID_NOEXIT,
|
|
};
|
|
#define IS_RUN_COMMAND_ERR(x) (-(x) >= ERR_RUN_COMMAND_FORK)
|
|
|
|
struct child_process {
|
|
const char **argv;
|
|
pid_t pid;
|
|
/*
|
|
* Using .in, .out, .err:
|
|
* - Specify 0 for no redirections (child inherits stdin, stdout,
|
|
* stderr from parent).
|
|
* - Specify -1 to have a pipe allocated as follows:
|
|
* .in: returns the writable pipe end; parent writes to it,
|
|
* the readable pipe end becomes child's stdin
|
|
* .out, .err: returns the readable pipe end; parent reads from
|
|
* it, the writable pipe end becomes child's stdout/stderr
|
|
* The caller of start_command() must close the returned FDs
|
|
* after it has completed reading from/writing to it!
|
|
* - Specify > 0 to set a channel to a particular FD as follows:
|
|
* .in: a readable FD, becomes child's stdin
|
|
* .out: a writable FD, becomes child's stdout/stderr
|
|
* .err > 0 not supported
|
|
* The specified FD is closed by start_command(), even in case
|
|
* of errors!
|
|
*/
|
|
int in;
|
|
int out;
|
|
int err;
|
|
const char *dir;
|
|
const char *const *env;
|
|
unsigned no_stdin:1;
|
|
unsigned no_stdout:1;
|
|
unsigned no_stderr:1;
|
|
unsigned perf_cmd:1; /* if this is to be perf sub-command */
|
|
unsigned stdout_to_stderr:1;
|
|
void (*preexec_cb)(void);
|
|
};
|
|
|
|
int start_command(struct child_process *);
|
|
int finish_command(struct child_process *);
|
|
int run_command(struct child_process *);
|
|
|
|
extern int run_hook(const char *index_file, const char *name, ...);
|
|
|
|
#define RUN_COMMAND_NO_STDIN 1
|
|
#define RUN_PERF_CMD 2 /*If this is to be perf sub-command */
|
|
#define RUN_COMMAND_STDOUT_TO_STDERR 4
|
|
int run_command_v_opt(const char **argv, int opt);
|
|
|
|
/*
|
|
* env (the environment) is to be formatted like environ: "VAR=VALUE".
|
|
* To unset an environment variable use just "VAR".
|
|
*/
|
|
int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env);
|
|
|
|
/*
|
|
* The purpose of the following functions is to feed a pipe by running
|
|
* a function asynchronously and providing output that the caller reads.
|
|
*
|
|
* It is expected that no synchronization and mutual exclusion between
|
|
* the caller and the feed function is necessary so that the function
|
|
* can run in a thread without interfering with the caller.
|
|
*/
|
|
struct async {
|
|
/*
|
|
* proc writes to fd and closes it;
|
|
* returns 0 on success, non-zero on failure
|
|
*/
|
|
int (*proc)(int fd, void *data);
|
|
void *data;
|
|
int out; /* caller reads from here and closes it */
|
|
pid_t pid;
|
|
};
|
|
|
|
int start_async(struct async *async);
|
|
int finish_async(struct async *async);
|
|
|
|
#endif
|