1 files changed, 93 insertions, 0 deletions

diff --git a/tools/perf/util/run-command.h b/tools/perf/util/run-command.h
new file mode 100644
index 000000000000..328289f23669
--- /dev/null
+++ b/tools/perf/util/run-command.h
@@ -0,0 +1,93 @@
+#ifndef RUN_COMMAND_H
+#define RUN_COMMAND_H
+
+enum {
+        ERR_RUN_COMMAND_FORK = 10000,
+        ERR_RUN_COMMAND_EXEC,
+        ERR_RUN_COMMAND_PIPE,
+        ERR_RUN_COMMAND_WAITPID,
+        ERR_RUN_COMMAND_WAITPID_WRONG_PID,
+        ERR_RUN_COMMAND_WAITPID_SIGNAL,
+        ERR_RUN_COMMAND_WAITPID_NOEXIT,
+};
+#define IS_RUN_COMMAND_ERR(x) (-(x) >= ERR_RUN_COMMAND_FORK)
+
+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 > 0 not supported
+         *   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 perf_cmd:1; /* if this is to be perf sub-command */
+        unsigned stdout_to_stderr:1;
+        void (*preexec_cb)(void);
+};
+
+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_PERF_CMD         2  /*If this is to be perf sub-command */
+#define RUN_COMMAND_STDOUT_TO_STDERR 4
+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 writes to fd and closes it;
+         * returns 0 on success, non-zero on failure
+         */
+        int (*proc)(int fd, void *data);
+        void *data;
+        int out;        /* caller reads from here and closes it */
+#ifndef __MINGW32__
+        pid_t pid;
+#else
+        HANDLE tid;
+        int fd_for_proc;
+#endif
+};
+
+int start_async(struct async *async);
+int finish_async(struct async *async);
+
+#endif