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         int in;
  18         int out;
  19         int err;
  20         const char *dir;
  21         const char *const *env;
  22         unsigned close_in:1;
  23         unsigned close_out:1;
  24         unsigned no_stdin:1;
  25         unsigned no_stdout:1;
  26         unsigned no_stderr:1;
  27         unsigned git_cmd:1; /* if this is to be git sub-command */
  28         unsigned stdout_to_stderr:1;
  29 };
  30
  31 int start_command(struct child_process *);
  32 int finish_command(struct child_process *);
  33 int run_command(struct child_process *);
  34
  35 #define RUN_COMMAND_NO_STDIN 1
  36 #define RUN_GIT_CMD          2  /*If this is to be git sub-command */
  37 #define RUN_COMMAND_STDOUT_TO_STDERR 4
  38 int run_command_v_opt(const char **argv, int opt);
  39 int run_command_v_opt_cd(const char **argv, int opt, const char *dir);
  40
  41 /*
  42  * env (the environment) is to be formatted like environ: "VAR=VALUE".
  43  * To unset an environment variable use just "VAR".
  44  */
  45 int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env);
  46
  47 /*
  48  * The purpose of the following functions is to feed a pipe by running
  49  * a function asynchronously and providing output that the caller reads.
  50  *
  51  * It is expected that no synchronization and mutual exclusion between
  52  * the caller and the feed function is necessary so that the function
  53  * can run in a thread without interfering with the caller.
  54  */
  55 struct async {
  56         /*
  57          * proc writes to fd and closes it;
  58          * returns 0 on success, non-zero on failure
  59          */
  60         int (*proc)(int fd, void *data);
  61         void *data;
  62         int out;        /* caller reads from here and closes it */
  63         pid_t pid;
  64 };
  65
  66 int start_async(struct async *async);
  67 int finish_async(struct async *async);
  68
  69 #endif