run-command.h

   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
  10 struct 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
  47 #define CHILD_PROCESS_INIT { NULL, ARGV_ARRAY_INIT }
  48 void child_process_init(struct child_process *);
  49
  50 int start_command(struct child_process *);
  51 int finish_command(struct child_process *);
  52 int run_command(struct child_process *);
  53
  54 extern char *find_hook(const char *name);
  55 LAST_ARG_MUST_BE_NULL
  56 extern int run_hook_le(const char *const *env, const char *name, ...);
  57 extern int run_hook_ve(const char *const *env, const char *name, va_list args);
  58
  59 LAST_ARG_MUST_BE_NULL
  60 __attribute__((deprecated))
  61 extern int run_hook_with_custom_index(const char *index_file, const char *name, ...);
  62
  63 #define RUN_COMMAND_NO_STDIN 1
  64 #define RUN_GIT_CMD          2  /*If this is to be git sub-command */
  65 #define RUN_COMMAND_STDOUT_TO_STDERR 4
  66 #define RUN_SILENT_EXEC_FAILURE 8
  67 #define RUN_USING_SHELL 16
  68 #define RUN_CLEAN_ON_EXIT 32
  69 int run_command_v_opt(const char **argv, int opt);
  70
  71 /*
  72  * env (the environment) is to be formatted like environ: "VAR=VALUE".
  73  * To unset an environment variable use just "VAR".
  74  */
  75 int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env);
  76
  77 /*
  78  * The purpose of the following functions is to feed a pipe by running
  79  * a function asynchronously and providing output that the caller reads.
  80  *
  81  * It is expected that no synchronization and mutual exclusion between
  82  * the caller and the feed function is necessary so that the function
  83  * can run in a thread without interfering with the caller.
  84  */
  85 struct async {
  86         /*
  87          * proc reads from in; closes it before return
  88          * proc writes to out; closes it before return
  89          * returns 0 on success, non-zero on failure
  90          */
  91         int (*proc)(int in, int out, void *data);
  92         void *data;
  93         int in;         /* caller writes here and closes it */
  94         int out;        /* caller reads from here and closes it */
  95 #ifdef NO_PTHREADS
  96         pid_t pid;
  97 #else
  98         pthread_t tid;
  99         int proc_in;
 100         int proc_out;
 101 #endif
 102 };
 103
 104 int start_async(struct async *async);
 105 int finish_async(struct async *async);
 106
 107 #endif