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https://github.com/fish-shell/fish-shell
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dc8d31a12a
Reduces lint errors from 37 to 20 (-46%). Line count from 670 to 566 (-15%). Another step in resolving issue #2902.
65 lines
2.9 KiB
C++
65 lines
2.9 KiB
C++
// Functions that we may safely call after fork(), of which there are very few. In particular we
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// cannot allocate memory, since we're insane enough to call fork from a multithreaded process.
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#ifndef FISH_POSTFORK_H
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#define FISH_POSTFORK_H
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#include "config.h"
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#include <unistd.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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#include <stdbool.h>
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class io_chain_t;
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class job_t;
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class process_t;
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/// This function should be called by both the parent process and the child right after fork() has
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/// been called. If job control is 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 terminal. When called in the parent
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/// process, this function may fail, since the child might have already finished and called exit.
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/// The parent process may safely ignore the exit status of this call.
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///
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/// Returns 0 on sucess, -1 on failiure.
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int set_child_group(job_t *j, process_t *p, int print_errors);
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/// Initialize a new child process. This should be called right away after forking in the child
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/// process. If job control is enabled for this job, the process is put in the process group of the
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/// job, all signal handlers are reset, signals are unblocked (this function may only be called
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/// inside the exec function, which blocks all signals), and all IO redirections and other file
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/// descriptor actions are performed.
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///
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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
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///
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/// \return 0 on sucess, -1 on failiure. When this function returns, signals are always unblocked.
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/// On failiure, signal handlers, io redirections and process group of the process is undefined.
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int setup_child_process(job_t *j, process_t *p, const io_chain_t &io_chain);
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/// Call fork(), optionally waiting until we are no longer multithreaded. If the forked child
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/// doesn't do anything that could allocate memory, take a lock, etc. (like call exec), then it's
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/// not necessary to wait for threads to die. If the forked child may do those things, it should
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/// wait for threads to die.
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pid_t execute_fork(bool wait_for_threads_to_die);
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/// Perform output from builtins. Returns true on success.
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bool do_builtin_io(const char *out, size_t outlen, const char *err, size_t errlen);
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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, const char *const *argv,
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const char *const *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
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/// posix_spawnattr_destroy.
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bool fork_actions_make_spawn_properties(posix_spawnattr_t *attr,
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posix_spawn_file_actions_t *actions, job_t *j, process_t *p,
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const io_chain_t &io_chain);
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#endif
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#endif
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