Andrew's git - gitweb.git/blob

   1#ifndef RUN_COMMAND_H
   2#define RUN_COMMAND_H
   3
   4enum {
   5        ERR_RUN_COMMAND_FORK = 10000,
   6        ERR_RUN_COMMAND_EXEC,
   7        ERR_RUN_COMMAND_PIPE,
   8        ERR_RUN_COMMAND_WAITPID,
   9        ERR_RUN_COMMAND_WAITPID_WRONG_PID,
  10        ERR_RUN_COMMAND_WAITPID_SIGNAL,
  11        ERR_RUN_COMMAND_WAITPID_NOEXIT,
  12};
  13#define IS_RUN_COMMAND_ERR(x) ((x) <= -ERR_RUN_COMMAND_FORK)
  14
  15struct child_process {
  16        const char **argv;
  17        pid_t pid;
  18        /*
  19         * Using .in, .out, .err:
  20         * - Specify 0 for no redirections (child inherits stdin, stdout,
  21         *   stderr from parent).
  22         * - Specify -1 to have a pipe allocated as follows:
  23         *     .in: returns the writable pipe end; parent writes to it,
  24         *          the readable pipe end becomes child's stdin
  25         *     .out, .err: returns the readable pipe end; parent reads from
  26         *          it, the writable pipe end becomes child's stdout/stderr
  27         *   The caller of start_command() must close the returned FDs
  28         *   after it has completed reading from/writing to it!
  29         * - Specify > 0 to set a channel to a particular FD as follows:
  30         *     .in: a readable FD, becomes child's stdin
  31         *     .out: a writable FD, becomes child's stdout/stderr
  32         *     .err > 0 not supported
  33         *   The specified FD is closed by start_command(), even in case
  34         *   of errors!
  35         */
  36        int in;
  37        int out;
  38        int err;
  39        const char *dir;
  40        const char *const *env;
  41        unsigned no_stdin:1;
  42        unsigned no_stdout:1;
  43        unsigned no_stderr:1;
  44        unsigned git_cmd:1; /* if this is to be git sub-command */
  45        unsigned stdout_to_stderr:1;
  46        void (*preexec_cb)(void);
  47};
  48
  49int start_command(struct child_process *);
  50int finish_command(struct child_process *);
  51int run_command(struct child_process *);
  52
  53#define RUN_COMMAND_NO_STDIN 1
  54#define RUN_GIT_CMD          2  /*If this is to be git sub-command */
  55#define RUN_COMMAND_STDOUT_TO_STDERR 4
  56int run_command_v_opt(const char **argv, int opt);
  57
  58/*
  59 * env (the environment) is to be formatted like environ: "VAR=VALUE".
  60 * To unset an environment variable use just "VAR".
  61 */
  62int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env);
  63
  64/*
  65 * The purpose of the following functions is to feed a pipe by running
  66 * a function asynchronously and providing output that the caller reads.
  67 *
  68 * It is expected that no synchronization and mutual exclusion between
  69 * the caller and the feed function is necessary so that the function
  70 * can run in a thread without interfering with the caller.
  71 */
  72struct async {
  73        /*
  74         * proc writes to fd and closes it;
  75         * returns 0 on success, non-zero on failure
  76         */
  77        int (*proc)(int fd, void *data);
  78        void *data;
  79        int out;        /* caller reads from here and closes it */
  80#ifndef __MINGW32__
  81        pid_t pid;
  82#else
  83        HANDLE tid;
  84        int fd_for_proc;
  85#endif
  86};
  87
  88int start_async(struct async *async);
  89int finish_async(struct async *async);
  90
  91#endif