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openmpi/opal/util/path.c
Samuel Gutierrez 1f24f1d305 Update the data types used in opaldf to minimize the chance of overflow when 
determining the amount of available space. Thanks to Eugene for pointing out the
issue.

This commit was SVN r27436.
2012-10-11 16:11:23 +00:00

609 строки
18 KiB
C
Исходник Ответственный История

/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2007 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* Copyright (c) 2009-2012 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2010 IBM Corporation. All rights reserved.
* Copyright (c) 2012 Los Alamos National Security, LLC.
* All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "opal_config.h"
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SHLWAPI_H
#include <shlwapi.h>
#endif
#ifdef HAVE_SYS_MOUNT_H
#include <sys/mount.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_SYS_VFS_H
#include <sys/vfs.h>
#endif
#ifdef HAVE_SYS_STATFS_H
#include <sys/statfs.h>
#endif
#ifdef HAVE_SYS_MOUNT_H
#include <sys/mount.h>
#endif
#include "opal_stdint.h"
#include "opal/util/output.h"
#include "opal/util/path.h"
#include "opal/util/os_path.h"
#include "opal/util/argv.h"
static void path_env_load(char *path, int *pargc, char ***pargv);
static char *list_env_get(char *var, char **list);
bool opal_path_is_absolute( const char *path )
{
#if defined(__WINDOWS__)
/* On Windows an absolute path always start with [a-z]:\ or with \\ */
if( (isalpha(path[0]) && (':' == path[1])) ||
('\\' == path[0]) && ('\\' == path[1]) ) return true;
#else
if( OPAL_PATH_SEP[0] == *path ) {
return true;
}
#endif /* defined(__WINDOWS__) */
return false;
}
/**
* Locates a file with certain permissions
*/
char *opal_path_find(char *fname, char **pathv, int mode, char **envv)
{
char *fullpath;
char *delimit;
char *env;
char *pfix;
int i;
/* If absolute path is given, return it without searching. */
if( opal_path_is_absolute(fname) ) {
return opal_path_access(fname, "", mode);
}
/* Initialize. */
fullpath = NULL;
i = 0;
/* Consider each directory until the file is found. Thus, the
order of directories is important. */
while (pathv[i] && NULL == fullpath) {
/* Replace environment variable at the head of the string. */
if ('$' == *pathv[i]) {
delimit = strchr(pathv[i], OPAL_PATH_SEP[0]);
if (delimit) {
*delimit = '\0';
}
env = list_env_get(pathv[i]+1, envv);
if (delimit) {
*delimit = OPAL_PATH_SEP[0];
}
if (NULL != env) {
if (!delimit) {
fullpath = opal_path_access(fname, env, mode);
} else {
pfix = (char*) malloc(strlen(env) + strlen(delimit) + 1);
if (NULL == pfix) {
return NULL;
}
strcpy(pfix, env);
strcat(pfix, delimit);
fullpath = opal_path_access(fname, pfix, mode);
free(pfix);
}
}
}
else {
fullpath = opal_path_access(fname, pathv[i], mode);
}
i++;
}
return opal_make_filename_os_friendly(fullpath);
}
/*
* Locates a file with certain permissions from a list of search paths
*/
char *opal_path_findv(char *fname, int mode, char **envv, char *wrkdir)
{
char **dirv;
char *fullpath;
char *path;
int dirc;
int i;
bool found_dot = false;
/* Set the local search paths. */
dirc = 0;
dirv = NULL;
if (NULL != (path = list_env_get("PATH", envv))) {
path_env_load(path, &dirc, &dirv);
}
/* Replace the "." path by the working directory. */
if (NULL != wrkdir) {
for (i = 0; i < dirc; ++i) {
if (0 == strcmp(dirv[i], ".")) {
found_dot = true;
free(dirv[i]);
dirv[i] = strdup(wrkdir);
if (NULL == dirv[i]){
return NULL;
}
}
}
}
/* If we didn't find "." in the path and we have a wrkdir, append
the wrkdir to the end of the path */
if (!found_dot && NULL != wrkdir) {
opal_argv_append(&dirc, &dirv, wrkdir);
}
if(NULL == dirv)
return NULL;
fullpath = opal_path_find(fname, dirv, mode, envv);
opal_argv_free(dirv);
return fullpath;
}
/**
* Forms a complete pathname and checks it for existance and
* permissions
*
* Accepts:
* -fname File name
* -path Path prefix
* -mode Target permissions which must be satisfied
*
* Returns:
* -Full pathname of located file Success
* -NULL Failure
*/
char *opal_path_access(char *fname, char *path, int mode)
