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![Brandon Williams](/assets/img/avatar_default.png)
Move the logic for 'is_executable()' from help.c to run_command.c and expose it so that callers from outside help.c can access the function. This is to enable run-command to be able to query if a file is executable in a future patch. Signed-off-by: Brandon Williams <bmwill@google.com> Reviewed-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
226 lines
7.6 KiB
C
226 lines
7.6 KiB
C
#ifndef RUN_COMMAND_H
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#define RUN_COMMAND_H
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#ifndef NO_PTHREADS
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#include <pthread.h>
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#endif
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#include "argv-array.h"
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struct child_process {
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const char **argv;
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struct argv_array args;
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struct argv_array env_array;
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pid_t pid;
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/*
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* Using .in, .out, .err:
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* - Specify 0 for no redirections (child inherits stdin, stdout,
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* stderr from parent).
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* - Specify -1 to have a pipe allocated as follows:
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* .in: returns the writable pipe end; parent writes to it,
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* the readable pipe end becomes child's stdin
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* .out, .err: returns the readable pipe end; parent reads from
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* it, the writable pipe end becomes child's stdout/stderr
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* The caller of start_command() must close the returned FDs
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* after it has completed reading from/writing to it!
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* - Specify > 0 to set a channel to a particular FD as follows:
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* .in: a readable FD, becomes child's stdin
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* .out: a writable FD, becomes child's stdout/stderr
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* .err: a writable FD, becomes child's stderr
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* The specified FD is closed by start_command(), even in case
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* of errors!
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*/
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int in;
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int out;
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int err;
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const char *dir;
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const char *const *env;
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unsigned no_stdin:1;
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unsigned no_stdout:1;
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unsigned no_stderr:1;
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unsigned git_cmd:1; /* if this is to be git sub-command */
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unsigned silent_exec_failure:1;
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unsigned stdout_to_stderr:1;
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unsigned use_shell:1;
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unsigned clean_on_exit:1;
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unsigned wait_after_clean:1;
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void (*clean_on_exit_handler)(struct child_process *process);
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void *clean_on_exit_handler_cbdata;
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};
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#define CHILD_PROCESS_INIT { NULL, ARGV_ARRAY_INIT, ARGV_ARRAY_INIT }
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void child_process_init(struct child_process *);
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void child_process_clear(struct child_process *);
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extern int is_executable(const char *name);
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int start_command(struct child_process *);
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int finish_command(struct child_process *);
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int finish_command_in_signal(struct child_process *);
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int run_command(struct child_process *);
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/*
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* Returns the path to the hook file, or NULL if the hook is missing
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* or disabled. Note that this points to static storage that will be
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* overwritten by further calls to find_hook and run_hook_*.
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*/
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extern const char *find_hook(const char *name);
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LAST_ARG_MUST_BE_NULL
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extern int run_hook_le(const char *const *env, const char *name, ...);
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extern int run_hook_ve(const char *const *env, const char *name, va_list args);
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#define RUN_COMMAND_NO_STDIN 1
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#define RUN_GIT_CMD 2 /*If this is to be git sub-command */
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#define RUN_COMMAND_STDOUT_TO_STDERR 4
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#define RUN_SILENT_EXEC_FAILURE 8
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#define RUN_USING_SHELL 16
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#define RUN_CLEAN_ON_EXIT 32
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int run_command_v_opt(const char **argv, int opt);
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/*
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* env (the environment) is to be formatted like environ: "VAR=VALUE".
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* To unset an environment variable use just "VAR".
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*/
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int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env);
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/**
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* Execute the given command, sending "in" to its stdin, and capturing its
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* stdout and stderr in the "out" and "err" strbufs. Any of the three may
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* be NULL to skip processing.
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*
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* Returns -1 if starting the command fails or reading fails, and otherwise
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* returns the exit code of the command. Any output collected in the
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* buffers is kept even if the command returns a non-zero exit. The hint fields
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* gives starting sizes for the strbuf allocations.
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*
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* The fields of "cmd" should be set up as they would for a normal run_command
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* invocation. But note that there is no need to set the in, out, or err
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* fields; pipe_command handles that automatically.
