60485ff95f
OMPI_* to OPAL_*. This allows opal layer to be used more independent from the whole of ompi. NOTE: 9 "svn mv" operations immediately follow this commit. This commit was SVN r21180.
94 строки
2.5 KiB
C
94 строки
2.5 KiB
C
/*
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* Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "opal_config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include "opal/util/opal_getcwd.h"
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#include "opal/constants.h"
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/*
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* Use $PWD instead of getcwd() a) if $PWD exists and b) is a valid
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* synonym for the results from getcwd(). If both of these conditions
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* are not met, just fall back and use the results of getcwd().
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*/
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int opal_getcwd(char *buf, size_t size)
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{
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char cwd[OPAL_PATH_MAX];
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char *pwd = getenv("PWD");
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struct stat a, b;
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/* Bozo checks (e.g., if someone accidentally passed -1 to the
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unsigned "size" param) */
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if (NULL == buf || size > INT_MAX) {
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return OPAL_ERR_BAD_PARAM;
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}
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/* Call getcwd() to get a baseline result */
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if (NULL == getcwd(cwd, sizeof(cwd))) {
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return OPAL_ERR_IN_ERRNO;
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}
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#if !defined(HAVE_SYS_STAT_H)
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/* If we don't have stat(), then we can't tell if the $PWD and cwd
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are the same, so just fall back to getcwd(). */
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pwd = cwd;
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#else
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if (NULL == pwd) {
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pwd = cwd;
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} else {
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/* If the two are not the same value, figure out if they are
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pointing to the same place */
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if (0 != strcmp(pwd, cwd)) {
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/* If we can't stat() what getcwd() gave us, give up */
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if (0 != stat(cwd, &a)) {
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return OPAL_ERR_IN_ERRNO;
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}
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/* If we can't stat() $PWD, then $PWD could just be stale
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-- so ignore it. */
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else if (0 != stat(pwd, &b)) {
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pwd = cwd;
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}
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/* Otherwise, we successfully stat()'ed them both, so
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compare. If either the device or inode is not the
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same, then fallback to getcwd(). */
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else {
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if (a.st_dev != b.st_dev || a.st_ino != b.st_ino) {
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pwd = cwd;
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}
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}
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}
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}
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#endif
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/* If we got here, pwd is pointing to the result that we want to
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give. Ensure the user's buffer is long enough. If it is, copy
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in the value and be done. */
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if (strlen(pwd) > size) {
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return OPAL_ERR_TEMP_OUT_OF_RESOURCE;
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}
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strncpy(buf, pwd, size);
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return OPAL_SUCCESS;
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}
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