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77 lines
2.7 KiB
C++
77 lines
2.7 KiB
C++
/** \file postfork.h
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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.
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*/
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#ifndef FISH_POSTFORK_H
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#define FISH_POSTFORK_H
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#include <wchar.h>
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#include <signal.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include <list>
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#include "config.h"
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#include "common.h"
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#include "util.h"
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#include "proc.h"
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#include "wutil.h"
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#include "io.h"
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#if HAVE_SPAWN_H
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#include <spawn.h>
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#endif
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#ifndef FISH_USE_POSIX_SPAWN
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#define FISH_USE_POSIX_SPAWN HAVE_SPAWN_H
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#endif
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/**
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This function should be called by both the parent process and the
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child right after fork() has been called. If job control is
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enabled, the child is put in the jobs group, and if the child is
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also in the foreground, it is also given control of the
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terminal. When called in the parent process, this function may
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fail, since the child might have already finished and called
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exit. The parent process may safely ignore the exit status of this
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call.
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Returns 0 on sucess, -1 on failiure.
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*/
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int set_child_group(job_t *j, process_t *p, int print_errors);
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/**
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Initialize a new child process. This should be called right away
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after forking in the child process. If job control is enabled for
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this job, the process is put in the process group of the job, all
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signal handlers are reset, signals are unblocked (this function may
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only be called inside the exec function, which blocks all signals),
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and all IO redirections and other file descriptor actions are
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performed.
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\param j the job to set up the IO for
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\param p the child process to set up
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\param io_chain the IO chain to use (ignores the job's iochain)
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\return 0 on sucess, -1 on failiure. When this function returns,
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signals are always unblocked. On failiure, signal handlers, io
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redirections and process group of the process is undefined.
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*/
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int setup_child_process(job_t *j, process_t *p);
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/* 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.
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*/
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pid_t execute_fork(bool wait_for_threads_to_die);
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/** Report an error from failing to exec or posix_spawn a command */
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void safe_report_exec_error(int err, const char *actual_cmd, char **argv, char **envv);
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#if FISH_USE_POSIX_SPAWN
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/* Initializes and fills in a posix_spawnattr_t; on success, the caller should destroy it via posix_spawnattr_destroy */
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bool fork_actions_make_spawn_properties(posix_spawnattr_t *attr, posix_spawn_file_actions_t *actions, job_t *j, process_t *p);
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#endif
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#endif
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