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sortix--sortix/libc/unistd/execle.cpp
2014-07-20 15:09:16 +02:00

64 lines
1.8 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 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/>.
unistd/execle.cpp
Loads a program image.
*******************************************************************************/
#include <stdarg.h>
#include <stdlib.h>
#include <unistd.h>
extern "C" int execle(const char* pathname, const char* argv0, ...)
{
if ( !argv0 )
{
va_list args;
va_start(args, argv0);
char* const* envp = va_arg(args, char* const*);
va_end(args);
return execve(pathname, (char* const*) &argv0, envp);
}
va_list args;
va_start(args, argv0);
size_t numargs = 1;
while ( argv0 && va_arg(args, const char*) )
numargs++;
va_end(args);
char** argv = (char**) malloc(sizeof(char*) * (numargs+1));
if ( !argv )
return -1;
argv[0] = (char*) argv0;
va_start(args, argv0);
for ( size_t i = 1; i <= numargs; i++ )
argv[i] = (char*) va_arg(args, const char*);
char* const* envp = va_arg(args, char* const*);
va_end(args);
argv[numargs] = NULL;
int result = execve(pathname, argv, envp);
free(argv);
return result;
}