1 files changed, 100 insertions, 0 deletions
diff --git a/ctdb/common/run_proc.h b/ctdb/common/run_proc.h
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+++ b/ctdb/common/run_proc.h
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+/*
+   Run a child process and collect the output
+
+   Copyright (C) Amitay Isaacs  2016
+
+   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 __CTDB_RUN_PROC_H__
+#define __CTDB_RUN_PROC_H__
+
+#include <talloc.h>
+#include <tevent.h>
+
+/**
+ * @file run_proc.h
+ *
+ * @brief Run a process and capture the output
+ *
+ * This abstraction allows one to execute scripts with argumunts.
+ */
+
+/**
+ * @brief The run process context
+ */
+struct run_proc_context;
+
+/**
+ * @brief The exit status structure
+ *
+ * If the process is terminated due to a signal, sig is set.
+ * If the process is terminated due to an error, err is set.
+ * If the process terminates normally, status is set.
+ */
+struct run_proc_result {
+	int sig;
+	int err;
+	int status;
+};
+
+/**
+ * @brief Initialize the context for running processes
+ *
+ * @param[in] mem_ctx Talloc memory context
+ * @param[in] ev Tevent context
+ * @param[out] result New run_proc context
+ * @return 0 on success, errno on error
+ */
+int run_proc_init(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
+		  struct run_proc_context **result);
+
+/**
+ * @brief Async computation start to run an executable
+ *
+ * @param[in] mem_ctx Talloc memory context
+ * @param[in] ev Tevent context
+ * @param[in] run_ctx Run_proc context
+ * @param[in] prog The path to the executable
+ * @param[in] argv Arguments to the executable
+ * @param[in] stdin_fd Assign stdin_fd as stdin for the process, -1 if not
+ * @param[in] timeout How long to wait for execution
+ * @return new tevent request, or NULL on failure
+ *
+ * argv must include program name as argv[0] and must be null terminated.
+ */
+struct tevent_req *run_proc_send(TALLOC_CTX *mem_ctx,
+				 struct tevent_context *ev,
+				 struct run_proc_context *run_ctx,
+				 const char *prog, const char **argv,
+				 int stdin_fd, struct timeval timeout);
+
+/**
+ * @brief Async computation end to run an executable
+ *
+ * @param[in] req Tevent request
+ * @param[out] perr errno in case of failure
+ * @param[out] result The exit status of the executable
+ * @param[out] pid The pid of the child process (still running)
+ * @param[in] mem_ctx Talloc memory context
+ * @param[out] output The output from the executable (stdio + stderr)
+ * @return true on success, false on failure
+ *
+ * The returned pid is -1 if the process has terminated.
+ */
+bool run_proc_recv(struct tevent_req *req, int *perr,
+		   struct run_proc_result *result, pid_t *pid,
+		   TALLOC_CTX *mem_ctx, char **output);
+
+#endif /* __CTDB_RUN_PROC_H__ */