1 files changed, 109 insertions, 0 deletions
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   <sbose@redhat.com>
+
+    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 <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __CHILD_COMMON_H__
+#define __CHILD_COMMON_H__
+
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <tevent.h>
+
+#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__ */