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70 lines
2.4 KiB
C
70 lines
2.4 KiB
C
/*
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* popen_noshell: A faster implementation of popen() and system() for Linux.
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* Copyright (c) 2009 Ivan Zahariev (famzah)
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* Version: 1.0
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; under version 3 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses>.
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*/
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#ifndef POPEN_NOSHELL_H
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#define POPEN_NOSHELL_H
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#include <stdio.h>
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#include <sys/types.h>
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#include <unistd.h>
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/* stack for the child process before it does exec() */
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#define POPEN_NOSHELL_STACK_SIZE 8*1024*1024 /* currently most Linux distros set this to 8 MBytes */
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/* constants to use with popen_noshell_set_fork_mode() */
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#define POPEN_NOSHELL_MODE_CLONE 0 /* default, faster */
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#define POPEN_NOSHELL_MODE_FORK 1 /* slower */
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struct popen_noshell_clone_arg {
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int pipefd_0;
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int pipefd_1;
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int read_pipe;
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int ignore_stderr;
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const char *file;
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const char * const *argv;
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};
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struct popen_noshell_pass_to_pclose {
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FILE *fp;
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pid_t pid;
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int free_clone_mem;
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void *stack;
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struct popen_noshell_clone_arg *func_args;
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};
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/***************************
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* PUBLIC FUNCTIONS FOLLOW *
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***************************/
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/* this is the native function call */
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FILE *popen_noshell(const char *file, const char * const *argv, const char *type, struct popen_noshell_pass_to_pclose *pclose_arg, int ignore_stderr);
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/* more insecure, but more compatible with popen() */
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FILE *popen_noshell_compat(const char *command, const char *type, struct popen_noshell_pass_to_pclose *pclose_arg);
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/* call this when you have finished reading and writing from/to the child process */
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int pclose_noshell(struct popen_noshell_pass_to_pclose *arg); /* the pclose() equivalent */
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/* this is the innovative faster vmfork() which shares memory with the parent and is very resource-light; see the source code for documentation */
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pid_t popen_noshell_vmfork(int (*fn)(void *), void *arg, void **memory_to_free_on_child_exit);
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/* used only for benchmarking purposes */
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void popen_noshell_set_fork_mode(int mode);
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#endif
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