{
char *fullpath = NULL;
struct stat buf;
/* Allocate space for the full pathname. */
if (NULL == path) {
fullpath = opal_os_path(false, fname, NULL);
} else {
fullpath = opal_os_path(false, path, fname, NULL);
}
if (NULL == fullpath)
return NULL;
/* first check to see - is this a file or a directory? We
* only want files
*/
if (0 != stat(fullpath, &buf)) {
/* couldn't stat the path - obviously, this also meets the
* existence check, if that was requested
*/
free(fullpath);
return NULL;
}
if (!(S_IFREG & buf.st_mode) &&
!(S_IFLNK & buf.st_mode)) {
/* this isn't a regular file or a symbolic link, so
* ignore it
*/
free(fullpath);
return NULL;
}
/* check the permissions */
if ((X_OK & mode) && !(S_IXUSR & buf.st_mode)) {
/* if they asked us to check executable permission,
* and that isn't set, then return NULL
*/
free(fullpath);
return NULL;
}
if ((R_OK & mode) && !(S_IRUSR & buf.st_mode)) {
/* if they asked us to check read permission,
* and that isn't set, then return NULL
*/
free(fullpath);
return NULL;
}
if ((W_OK & mode) && !(S_IWUSR & buf.st_mode)) {
/* if they asked us to check write permission,
* and that isn't set, then return NULL
*/
free(fullpath);
return NULL;
}
/* must have met all criteria! */
return fullpath;
}
/**
*
* Loads argument array with $PATH env var.
*
* Accepts
* -path String contiaing the $PATH
* -argc Pointer to argc
* -argv Pointer to list of argv
*/
static void path_env_load(char *path, int *pargc, char ***pargv)
{
char *p;
char saved;
if (NULL == path) {
*pargc = 0;
return;
}
/* Loop through the paths (delimited by PATHENVSEP), adding each
one to argv. */
while ('\0' != *path) {
/* Locate the delimiter. */
for (p = path; *p && (*p != OPAL_ENV_SEP); ++p) {
continue;
}
/* Add the path. */
if (p != path) {
saved = *p;
*p = '\0';
opal_argv_append(pargc, pargv, path);
*p = saved;
path = p;
}
/* Skip past the delimiter, if present. */
if (*path) {
++path;
}
}
}
/**
* Gets value of variable in list or environment. Looks in the list first
*
* Accepts:
* -var String variable
* -list Pointer to environment list
*
* Returns:
* -List Pointer to environment list Success
* -NULL Failure
*/
static char *list_env_get(char *var, char **list)
{
size_t n;
if (NULL != list) {
n = strlen(var);
while (NULL != *list) {
if ((0 == strncmp(var, *list, n)) && ('=' == (*list)[n])) {
return (*list + n + 1);
}
++list;
}
}
return getenv(var);
}
/**
* Try to figure out the absolute path based on the application name
* (usually argv[0]). If the path is already absolute return a copy, if
* it start with . look into the current directory, if not dig into
* the $PATH.
* In case of error or if executable was not found (as an example if
* the application did a cwd between the start and this call), the
* function will return NULL. Otherwise, an newly allocated string
* will be returned.
*/
char* opal_find_absolute_path( char* app_name )
{
char* abs_app_name;
char cwd[OPAL_PATH_MAX], *pcwd;
if( opal_path_is_absolute(app_name) ) { /* already absolute path */
abs_app_name = app_name;
} else if ( '.' == app_name[0] ||
NULL != strchr(app_name, OPAL_PATH_SEP[0])) {
/* the app is in the current directory or below it */
pcwd = getcwd( cwd, OPAL_PATH_MAX );
if( NULL == pcwd ) {
/* too bad there is no way we can get the app absolute name */
return NULL;
}
abs_app_name = opal_os_path( false, pcwd, app_name, NULL );
} else {
/* Otherwise try to search for the application in the PATH ... */
abs_app_name = opal_path_findv( app_name, X_OK, NULL, NULL );
}
if( NULL != abs_app_name ) {
char* resolved_path = (char*)malloc(OPAL_PATH_MAX);
#if !defined(__WINDOWS__)
realpath( abs_app_name, resolved_path );
#else
#ifdef HAVE_SHLWAPI_H
PathCanonicalize(resolved_path, abs_app_name);
#endif
#endif /* !defined(__WINDOWS__) */
if( abs_app_name != app_name ) free(abs_app_name);
return resolved_path;
}
return NULL;
}
/**
* @brief Figure out, whether fname is on network file system
*
* Try to figure out, whether the file name specified through fname is
* on any network file system (currently NFS, Lustre, Panasas and GPFS).
