From 87c07559af5cfcd2752295ef7c425bd3205f426f Mon Sep 17 00:00:00 2001 From: Stephen Gallagher Date: Wed, 14 Dec 2011 14:32:05 -0500 Subject: Move child_common routines to util --- src/util/child_common.h | 109 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 109 insertions(+) create mode 100644 src/util/child_common.h (limited to 'src/util/child_common.h') diff --git a/src/util/child_common.h b/src/util/child_common.h new file mode 100644 index 000000000..1e9f1b6c1 --- /dev/null +++ b/src/util/child_common.h @@ -0,0 +1,109 @@ +/* + SSSD + + Common helper functions to be used in child processes + + Authors: + Sumit Bose + + Copyright (C) 2009 Red Hat + + 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; either version 3 of the License, or + (at your option) any later version. + + 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, see . +*/ + +#ifndef __CHILD_COMMON_H__ +#define __CHILD_COMMON_H__ + +#include +#include +#include +#include + +#include "util/util.h" + +#define IN_BUF_SIZE 512 +#define CHILD_MSG_CHUNK 256 + +struct response { + uint8_t *buf; + size_t size; +}; + +struct io_buffer { + uint8_t *data; + size_t size; +}; + +/* COMMON SIGCHLD HANDLING */ +typedef void (*sss_child_fn_t)(int pid, int wait_status, void *pvt); + +struct sss_sigchild_ctx; +struct sss_child_ctx; + +/* Create a new child context to manage callbacks */ +errno_t sss_sigchld_init(TALLOC_CTX *mem_ctx, + struct tevent_context *ev, + struct sss_sigchild_ctx **child_ctx); + +errno_t sss_child_register(TALLOC_CTX *mem_ctx, + struct sss_sigchild_ctx *sigchld_ctx, + pid_t pid, + sss_child_fn_t cb, + void *pvt, + struct sss_child_ctx **child_ctx); + +void sss_child_handler(struct tevent_context *ev, + struct tevent_signal *se, + int signum, + int count, + void *siginfo, + void *private_data); + +/* Callback to be invoked when a sigchld handler is called. + * The tevent_signal * associated with the handler will be + * freed automatically when this function returns. + */ +typedef void (*sss_child_callback_t)(int child_status, + struct tevent_signal *sige, + void *pvt); + +/* Set up child termination signal handler */ +int child_handler_setup(struct tevent_context *ev, int pid, + sss_child_callback_t cb, void *pvt); + +/* Async communication with the child process via a pipe */ +struct tevent_req *write_pipe_send(TALLOC_CTX *mem_ctx, + struct tevent_context *ev, + uint8_t *buf, size_t len, int fd); +int write_pipe_recv(struct tevent_req *req); + +struct tevent_req *read_pipe_send(TALLOC_CTX *mem_ctx, + struct tevent_context *ev, int fd); +int read_pipe_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx, + uint8_t **buf, ssize_t *len); + +/* The pipes to communicate with the child must be nonblocking */ +void fd_nonblocking(int fd); + +void child_sig_handler(struct tevent_context *ev, + struct tevent_signal *sige, int signum, + int count, void *__siginfo, void *pvt); + +errno_t exec_child(TALLOC_CTX *mem_ctx, + int *pipefd_to_child, int *pipefd_from_child, + const char *binary, int debug_fd); + +void child_cleanup(int readfd, int writefd); + +#endif /* __CHILD_COMMON_H__ */ -- cgit