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authorHarald Welte <laforge@osmocom.org>2019-12-16 23:14:45 +0100
committerHarald Welte <laforge@osmocom.org>2019-12-17 13:49:28 +0100
commitc6a8697800376a02b868cdea8fc1bf55f12798f1 (patch)
treee42f7a62ae2a17efd8f10810dfc63d3e776c0809 /include
parent22c7ec3b60d6544d3042a115d519b9311b6bee45 (diff)
Introduce helper functions for safe fork+exec of processes
In some situations, we want to execute an external shell command in a non-blocking way. Similar to 'system', but without waiting for the child to complete. We also want to close all file descriptors ahead of the exec() and filter + modify the environment. Change-Id: Ib24ac8a083db32e55402ce496a5eabd8749cc888 Related: OS#4332
Diffstat (limited to 'include')
-rw-r--r--include/Makefile.am1
-rw-r--r--include/osmocom/core/exec.h28
2 files changed, 29 insertions, 0 deletions
diff --git a/include/Makefile.am b/include/Makefile.am
index dc6eaa7f..b341ee3c 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -23,6 +23,7 @@ nobase_include_HEADERS = \
osmocom/core/crcgen.h \
osmocom/core/endian.h \
osmocom/core/defs.h \
+ osmocom/core/exec.h \
osmocom/core/fsm.h \
osmocom/core/gsmtap.h \
osmocom/core/gsmtap_util.h \
diff --git a/include/osmocom/core/exec.h b/include/osmocom/core/exec.h
new file mode 100644
index 00000000..6bbd352c
--- /dev/null
+++ b/include/osmocom/core/exec.h
@@ -0,0 +1,28 @@
+#pragma once
+/* (C) 2019 by Harald Welte <laforge@gnumonks.org>
+ *
+ * All Rights Reserved
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
+ * 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 2 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+extern const char *osmo_environment_whitelist[];
+
+int osmo_environment_filter(char **out, size_t out_len, char **in, const char **whitelist);
+int osmo_environment_append(char **out, size_t out_len, char **in);
+int osmo_close_all_fds_above(int last_fd_to_keep);
+int osmo_system_nowait(const char *command, const char **env_whitelist, char **addl_env);