1 files changed, 55 insertions, 0 deletions
diff --git a/src/utils/kxdpgun/popenve.h b/src/utils/kxdpgun/popenve.h
new file mode 100644
index 0000000..feb8414
--- /dev/null
+++ b/src/utils/kxdpgun/popenve.h
@@ -0,0 +1,55 @@
+/*  Copyright (C) 2020 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+    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 <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdbool.h>
+#include <stdio.h>
+
+/*!
+ * \brief Hybrid of popen() and execve() returning a file descriptor
+ *
+ * This function is a safer altervative to popen(), it is the same to
+ * popen() as execve() is to system().
+ *
+ * Warning: this function is designed to be as simple as possible,
+ *          for reliable operation proper checking for transient
+ *          error is needed.
+ *
+ * \param binfile   Executable file to be executed.
+ * \param args      NULL-terminated arguments; first shall be the prog name!
+ * \param env       NULL-terminated environment variables "key=value"
+ * \param drop_cap  Drop capabilities for the subprocess.
+ *
+ * \retval < 0   Error occured, set to -errno.
+ * \return > 0   File descriptor of the pipe reading end.
+ */
+int kpopenvef(const char *binfile, char *const args[], char *const env[], bool drop_cap);
+
+/*!
+ * \brief Variant of kpopenvef() returning FILE*
+ *
+ * Warning: the same warning as for kpopenvef() applies here too.
+ *
+ * \param binfile   Executable file to be executed.
+ * \param args      NULL-terminated arguments; first shall be the prog name!
+ * \param env       NULL-terminated environment variables "key=value"
+ * \param drop_cap  Drop capabilities for the subprocess.
+ *
+ * \retval NULL   Error occured, see errno.
+ * \return Pointer to open file descriptor.
+ */
+FILE *kpopenve(const char *binfile, char *const args[], char *const env[], bool drop_cap);