git/sub-process.h
Jonathan Tan 7e2e1bbb24 Documentation: migrate sub-process docs to header
Move the documentation for the sub-process API from a separate txt file
to its header file.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-07-26 12:56:40 -07:00

73 lines
2.3 KiB
C

#ifndef SUBPROCESS_H
#define SUBPROCESS_H
#include "git-compat-util.h"
#include "hashmap.h"
#include "run-command.h"
/*
* The sub-process API makes it possible to run background sub-processes
* for the entire lifetime of a Git invocation. If Git needs to communicate
* with an external process multiple times, then this can reduces the process
* invocation overhead. Git and the sub-process communicate through stdin and
* stdout.
*
* The sub-processes are kept in a hashmap by command name and looked up
* via the subprocess_find_entry function. If an existing instance can not
* be found then a new process should be created and started. When the
* parent git command terminates, all sub-processes are also terminated.
*
* This API is based on the run-command API.
*/
/* data structures */
/* Members should not be accessed directly. */
struct subprocess_entry {
struct hashmap_entry ent; /* must be the first member! */
const char *cmd;
struct child_process process;
};
/* subprocess functions */
/* Function to test two subprocess hashmap entries for equality. */
extern int cmd2process_cmp(const void *unused_cmp_data,
const struct subprocess_entry *e1,
const struct subprocess_entry *e2,
const void *unused_keydata);
/*
* User-supplied function to initialize the sub-process. This is
* typically used to negotiate the interface version and capabilities.
*/
typedef int(*subprocess_start_fn)(struct subprocess_entry *entry);
/* Start a subprocess and add it to the subprocess hashmap. */
int subprocess_start(struct hashmap *hashmap, struct subprocess_entry *entry, const char *cmd,
subprocess_start_fn startfn);
/* Kill a subprocess and remove it from the subprocess hashmap. */
void subprocess_stop(struct hashmap *hashmap, struct subprocess_entry *entry);
/* Find a subprocess in the subprocess hashmap. */
struct subprocess_entry *subprocess_find_entry(struct hashmap *hashmap, const char *cmd);
/* subprocess helper functions */
/* Get the underlying `struct child_process` from a subprocess. */
static inline struct child_process *subprocess_get_child_process(
struct subprocess_entry *entry)
{
return &entry->process;
}
/*
* Helper function that will read packets looking for "status=<foo>"
* key/value pairs and return the value from the last "status" packet
*/
int subprocess_read_status(int fd, struct strbuf *status);
#endif