*
* If the file is not created, the parent directory is checked.
* This allows checking for NFS prior to opening the file.
*
* @param[in] fname File name to check
*
* @retval true If fname is on NFS, Lustre, Panasas or GPFS
* @retval false otherwise
*
*
* Linux:
* statfs(const char *path, struct statfs *buf);
* with fsid_t f_fsid; (in kernel struct{ int val[2] };)
* return 0 success, -1 on failure with errno set.
* statvfs (const char *path, struct statvfs *buf);
* with unsigned long f_fsid; -- returns wrong info
* return 0 success, -1 on failure with errno set.
* Solaris:
* statvfs (const char *path, struct statvfs *buf);
* with f_basetype, contains a string of length FSTYPSZ
* return 0 success, -1 on failure with errno set.
* FreeBSD:
* statfs(const char *path, struct statfs *buf);
* with f_fstypename, contains a string of length MFSNAMELEN
* return 0 success, -1 on failure with errno set.
* compliant with: 4.4BSD.
* Mac OSX (10.6.2):
* statvfs(const char * restrict path, struct statvfs * restrict buf);
* with fsid Not meaningful in this implementation.
* is just a wrapper around statfs()
* statfs(const char *path, struct statfs *buf);
* with f_fstypename, contains a string of length MFSTYPENAMELEN
* return 0 success, -1 on failure with errno set.
* Windows (interix):
* statvfs(const char *path, struct statvfs *buf);
* with unsigned long f_fsid
* return 0 success, -1 on failure with errno set.
*/
#ifndef LL_SUPER_MAGIC
#define LL_SUPER_MAGIC 0x0BD00BD0 /* Lustre magic number */
#endif
#ifndef NFS_SUPER_MAGIC
#define NFS_SUPER_MAGIC 0x6969
#endif
#ifndef PAN_KERNEL_FS_CLIENT_SUPER_MAGIC
#define PAN_KERNEL_FS_CLIENT_SUPER_MAGIC 0xAAD7AAEA /* Panasas FS */
#endif
#ifndef GPFS_SUPER_MAGIC
#define GPFS_SUPER_MAGIC 0x47504653 /* Thats GPFS in ASCII */
#endif
#define MASK2 0xffff
#define MASK4 0xffffffff
bool opal_path_nfs(char *fname)
{
#if !defined(__WINDOWS__)
int i;
int rc;
int trials;
char * file = strdup (fname);
#if defined(__SVR4) && defined(__sun)
struct statvfs buf;
#elif defined(__linux__) || defined (__BSD) || (defined(__APPLE__) && defined(__MACH__))
struct statfs buf;
#endif
/*
* Be sure to update the test (test/util/opal_path_nfs.c)
* while adding a new Network/Cluster Filesystem here
*/
static struct fs_types_t {
unsigned long long f_fsid;
unsigned long long f_mask;
const char * f_fsname;
} fs_types[] = {
{LL_SUPER_MAGIC, MASK4, "lustre"},
{NFS_SUPER_MAGIC, MASK2, "nfs"},
{PAN_KERNEL_FS_CLIENT_SUPER_MAGIC, MASK4, "panfs"},
{GPFS_SUPER_MAGIC, MASK4, "gpfs"}
};
#define FS_TYPES_NUM (int)(sizeof (fs_types)/sizeof (fs_types[0]))
/*
* First, get the OS-dependent struct stat(v)fs buf
* This may return the ESTALE error on NFS, if the underlying file/path has changed
*/
again:
trials = 5;
do {
#if defined(__SVR4) && defined(__sun)
rc = statvfs (file, &buf);
#elif defined(__linux__) || defined (__BSD) || (defined(__APPLE__) && defined(__MACH__))
rc = statfs (file, &buf);
#endif
} while (-1 == rc && ESTALE == errno && (0 < --trials));
/* In case some error with the current filename, try the directory */
if (-1 == rc) {
char * last_sep;
