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