run-command.h

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