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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#pragma ident "%Z%%M% %I% %E% SMI"
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#pragma weak _isaexec = isaexec
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#include "lint.h"
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#include <sys/types.h>
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#include <sys/systeminfo.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdarg.h>
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#include <stdlib.h>
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/*
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* This is a utility routine to allow wrapper programs to simply
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* implement the isalist exec algorithms. See PSARC/1997/220.
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*/
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int
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isaexec(const char *execname, char *const *argv, char *const *envp)
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{
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const char *fname;
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char *isalist;
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char *pathname;
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char *str;
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char *lasts;
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size_t isalen = 255; /* wild guess */
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size_t len;
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int saved_errno;
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/*
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* Extract the isalist(5) for userland from the kernel.
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*/
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isalist = malloc(isalen);
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do {
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long ret = sysinfo(SI_ISALIST, isalist, isalen);
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if (ret == -1l) {
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free(isalist);
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errno = ENOENT;
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return (-1);
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}
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if (ret > isalen) {
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isalen = ret;
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isalist = realloc(isalist, isalen);
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} else
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break;
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} while (isalist != NULL);
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if (isalist == NULL) {
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/*
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* Then either a malloc or a realloc failed.
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*/
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errno = EAGAIN;
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return (-1);
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}
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/*
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* Allocate a full pathname buffer. The sum of the lengths of the
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* 'path' and isalist strings is guaranteed to be big enough.
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*/
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len = strlen(execname) + isalen;
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if ((pathname = malloc(len)) == NULL) {
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free(isalist);
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errno = EAGAIN;
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return (-1);
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}
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/*
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* Break the exec name into directory and file name components.
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*/
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(void) strcpy(pathname, execname);
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if ((str = strrchr(pathname, '/')) != NULL) {
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*++str = '\0';
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fname = execname + (str - pathname);
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} else {
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fname = execname;
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*pathname = '\0';
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}
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len = strlen(pathname);
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/*
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* For each name in the isa list, look for an executable file
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* with the given file name in the corresponding subdirectory.
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* If it's there, exec it. If it's not there, or the exec
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* fails, then run the next version ..
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*/
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str = strtok_r(isalist, " ", &lasts);
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saved_errno = ENOENT;
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do {
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(void) strcpy(pathname + len, str);
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(void) strcat(pathname + len, "/");
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(void) strcat(pathname + len, fname);
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if (access(pathname, X_OK) == 0) {
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/*
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* File exists and is marked executable. Attempt
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* to execute the file from the subdirectory,
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* using the user-supplied argv and envp.
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*/
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(void) execve(pathname, argv, envp);
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/*
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* If we failed to exec because of a temporary
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* resource shortage, it's better to let our
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* caller handle it (free memory, sleep for a while,
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* or whatever before retrying) rather than drive
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* on to run the "less capable" version.
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*/
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if (errno == EAGAIN) {
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saved_errno = errno;
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break;
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}
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}
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} while ((str = strtok_r(NULL, " ", &lasts)) != NULL);
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free(pathname);
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free(isalist);
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errno = saved_errno;
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return (-1);
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}
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