mirror of
https://github.com/git/git
synced 2024-10-02 14:45:21 +00:00
afe19ff7b5
When we spawn a helper process, it should generally be done
and finish_command called before we exit. However, if we
exit abnormally due to an early return or a signal, the
helper may continue to run in our absence.
In the best case, this may simply be wasted CPU cycles or a
few stray messages on a terminal. But it could also mean a
process that the user thought was aborted continues to run
to completion (e.g., a push's pack-objects helper will
complete the push, even though you killed the push process).
This patch provides infrastructure for run-command to keep
track of PIDs to be killed, and clean them on signal
reception or input, just as we do with tempfiles. PIDs can
be added in two ways:
1. If NO_PTHREADS is defined, async helper processes are
automatically marked. By definition this code must be
ready to die when the parent dies, since it may be
implemented as a thread of the parent process.
2. If the run-command caller specifies the "clean_on_exit"
option. This is not the default, as there are cases
where it is OK for the child to outlive us (e.g., when
spawning a pager).
PIDs are cleared from the kill-list automatically during
wait_or_whine, which is called from finish_command and
finish_async.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Clemens Buchacher <drizzd@aon.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
95 lines
2.8 KiB
C
95 lines
2.8 KiB
C
#ifndef RUN_COMMAND_H
|
|
#define RUN_COMMAND_H
|
|
|
|
#ifndef NO_PTHREADS
|
|
#include <pthread.h>
|
|
#endif
|
|
|
|
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: a writable FD, becomes child's stderr
|
|
* 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 git_cmd:1; /* if this is to be git sub-command */
|
|
unsigned silent_exec_failure:1;
|
|
unsigned stdout_to_stderr:1;
|
|
unsigned use_shell:1;
|
|
unsigned clean_on_exit: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_GIT_CMD 2 /*If this is to be git sub-command */
|
|
#define RUN_COMMAND_STDOUT_TO_STDERR 4
|
|
#define RUN_SILENT_EXEC_FAILURE 8
|
|
#define RUN_USING_SHELL 16
|
|
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 reads from in; closes it before return
|
|
* proc writes to out; closes it before return
|
|
* returns 0 on success, non-zero on failure
|
|
*/
|
|
int (*proc)(int in, int out, void *data);
|
|
void *data;
|
|
int in; /* caller writes here and closes it */
|
|
int out; /* caller reads from here and closes it */
|
|
#ifdef NO_PTHREADS
|
|
pid_t pid;
|
|
#else
|
|
pthread_t tid;
|
|
int proc_in;
|
|
int proc_out;
|
|
#endif
|
|
};
|
|
|
|
int start_async(struct async *async);
|
|
int finish_async(struct async *async);
|
|
|
|
#endif
|