1 files changed, 85 insertions, 12 deletions
diff --git a/run-command.h b/run-command.h
index 70b477a748..56491b9f23 100644
--- a/run-command.h
+++ b/run-command.h
@@ -1,20 +1,93 @@
 #ifndef RUN_COMMAND_H
 #define RUN_COMMAND_H
 
-#define MAX_RUN_COMMAND_ARGS 256
-enum {
-	ERR_RUN_COMMAND_FORK = 10000,
-	ERR_RUN_COMMAND_EXEC,
-	ERR_RUN_COMMAND_WAITPID,
-	ERR_RUN_COMMAND_WAITPID_WRONG_PID,
-	ERR_RUN_COMMAND_WAITPID_SIGNAL,
-	ERR_RUN_COMMAND_WAITPID_NOEXIT,
+#ifndef NO_PTHREADS
+#include <pthread.h>
+#endif
+
+struct child_process {
+	const char **argv;
+	pid_t pid;
+	/*
+	 * Using .in, .out, .err:
+	 * - Specify 0 for no redirections (child inherits stdin, stdout,
+	 *   stderr from parent).
+	 * - Specify -1 to have a pipe allocated as follows:
+	 *     .in: returns the writable pipe end; parent writes to it,
+	 *          the readable pipe end becomes child's stdin
+	 *     .out, .err: returns the readable pipe end; parent reads from
+	 *          it, the writable pipe end becomes child's stdout/stderr
+	 *   The caller of start_command() must close the returned FDs
+	 *   after it has completed reading from/writing to it!
+	 * - Specify > 0 to set a channel to a particular FD as follows:
+	 *     .in: a readable FD, becomes child's stdin
+	 *     .out: a writable FD, becomes child's stdout/stderr
+	 *     .err: a writable FD, becomes child's stderr
+	 *   The specified FD is closed by start_command(), even in case
+	 *   of errors!
+	 */
+	int in;
+	int out;
+	int err;
+	const char *dir;
+	const char *const *env;
+	unsigned no_stdin:1;
+	unsigned no_stdout:1;
+	unsigned no_stderr:1;
+	unsigned git_cmd:1; /* if this is to be git sub-command */
+	unsigned silent_exec_failure:1;
+	unsigned stdout_to_stderr:1;
+	unsigned use_shell:1;
+	void (*preexec_cb)(void);
 };
 
-#define RUN_COMMAND_NO_STDIO 1
+int start_command(struct child_process *);
+int finish_command(struct child_process *);
+int run_command(struct child_process *);
+
+extern int run_hook(const char *index_file, const char *name, ...);
+
+#define RUN_COMMAND_NO_STDIN 1
 #define RUN_GIT_CMD	     2	/*If this is to be git sub-command */
-int run_command_v_opt(int argc, const char **argv, int opt);
-int run_command_v(int argc, const char **argv);
-int run_command(const char *cmd, ...);
+#define RUN_COMMAND_STDOUT_TO_STDERR 4
+#define RUN_SILENT_EXEC_FAILURE 8
+#define RUN_USING_SHELL 16
+int run_command_v_opt(const char **argv, int opt);
+
+/*
+ * env (the environment) is to be formatted like environ: "VAR=VALUE".
+ * To unset an environment variable use just "VAR".
+ */
+int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env);
+
+/*
+ * The purpose of the following functions is to feed a pipe by running
+ * a function asynchronously and providing output that the caller reads.
+ *
+ * It is expected that no synchronization and mutual exclusion between
+ * the caller and the feed function is necessary so that the function
+ * can run in a thread without interfering with the caller.
+ */
+struct async {
+	/*
+	 * proc reads from in; closes it before return
+	 * proc writes to out; closes it before return
+	 * returns 0 on success, non-zero on failure
+	 */
+	int (*proc)(int in, int out, void *data);
+	void *data;
+	int in;		/* caller writes here and closes it */
+	int out;	/* caller reads from here and closes it */
+#ifdef NO_PTHREADS
+	pid_t pid;
+#else
+	pthread_t tid;
+	int proc_in;
+	int proc_out;
+#endif
+};
+
+int start_async(struct async *async);
+int finish_async(struct async *async);
 
 #endif