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        struct argv_array env_array;
  14        pid_t pid;
  15        /*
  16         * Using .in, .out, .err:
  17         * - Specify 0 for no redirections (child inherits stdin, stdout,
  18         *   stderr from parent).
  19         * - Specify -1 to have a pipe allocated as follows:
  20         *     .in: returns the writable pipe end; parent writes to it,
  21         *          the readable pipe end becomes child's stdin
  22         *     .out, .err: returns the readable pipe end; parent reads from
  23         *          it, the writable pipe end becomes child's stdout/stderr
  24         *   The caller of start_command() must close the returned FDs
  25         *   after it has completed reading from/writing to it!
  26         * - Specify > 0 to set a channel to a particular FD as follows:
  27         *     .in: a readable FD, becomes child's stdin
  28         *     .out: a writable FD, becomes child's stdout/stderr
  29         *     .err: a writable FD, becomes child's stderr
  30         *   The specified FD is closed by start_command(), even in case
  31         *   of errors!
  32         */
  33        int in;
  34        int out;
  35        int err;
  36        const char *dir;
  37        const char *const *env;
  38        unsigned no_stdin:1;
  39        unsigned no_stdout:1;
  40        unsigned no_stderr:1;
  41        unsigned git_cmd:1; /* if this is to be git sub-command */
  42        unsigned silent_exec_failure:1;
  43        unsigned stdout_to_stderr:1;
  44        unsigned use_shell:1;
  45        unsigned clean_on_exit:1;
  46};
  47
  48#define CHILD_PROCESS_INIT { NULL, ARGV_ARRAY_INIT, ARGV_ARRAY_INIT }
  49void child_process_init(struct child_process *);
  50
  51int start_command(struct child_process *);
  52int finish_command(struct child_process *);
  53int run_command(struct child_process *);
  54
  55/*
  56 * Returns the path to the hook file, or NULL if the hook is missing
  57 * or disabled. Note that this points to static storage that will be
  58 * overwritten by further calls to find_hook and run_hook_*.
  59 */
  60extern const char *find_hook(const char *name);
  61LAST_ARG_MUST_BE_NULL
  62extern int run_hook_le(const char *const *env, const char *name, ...);
  63extern int run_hook_ve(const char *const *env, const char *name, va_list args);
  64
  65#define RUN_COMMAND_NO_STDIN 1
  66#define RUN_GIT_CMD          2  /*If this is to be git sub-command */
  67#define RUN_COMMAND_STDOUT_TO_STDERR 4
  68#define RUN_SILENT_EXEC_FAILURE 8
  69#define RUN_USING_SHELL 16
  70#define RUN_CLEAN_ON_EXIT 32
  71int run_command_v_opt(const char **argv, int opt);
  72
  73/*
  74 * env (the environment) is to be formatted like environ: "VAR=VALUE".
  75 * To unset an environment variable use just "VAR".
  76 */
  77int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env);
  78
  79/**
  80 * Execute the given command, capturing its stdout in the given strbuf.
  81 * Returns -1 if starting the command fails or reading fails, and otherwise
  82 * returns the exit code of the command. The output collected in the
  83 * buffer is kept even if the command returns a non-zero exit. The hint field
  84 * gives a starting size for the strbuf allocation.
  85 *
  86 * The fields of "cmd" should be set up as they would for a normal run_command
  87 * invocation. But note that there is no need to set cmd->out; the function
  88 * sets it up for the caller.
  89 */
  90int capture_command(struct child_process *cmd, struct strbuf *buf, size_t hint);
  91
  92/*
  93 * The purpose of the following functions is to feed a pipe by running
  94 * a function asynchronously and providing output that the caller reads.
  95 *
  96 * It is expected that no synchronization and mutual exclusion between
  97 * the caller and the feed function is necessary so that the function
  98 * can run in a thread without interfering with the caller.
  99 */
 100struct async {
 101        /*
 102         * proc reads from in; closes it before return
 103         * proc writes to out; closes it before return
 104         * returns 0 on success, non-zero on failure
 105         */
 106        int (*proc)(int in, int out, void *data);
 107        void *data;
 108        int in;         /* caller writes here and closes it */
 109        int out;        /* caller reads from here and closes it */
 110#ifdef NO_PTHREADS
 111        pid_t pid;
 112#else
 113        pthread_t tid;
 114        int proc_in;
 115        int proc_out;
 116#endif
 117};
 118
 119int start_async(struct async *async);
 120int finish_async(struct async *async);
 121
 122#endif