mirror of
https://github.com/fish-shell/fish-shell.git
synced 2024-11-25 09:39:52 +08:00
80 lines
2.9 KiB
C++
80 lines
2.9 KiB
C++
/** \file postfork.h
|
|
|
|
Functions that we may safely call after fork(), of which there are very few. In particular we cannot allocate memory, since we're insane enough to call fork from a multithreaded process.
|
|
*/
|
|
|
|
#ifndef FISH_POSTFORK_H
|
|
#define FISH_POSTFORK_H
|
|
|
|
#include <wchar.h>
|
|
#include <signal.h>
|
|
#include <unistd.h>
|
|
#include <sys/time.h>
|
|
#include <list>
|
|
|
|
#include "config.h"
|
|
#include "common.h"
|
|
#include "util.h"
|
|
#include "proc.h"
|
|
#include "wutil.h"
|
|
#include "io.h"
|
|
|
|
#if HAVE_SPAWN_H
|
|
#include <spawn.h>
|
|
#endif
|
|
|
|
#ifndef FISH_USE_POSIX_SPAWN
|
|
#define FISH_USE_POSIX_SPAWN HAVE_SPAWN_H
|
|
#endif
|
|
|
|
|
|
/**
|
|
This function should be called by both the parent process and the
|
|
child right after fork() has been called. If job control is
|
|
enabled, the child is put in the jobs group, and if the child is
|
|
also in the foreground, it is also given control of the
|
|
terminal. When called in the parent process, this function may
|
|
fail, since the child might have already finished and called
|
|
exit. The parent process may safely ignore the exit status of this
|
|
call.
|
|
|
|
Returns 0 on sucess, -1 on failiure.
|
|
*/
|
|
int set_child_group(job_t *j, process_t *p, int print_errors);
|
|
|
|
/**
|
|
Initialize a new child process. This should be called right away
|
|
after forking in the child process. If job control is enabled for
|
|
this job, the process is put in the process group of the job, all
|
|
signal handlers are reset, signals are unblocked (this function may
|
|
only be called inside the exec function, which blocks all signals),
|
|
and all IO redirections and other file descriptor actions are
|
|
performed.
|
|
|
|
\param j the job to set up the IO for
|
|
\param p the child process to set up
|
|
\param io_chain the IO chain to use (ignores the job's iochain)
|
|
|
|
\return 0 on sucess, -1 on failiure. When this function returns,
|
|
signals are always unblocked. On failiure, signal handlers, io
|
|
redirections and process group of the process is undefined.
|
|
*/
|
|
int setup_child_process(job_t *j, process_t *p);
|
|
|
|
/* Call fork(), optionally waiting until we are no longer multithreaded. If the forked child doesn't do anything that could allocate memory, take a lock, etc. (like call exec), then it's not necessary to wait for threads to die. If the forked child may do those things, it should wait for threads to die.
|
|
*/
|
|
pid_t execute_fork(bool wait_for_threads_to_die);
|
|
|
|
/* Perform output from builtins. Returns true on success. */
|
|
bool do_builtin_io(const char *out, size_t outlen, const char *err, size_t errlen);
|
|
|
|
/** Report an error from failing to exec or posix_spawn a command */
|
|
void safe_report_exec_error(int err, const char *actual_cmd, const char * const *argv, const char * const *envv);
|
|
|
|
#if FISH_USE_POSIX_SPAWN
|
|
/* Initializes and fills in a posix_spawnattr_t; on success, the caller should destroy it via posix_spawnattr_destroy */
|
|
bool fork_actions_make_spawn_properties(posix_spawnattr_t *attr, posix_spawn_file_actions_t *actions, job_t *j, process_t *p);
|
|
#endif
|
|
|
|
#endif
|