Andrew's git - gitweb.git/blob

   1#ifndef RUN_COMMAND_H
   2#define RUN_COMMAND_H
   3
   4#ifndef NO_PTHREADS
   5#include <pthread.h>
   6#endif
   7
   8#include "argv-array.h"
   9
  10struct child_process {
  11        const char **argv;
  12        struct argv_array args;
  13        pid_t pid;
  14        /*
  15         * Using .in, .out, .err:
  16         * - Specify 0 for no redirections (child inherits stdin, stdout,
  17         *   stderr from parent).
  18         * - Specify -1 to have a pipe allocated as follows:
  19         *     .in: returns the writable pipe end; parent writes to it,
  20         *          the readable pipe end becomes child's stdin
  21         *     .out, .err: returns the readable pipe end; parent reads from
  22         *          it, the writable pipe end becomes child's stdout/stderr
  23         *   The caller of start_command() must close the returned FDs
  24         *   after it has completed reading from/writing to it!
  25         * - Specify > 0 to set a channel to a particular FD as follows:
  26         *     .in: a readable FD, becomes child's stdin
  27         *     .out: a writable FD, becomes child's stdout/stderr
  28         *     .err: a writable FD, becomes child's stderr
  29         *   The specified FD is closed by start_command(), even in case
  30         *   of errors!
  31         */
  32        int in;
  33        int out;
  34        int err;
  35        const char *dir;
  36        const char *const *env;
  37        unsigned no_stdin:1;
  38        unsigned no_stdout:1;
  39        unsigned no_stderr:1;
  40        unsigned git_cmd:1; /* if this is to be git sub-command */
  41        unsigned silent_exec_failure:1;
  42        unsigned stdout_to_stderr:1;
  43        unsigned use_shell:1;
  44        unsigned clean_on_exit:1;
  45};
  46
  47int start_command(struct child_process *);
  48int finish_command(struct child_process *);
  49int run_command(struct child_process *);
  50
  51extern char *find_hook(const char *name);
  52LAST_ARG_MUST_BE_NULL
  53extern int run_hook_le(const char *const *env, const char *name, ...);
  54extern int run_hook_ve(const char *const *env, const char *name, va_list args);
  55
  56#define RUN_COMMAND_NO_STDIN 1
  57#define RUN_GIT_CMD          2  /*If this is to be git sub-command */
  58#define RUN_COMMAND_STDOUT_TO_STDERR 4
  59#define RUN_SILENT_EXEC_FAILURE 8
  60#define RUN_USING_SHELL 16
  61#define RUN_CLEAN_ON_EXIT 32
  62int run_command_v_opt(const char **argv, int opt);
  63
  64/*
  65 * env (the environment) is to be formatted like environ: "VAR=VALUE".
  66 * To unset an environment variable use just "VAR".
  67 */
  68int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env);
  69
  70/*
  71 * The purpose of the following functions is to feed a pipe by running
  72 * a function asynchronously and providing output that the caller reads.
  73 *
  74 * It is expected that no synchronization and mutual exclusion between
  75 * the caller and the feed function is necessary so that the function
  76 * can run in a thread without interfering with the caller.
  77 */
  78struct async {
  79        /*
  80         * proc reads from in; closes it before return
  81         * proc writes to out; closes it before return
  82         * returns 0 on success, non-zero on failure
  83         */
  84        int (*proc)(int in, int out, void *data);
  85        void *data;
  86        int in;         /* caller writes here and closes it */
  87        int out;        /* caller reads from here and closes it */
  88#ifdef NO_PTHREADS
  89        pid_t pid;
  90#else
  91        pthread_t tid;
  92        int proc_in;
  93        int proc_out;
  94#endif
  95};
  96
  97int start_async(struct async *async);
  98int finish_async(struct async *async);
  99
 100#endif