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c460c0ecdc
All child_process structs need to point to an argv. For flexibility, we do not mandate the use of a dynamic argv_array. However, because the child_process does not own the memory, this can make memory management with a separate argv_array difficult. For example, if a function calls start_command but not finish_command, the argv memory must persist. The code needs to arrange to clean up the argv_array separately after finish_command runs. As a result, some of our code in this situation just leaks the memory. To help such cases, this patch adds a built-in argv_array to the child_process, which gets cleaned up automatically (both in finish_command and when start_command fails). Callers may use it if they choose, but can continue to use the raw argv if they wish. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
105 lines
3.2 KiB
C
105 lines
3.2 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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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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};
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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 run_command(struct child_process *);
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extern 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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LAST_ARG_MUST_BE_NULL
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__attribute__((deprecated))
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extern int run_hook_with_custom_index(const char *index_file, const char *name, ...);
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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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* 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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};
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int start_async(struct async *async);
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int finish_async(struct async *async);
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#endif
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