a0d2fe2548
passed to the execl(), execle(), and execlp() functions are in the form of the argument vector to be passed to execve(). On these architectures, it is unnecessary to count the number of arguments, allocate space on the stack, copy the arguments, etc. The vector already on the stack can be used instead. When some arguments are passed in registers (like most RISC CPU's), it should be possible to allocate stack space adjacent such that the registers can be copied to that memory. After that, the same approach described above can be used. This change takes advantage of this on the i386, m68k, and ns32k. It is probably true on the vax, but I am unable to check. RISC CPU's probably need assembly language implementations to ensure everything is placed exactly as needed when registers are copied to the stack...
88 lines
2.8 KiB
C
88 lines
2.8 KiB
C
/* $NetBSD: execlp.c,v 1.2 1996/07/04 07:19:07 jtc Exp $ */
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/*-
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)exec.c 8.1 (Berkeley) 6/4/93";
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#else
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static char rcsid[] = "$NetBSD: execlp.c,v 1.2 1996/07/04 07:19:07 jtc Exp $";
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include <stdlib.h>
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#include <unistd.h>
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#if __STDC__
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#include <stdarg.h>
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#define VA_START(ap, last) va_start(ap, last)
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#else
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#include <varargs.h>
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#define VA_START(ap, last) va_start(ap)
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#endif
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int
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#if __STDC__
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execlp(const char *name, const char *arg, ...)
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#else
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execlp(name, arg, va_alist)
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const char *name;
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const char *arg;
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va_dcl
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#endif
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{
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#if defined(__i386__) || defined(__m68k__) || defined(__ns32k__)
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return execvp(name, (char **) &arg);
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#else
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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 = 1; va_arg(ap, char *) != NULL; i++)
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;
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va_end(ap);
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argv = alloca (i * sizeof (char *));
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VA_START(ap, arg);
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argv[0] = (char *) arg;
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for (i = 1; (argv[i] = va_arg(ap, char *)) != NULL; i++)
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;
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va_end(ap);
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return execvp(name, argv);
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#endif
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}
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