From e52a8c61a640ab4fce0b4caaa796ae3e1c4ff8a3 Mon Sep 17 00:00:00 2001 From: Jeremy Kerr Date: Mon, 12 Aug 2013 15:57:41 +0800 Subject: lib/process: Add process helpers We've grown-out of pb_run_cmd a little, as we have a number of different process types: boot(): - kexec: short-running process, run synchronously - boot hooks: short-running, run sync, need exit code & stdout network init: - interface configuration: short running, run sync - udhcp processes are long running, we may want completion, but doesn't block other actions downloads: - potentially long-running, block parse progress config nvram: - read: short running, can block, need stdout - write: short running, can block We'd like to introduce proper asynchronous processes, to allow config & boot-option downloads without blocking the discover server. This change introduces a new type for processes, 'struct process'. These structures are created with process_create, and run with process_run_sync or process_run_async. The latter reports completion through a callback member of struct process. Signed-off-by: Jeremy Kerr --- lib/process/process.h | 76 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) create mode 100644 lib/process/process.h (limited to 'lib/process/process.h') diff --git a/lib/process/process.h b/lib/process/process.h new file mode 100644 index 0000000..9e2a2d1 --- /dev/null +++ b/lib/process/process.h @@ -0,0 +1,76 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#ifndef PROCESS_H +#define PROCESS_H + +#include +#include + +#include +#include + +struct process; +struct procset; + +typedef void (*process_exit_cb)(struct process *); + +struct process { + /* caller-provided configuration */ + const char *path; + const char **argv; + bool keep_stdout; + process_exit_cb exit_cb; + void *data; + + /* runtime data */ + pid_t pid; + int stdout_len; + char *stdout_buf; + + /* post-execution information */ + int exit_status; +}; + +/* Process management system init. process_init must be called before + * process_create. The pointer returned can be talloc_free()-ed, or can be + * automatically freed through destruction of the ctx talloc tree. + */ +struct procset *process_init(void *ctx, struct waitset *set); + +struct process *process_create(void *ctx); + +/* process_release: release our reference to the process, but potentially + * leave it running. When the process exits, associated resources will + * be deallocated. + */ +void process_release(struct process *process); + +/* Synchronous interface. These functions will all block while waiting for + * the process to exit. + */ +int process_run_sync(struct process *process); +int process_run_simple_argv(void *ctx, const char *argv[]); +int process_run_simple(void *ctx, const char *name, ...) + __attribute__((sentinel(0))); + +/* Asynchronous interface. When a process is run with process_run_async, the + * function returns without wait()ing for the child process to exit. If the + * process' exit_cb member is set, that callback will be invoked when the + * process exits. + */ +int process_run_async(struct process *process); + +void process_stop_async(struct process *process); +#endif /* PROCESS_H */ -- cgit v1.2.1