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/* 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);
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