There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
155 lines
4.3 KiB
C
155 lines
4.3 KiB
C
/* $NetBSD: execvp.c,v 1.30 2007/07/20 12:41:07 yamt 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. 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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#include <sys/cdefs.h>
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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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__RCSID("$NetBSD: execvp.c,v 1.30 2007/07/20 12:41:07 yamt Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include <unistd.h>
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#include <paths.h>
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#include "reentrant.h"
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#ifdef __weak_alias
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__weak_alias(execvp,_execvp)
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#endif
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extern char **environ;
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int
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execvp(const char *name, char * const *argv)
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{
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const char **memp;
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int cnt;
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size_t lp, ln;
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int eacces = 0;
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unsigned int etxtbsy = 0;
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char buf[PATH_MAX];
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const char *bp, *path, *p;
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_DIAGASSERT(name != NULL);
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/* "" is not a valid filename; check this before traversing PATH. */
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if (name[0] == '\0') {
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errno = ENOENT;
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goto done;
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}
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ln = strlen(name);
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/* If it's an absolute or relative path name, it's easy. */
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if (strchr(name, '/')) {
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bp = name;
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path = "";
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goto retry;
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}
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bp = buf;
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/* Get the path we're searching. */
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if (!(path = getenv("PATH")))
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path = _PATH_DEFPATH;
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do {
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/* Find the end of this path element. */
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for (p = path; *path != 0 && *path != ':'; path++)
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continue;
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/*
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* It's a SHELL path -- double, leading and trailing colons
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* mean the current directory.
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*/
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if (p == path) {
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p = ".";
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lp = 1;
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} else
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lp = path - p;
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/*
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* If the path is too long complain. This is a possible
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* security issue; given a way to make the path too long
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* the user may execute the wrong program.
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*/
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if (lp + ln + 2 > sizeof(buf)) {
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(void)write(STDERR_FILENO, "execvp: ", 8);
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(void)write(STDERR_FILENO, p, lp);
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(void)write(STDERR_FILENO, ": path too long\n", 16);
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continue;
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}
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memcpy(buf, p, lp);
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buf[lp] = '/';
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memcpy(buf + lp + 1, name, ln);
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buf[lp + ln + 1] = '\0';
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retry: (void)execve(bp, argv, environ);
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switch (errno) {
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case EACCES:
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eacces = 1;
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break;
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case ENOTDIR:
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case ENOENT:
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break;
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case ENOEXEC:
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for (cnt = 0; argv[cnt] != NULL; ++cnt)
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continue;
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/*
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* we can't use malloc here because, if we are doing
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* vfork+exec, it leaks memory in the parent.
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*/
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if ((memp = alloca((cnt + 2) * sizeof(*memp))) == NULL)
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goto done;
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memp[0] = _PATH_BSHELL;
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memp[1] = bp;
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(void)memcpy(&memp[2], &argv[1], cnt * sizeof(*memp));
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(void)execve(_PATH_BSHELL, __UNCONST(memp), environ);
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goto done;
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case ETXTBSY:
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if (etxtbsy < 3)
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(void)sleep(++etxtbsy);
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goto retry;
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default:
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goto done;
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}
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} while (*path++ == ':'); /* Otherwise, *path was NUL */
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if (eacces)
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errno = EACCES;
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else if (!errno)
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errno = ENOENT;
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done:
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return (-1);
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}
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