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*/
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int pipe_command(struct child_process *cmd,
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const char *in, size_t in_len,
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struct strbuf *out, size_t out_hint,
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struct strbuf *err, size_t err_hint);
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/**
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* Convenience wrapper around pipe_command for the common case
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* of capturing only stdout.
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*/
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static inline int capture_command(struct child_process *cmd,
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struct strbuf *out,
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size_t hint)
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{
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return pipe_command(cmd, NULL, 0, out, hint, NULL, 0);
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}
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/*
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* The purpose of the following functions is to feed a pipe by running
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* a function asynchronously and providing output that the caller reads.
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*
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* It is expected that no synchronization and mutual exclusion between
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* the caller and the feed function is necessary so that the function
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* can run in a thread without interfering with the caller.
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*/
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struct async {
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/*
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* proc reads from in; closes it before return
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* proc writes to out; closes it before return
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* returns 0 on success, non-zero on failure
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*/
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int (*proc)(int in, int out, void *data);
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void *data;
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int in; /* caller writes here and closes it */
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int out; /* caller reads from here and closes it */
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#ifdef NO_PTHREADS
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pid_t pid;
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#else
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pthread_t tid;
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int proc_in;
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int proc_out;
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#endif
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int isolate_sigpipe;
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};
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int start_async(struct async *async);
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int finish_async(struct async *async);
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int in_async(void);
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void check_pipe(int err);
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/**
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* This callback should initialize the child process and preload the
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* error channel if desired. The preloading of is useful if you want to
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* have a message printed directly before the output of the child process.
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* pp_cb is the callback cookie as passed to run_processes_parallel.
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* You can store a child process specific callback cookie in pp_task_cb.
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*
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* Even after returning 0 to indicate that there are no more processes,
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* this function will be called again until there are no more running
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* child processes.
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*
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* Return 1 if the next child is ready to run.
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* Return 0 if there are currently no more tasks to be processed.
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* To send a signal to other child processes for abortion,
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* return the negative signal number.
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*/
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typedef int (*get_next_task_fn)(struct child_process *cp,
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struct strbuf *out,
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void *pp_cb,
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void **pp_task_cb);
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/**
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* This callback is called whenever there are problems starting
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* a new process.
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*
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* You must not write to stdout or stderr in this function. Add your
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* message to the strbuf out instead, which will be printed without
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* messing up the output of the other parallel processes.
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*
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* pp_cb is the callback cookie as passed into run_processes_parallel,
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* pp_task_cb is the callback cookie as passed into get_next_task_fn.
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*
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* Return 0 to continue the parallel processing. To abort return non zero.
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* To send a signal to other child processes for abortion, return
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* the negative signal number.
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*/
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typedef int (*start_failure_fn)(struct strbuf *out,
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void *pp_cb,
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void *pp_task_cb);
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/**
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* This callback is called on every child process that finished processing.
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*
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* You must not write to stdout or stderr in this function. Add your
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* message to the strbuf out instead, which will be printed without
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* messing up the output of the other parallel processes.
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*
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* pp_cb is the callback cookie as passed into run_processes_parallel,
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* pp_task_cb is the callback cookie as passed into get_next_task_fn.
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*
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* Return 0 to continue the parallel processing. To abort return non zero.
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* To send a signal to other child processes for abortion, return
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* the negative signal number.
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*/
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typedef int (*task_finished_fn)(int result,
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struct strbuf *out,
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void *pp_cb,
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void *pp_task_cb);
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/**
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* Runs up to n processes at the same time. Whenever a process can be
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* started, the callback get_next_task_fn is called to obtain the data
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* required to start another child process.
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*
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* The children started via this function run in parallel. Their output
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* (both stdout and stderr) is routed to stderr in a manner that output
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* from different tasks does not interleave.
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*
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* start_failure_fn and task_finished_fn can be NULL to omit any
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* special handling.
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*/
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int run_processes_parallel(int n,
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get_next_task_fn,
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start_failure_fn,
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task_finished_fn,
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void *pp_cb);
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#endif
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