Merge branch 'master' into iwyu

1 files changed, 75 insertions, 0 deletions

diff --git a/src/exec.h b/src/exec.h
new file mode 100644
index 00000000..41dc3193
--- /dev/null
+++ b/src/exec.h
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+/** \file exec.h
+  Prototypes for functions for executing a program
+*/
+
+#ifndef FISH_EXEC_H
+/**
+   Header guard
+*/
+#define FISH_EXEC_H
+
+#include <stddef.h>
+#include <vector>
+
+#include "common.h"
+
+/**
+   pipe redirection error message
+*/
+#define PIPE_ERROR _(L"An error occurred while setting up pipe")
+
+/**
+  Execute the processes specified by j.
+
+   I've put a fair bit of work into making builtins behave like other
+   programs as far as pipes are concerned. Unlike i.e. bash, builtins
+   can pipe to other builtins with arbitrary amounts of data, and so
+   on. To do this, after a builtin is run in the real process, it
+   forks and a dummy process is created, responsible for writing the
+   output of the builtin. This is surprisingly cheap on my computer,
+   probably because of the marvels of copy on write forking.
+
+   This rule is short circuited in the case where a builtin does not
+   output to a pipe and does in fact not output anything. The speed
+   improvement from this optimization is not noticable on a normal
+   computer/OS in regular use, but the promiscous amounts of forking
+   that resulted was responsible for a huge slowdown when using
+   Valgrind as well as when doing complex command-specific
+   completions.
+
+
+*/
+class job_t;
+class parser_t;
+void exec_job(parser_t &parser, job_t *j);
+
+/**
+  Evaluate the expression cmd in a subshell, add the outputs into the
+  list l. On return, the status flag as returned bu \c
+  proc_gfet_last_status will not be changed.
+
+  \param cmd the command to execute
+  \param outputs The list to insert output into.
+
+  \return the status of the last job to exit, or -1 if en error was encountered.
+*/
+int exec_subshell(const wcstring &cmd, std::vector<wcstring> &outputs, bool preserve_exit_status);
+int exec_subshell(const wcstring &cmd, bool preserve_exit_status);
+
+
+/**
+   Loops over close until the syscall was run without being
+   interrupted.
+*/
+void exec_close(int fd);
+
+/**
+   Call pipe(), and add resulting fds to open_fds, the list of opened
+   file descriptors for pipes. The pipes are marked CLO_EXEC.
+*/
+int exec_pipe(int fd[2]);
+
+/** Gets the interpreter for a given command */
+char *get_interpreter(const char *command, char *interpreter, size_t buff_size);
+
+#endif