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Add system(3).

This commit is contained in:
Jonas 'Sortie' Termansen 2013-01-14 19:27:19 +01:00
parent 6b790a3184
commit 2d86b7dcf2
3 changed files with 51 additions and 1 deletions
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1
libc/Makefile
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@ -225,6 +225,7 @@ signal.o \
sleep.o \
stat.o \
stdio.o \
system.o \
tfork.o \
time.o \
truncateat.o \

2
libc/include/stdlib.h
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@ -74,6 +74,7 @@ long strtol(const char* restrict, char** restrict, int);
unsigned long strtoul(const char* restrict, char** restrict, int);
unsigned long long strtoull(const char* restrict, char** restrict, int);
long long strtoll(const char* restrict, char** restrict, int);
int system(const char*);
int unsetenv(const char*);
int wctomb(char*, wchar_t);
@ -130,7 +131,6 @@ void srandom(unsigned);
double strtod(const char* restrict, char** restrict);
float strtof(const char* restrict, char** restrict);
long double strtold(const char* restrict, char** restrict);
int system(const char*);
int unlockpt(int);
size_t wcstombs(char* restrict, const wchar_t *restrict, size_t);

49
libc/system.cpp Normal file
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@ -0,0 +1,49 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
system.cpp
Execute a shell command.
*******************************************************************************/
#include <sys/wait.h>
#include <stdlib.h>
#include <unistd.h>
extern "C" int system(const char* command)
{
const int ret_error = command ? -1 : 0;
const int exit_error = command ? 127 : 0;
if ( !command )
command = "exit 1";
// TODO: Block SIGHCHLD, SIGINT, anda SIGQUIT while waiting.
pid_t childpid = fork();
if ( childpid < 0 )
return ret_error;
if ( childpid )
{
int status;
if ( waitpid(childpid, &status, 0) < 0 )
return ret_error;
return status;
}
execlp("sh", "sh", "-c", command, NULL);
_exit(exit_error);
}