mirror of
https://github.com/fish-shell/fish-shell
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82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
/** \file exec.h
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Prototypes for functions for executing a program
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*/
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#ifndef FISH_EXEC_H
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/**
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Header guard
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*/
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#define FISH_EXEC_H
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#include <wchar.h>
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#include <vector>
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#include "proc.h"
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#include "util.h"
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#include "common.h"
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/**
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pipe redirection error message
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*/
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#define PIPE_ERROR _(L"An error occurred while setting up pipe")
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/**
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Execute the processes specified by j.
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I've put a fair bit of work into making builtins behave like other
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programs as far as pipes are concerned. Unlike i.e. bash, builtins
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can pipe to other builtins with arbitrary amounts of data, and so
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on. To do this, after a builtin is run in the real process, it
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forks and a dummy process is created, responsible for writing the
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output of the builtin. This is surprisingly cheap on my computer,
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probably because of the marvels of copy on write forking.
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This rule is short circuited in the case where a builtin does not
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output to a pipe and does in fact not output anything. The speed
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improvement from this optimization is not noticable on a normal
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computer/OS in regular use, but the promiscous amounts of forking
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that resulted was responsible for a huge slowdown when using
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Valgrind as well as when doing complex command-specific
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completions.
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*/
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class parser_t;
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void exec(parser_t &parser, job_t *j);
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/**
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Evaluate the expression cmd in a subshell, add the outputs into the
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list l. On return, the status flag as returned bu \c
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proc_gfet_last_status will not be changed.
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\param cmd the command to execute
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\param outputs The list to insert output into.
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\return the status of the last job to exit, or -1 if en error was encountered.
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*/
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__warn_unused int exec_subshell(const wcstring &cmd, std::vector<wcstring> &outputs);
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__warn_unused int exec_subshell(const wcstring &cmd);
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/**
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Loops over close until the syscall was run without being
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interrupted. Then removes the fd from the open_fds list.
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*/
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void exec_close(int fd);
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/**
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Call pipe(), and add resulting fds to open_fds, the list of opend
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file descriptors for pipes.
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*/
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int exec_pipe(int fd[2]);
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/* Close all fds in open_fds. This is called from postfork.cpp */
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void close_unused_internal_pipes(const io_chain_t &io);
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/* Gets all unused internal pipes into fds */
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void get_unused_internal_pipes(std::vector<int> &fds, const io_chain_t &io);
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/** Gets the interpreter for a given command */
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char *get_interpreter(const char *command, char *interpreter, size_t buff_size);
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#endif
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