OPAL_OUTPUT_VERBOSE((10, 0, "opal_path_nfs: stat(v)fs on file:%s failed errno:%d directory:%s\n",
fname, errno, file));
last_sep = strrchr(file, OPAL_PATH_SEP[0]);
/* Stop the search, when we have searched past root '/' */
if (NULL == last_sep || (1 == strlen(last_sep) &&
OPAL_PATH_SEP[0] == *last_sep)) {
free (file);
return false;
}
*last_sep = '\0';
goto again;
}
/* Next, extract the magic value */
#if defined(__SVR4) && defined(__sun)
for (i = 0; i < FS_TYPES_NUM; i++)
if (0 == strncasecmp (fs_types[i].f_fsname, buf.f_basetype, FSTYPSZ))
goto found;
#elif (defined(__APPLE__) && defined(__MACH__))
for (i = 0; i < FS_TYPES_NUM; i++)
if (0 == strncasecmp (fs_types[i].f_fsname, buf.f_fstypename, MFSTYPENAMELEN))
goto found;
#elif defined(__BSD)
for (i = 0; i < FS_TYPES_NUM; i++)
if (0 == strncasecmp (fs_types[i].f_fsname, buf.f_fstypename, MFSNAMELEN))
goto found;
#elif defined(__linux__)
for (i = 0; i < FS_TYPES_NUM; i++)
if (fs_types[i].f_fsid == (buf.f_type & fs_types[i].f_mask))
goto found;
#endif
free (file);
return false;
found:
OPAL_OUTPUT_VERBOSE((10, 0, "opal_path_nfs: file:%s on fs:%s\n",
fname, fs_types[i].f_fsname));
free (file);
return true;
#undef FS_TYPES_NUM
#else
return false;
#endif /* __WINDOWS__ */
}
int
opal_path_df(const char *path,
uint64_t *out_avail)
{
#if !defined(__WINDOWS__)
int rc = -1;
int trials = 5;
int err = 0;
#if defined(__SVR4) && defined(__sun)
struct statvfs buf;
#elif defined(__linux__) || defined (__BSD) || \
(defined(__APPLE__) && defined(__MACH__))
struct statfs buf;
#endif
if (NULL == path || NULL == out_avail) {
return OPAL_ERROR;
}
*out_avail = 0;
do {
#if defined(__SVR4) && defined(__sun)
rc = statvfs(path, &buf);
#elif defined(__linux__) || defined (__BSD) || \
(defined(__APPLE__) && defined(__MACH__))
rc = statfs(path, &buf);
#endif
err = errno;
} while (-1 == rc && ESTALE == err && (--trials > 0));
if (-1 == rc) {
OPAL_OUTPUT_VERBOSE((10, 2, "opal_path_df: stat(v)fs on "
"path: %s failed with errno: %d (%s)\n",
path, err, strerror(err)));
return OPAL_ERROR;
}
/* now set the amount of free space available on path */
/* sometimes buf.f_bavail is negative */
*out_avail = buf.f_bsize * ((int)buf.f_bavail < 0 ? 0 : buf.f_bavail);
OPAL_OUTPUT_VERBOSE((10, 2, "opal_path_df: stat(v)fs states "
"path: %s has %"PRIu64 " B of free space.",
path, *out_avail));
return OPAL_SUCCESS;
#else /* defined __WINDOWS__ */
*out_avail = 0;
if (!GetDiskFreeSpaceEx(NULL, (PULARGE_INTEGER)out_avail, NULL, NULL)) {
DWORD dwSectorsPerCluster = 0, dwBytesPerSector = 0;
DWORD dwFreeClusters = 0, dwTotalClusters = 0;
if (!GetDiskFreeSpaceA(NULL, &dwSectorsPerCluster,
&dwBytesPerSector, &dwFreeClusters, &dwTotalClusters)) {
OPAL_OUTPUT_VERBOSE((10, 2, "opal_path_df: GetDiskFreeSpaceA on "
"path: %s failed with errno: %d (%s)\n",
path, err, strerror(err)));
return OPAL_ERROR;
}
*out_avail = dwFreeClusters * dwSectorsPerCluster * dwBytesPerSector;
}
OPAL_OUTPUT_VERBOSE((10, 2, "opal_path_df: stat(v)fs states "
"path: %s has %"PRIu64 " B of free space.",
path, *out_avail));
return OPAL_SUCCESS;
#endif /* !defined(__WINDOWS__) */
}
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