90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#define execl _execl
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#define execve _execve
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#include <unistd.h>
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#include <minix/compiler.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <sys/types.h>
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#include <stdlib.h>
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#include <alloca.h>
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#include <lib.h>
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#ifndef __UNCONST
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#define __UNCONST(x) ((void *) (x))
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#endif
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extern char * const **_penviron; /* The default environment. */
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int
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execl(const char *path, const char *arg, ...)
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/* execl("/bin/sh", "sh", "-c", "example", (char *) 0); */
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{
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#if FUNC_ARGS_ARRAY
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/*
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* Assumption: The C-implementation for this machine pushes
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* function arguments downwards on the stack making a perfect
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* argument array. Luckily this is almost always so.
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*
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* execl() - execute Author: Kees J. Bot, 21 Jan 1994
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*/
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return execve(path, (char * const *) &arg, *_penviron);
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#else
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/*
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* Indeed, GCC (4.4.1) behaves similarly to ACK. Nonetheless, let's
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* stay the safe side. LLVM (llvm-gcc) doesn't make the aforementioned
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* assumption.
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*/
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va_list ap;
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char **argv;
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int i;
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va_start(ap, arg);
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for (i = 2; va_arg(ap, char *) != NULL; i++)
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continue;
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va_end(ap);
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if ((argv = alloca(i * sizeof (char *))) == NULL) {
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errno = ENOMEM;
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return -1;
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}
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va_start(ap, arg);
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argv[0] = __UNCONST(arg);
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for (i = 1; (argv[i] = va_arg(ap, char *)) != NULL; i++)
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continue;
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va_end(ap);
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return execve(path, (char * const *) argv, *_penviron);
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#endif
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}
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