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boinc/lib/filesys.C

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// Berkeley Open Infrastructure for Network Computing
// http://boinc.berkeley.edu
// Copyright (C) 2005 University of California
//
// This is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation;
// either version 2.1 of the License, or (at your option) any later version.
//
// This software is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU Lesser General Public License for more details.
//
// To view the GNU Lesser General Public License visit
// http://www.gnu.org/copyleft/lesser.html
// or write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#if defined(_WIN32) && !defined(__STDWX_H__) && !defined(_BOINC_WIN_) && !defined(_AFX_STDAFX_H_)
#include "boinc_win.h"
#endif
#if !defined(_WIN32) || defined(__CYGWIN32__)
#include "config.h"
#include <cstdio>
#include <fcntl.h>
#include <cerrno>
#include <sys/stat.h>
#include <sys/file.h>
#include <ctime>
#include <cstring>
#include <cstdlib>
#include <sys/time.h>
#include <unistd.h>
#include <dirent.h>
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#ifdef HAVE_SYS_MOUNT_H
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#include <sys/mount.h>
#endif
#ifdef HAVE_SYS_STATVFS_H
#include <sys/statvfs.h>
#define STATFS statvfs
#elif defined(HAVE_SYS_STATFS_H)
#include <sys/statfs.h>
#define STATFS statfs
#else
#define STATFS statfs
#endif
#endif
#ifdef _WIN32
typedef BOOL (CALLBACK* FreeFn)(LPCTSTR, PULARGE_INTEGER, PULARGE_INTEGER, PULARGE_INTEGER);
#endif
#include "util.h"
#include "error_numbers.h"
#include "filesys.h"
#ifdef _USING_FCGI_
#include "fcgi_stdio.h"
#endif
using std::string;
char boinc_failed_file[256];
// routines for enumerating the entries in a directory
int is_file(const char* path) {
struct stat sbuf;
int retval = stat(path, &sbuf);
return (!retval && (sbuf.st_mode & S_IFREG));
}
int is_dir(const char* path) {
struct stat sbuf;
int retval = stat(path, &sbuf);
return (!retval && (sbuf.st_mode & S_IFDIR));
}
// Open a directory
//
DIRREF dir_open(const char* p) {
DIRREF dirp;
#ifdef HAVE_DIRENT_H
dirp = opendir(p);
if (!dirp) return NULL;
#elif defined(_WIN32)
if (!is_dir(p)) return NULL;
dirp = (DIR_DESC*) calloc(sizeof(DIR_DESC), 1);
dirp->first = true;
safe_strcpy(dirp->path, p);
strcat(dirp->path, "\\*");
dirp->handle = INVALID_HANDLE_VALUE;
#endif
return dirp;
}
// Scan through a directory and return the next file name in it
//
int dir_scan(char* p, DIRREF dirp, int p_len) {
#ifdef HAVE_DIRENT_H
while (1) {
dirent* dp = readdir(dirp);
if (dp) {
if (!strcmp(dp->d_name, ".")) continue;
if (!strcmp(dp->d_name, "..")) continue;
if (p) strlcpy(p, dp->d_name, p_len);
return 0;
} else {
return ERR_READDIR;
}
}
#elif defined(_WIN32)
WIN32_FIND_DATA data;
while (1) {
if (dirp->first) {
dirp->first = false;
dirp->handle = FindFirstFile(dirp->path, &data);
if (dirp->handle == INVALID_HANDLE_VALUE) {
return ERR_READDIR;
} else {
// does Windows have "." and ".."? well, just in case.
//
if (!strcmp(data.cFileName, ".")) continue;
if (!strcmp(data.cFileName, "..")) continue;
if (p) strlcpy(p, data.cFileName, p_len);
return 0;
}
} else {
if (FindNextFile(dirp->handle, &data)) {
if (!strcmp(data.cFileName, ".")) continue;
if (!strcmp(data.cFileName, "..")) continue;
if (p) strlcpy(p, data.cFileName, p_len);
return 0;
} else {
FindClose(dirp->handle);
dirp->handle = INVALID_HANDLE_VALUE;
return 1;
}
}
}
#endif
}
// Close a directory
//
void dir_close(DIRREF dirp) {
#ifdef HAVE_DIRENT_H
if (dirp) {
closedir(dirp);
}
#elif defined(_WIN32)
if (dirp->handle != INVALID_HANDLE_VALUE) {
FindClose(dirp->handle);
dirp->handle = INVALID_HANDLE_VALUE;
}
free(dirp);
#endif
}
DirScanner::DirScanner(string const& path) {
#ifdef HAVE_DIRENT_H
dirp = opendir(path.c_str());
#elif defined(_WIN32)
first = true;
handle = INVALID_HANDLE_VALUE;
if (!is_dir((char*)path.c_str())) {
return;
}
dir = path + "\\*";
#endif
}
// Scan through a directory and return the next file name in it
//
bool DirScanner::scan(string& s) {
#ifdef HAVE_DIRENT_H
if (!dirp) return false;
while (1) {
dirent* dp = readdir(dirp);
if (dp) {
if (dp->d_name[0] == '.') continue;
s = dp->d_name;
return true;
} else {
return false;
}
}
#elif defined(_WIN32)
WIN32_FIND_DATA data;
while (1) {
if (first) {
first = false;
handle = FindFirstFile(dir.c_str(), &data);
if (handle == INVALID_HANDLE_VALUE) {
return false;
} else {
if (data.cFileName[0] == '.') continue;
s = data.cFileName;
return true;
}
} else {
if (FindNextFile(handle, &data)) {
if (data.cFileName[0] == '.') continue;
s = data.cFileName;
return true;
} else {
FindClose(handle);
handle = INVALID_HANDLE_VALUE;
return false;
}
}
}
#endif
}
// Close a directory
DirScanner::~DirScanner() {
#ifdef HAVE_DIRENT_H
if (dirp) {
closedir(dirp);
}
#elif defined(_WIN32)
if (handle != INVALID_HANDLE_VALUE) {
FindClose(handle);
}
#endif
}
// Delete the file located at path
//
int boinc_delete_file(const char* path) {
int retval = 0;
if (!boinc_file_exists(path)) {
return 0;
}
#ifdef _WIN32
for (int i=0; i<5; i++) {
retval = remove(path);
if (!retval) break;
boinc_sleep(drand()); // avoid lockstep
}
#else
retval = unlink(path);
#endif
if (retval) {
safe_strcpy(boinc_failed_file, path);
return ERR_UNLINK;
}
return 0;
}
// get file size
//
int file_size(const char* path, double& size) {
struct stat sbuf;
int retval;
retval = stat(path, &sbuf);
if (retval) return ERR_NOT_FOUND;
size = (double)sbuf.st_size;
return 0;
}
int boinc_truncate(const char* path, double size) {
int retval;
#ifdef _WIN32
// the usual Windows nightmare.
// There's another function, SetEndOfFile(),
// that supposedly works with files over 2GB,
// but it uses HANDLES
//
int fd = _open(path, _O_RDWR, 0);
if (fd == -1) return ERR_TRUNCATE;
retval = _chsize(fd, (long)size);
_close(fd);
#else
retval = truncate(path, (off_t)size);
#endif
if (retval) return ERR_TRUNCATE;
return 0;
}
// removes all files from specified directory
//
int clean_out_dir(const char* dirpath) {
char filename[256], path[256];
int retval;
DIRREF dirp;
dirp = dir_open(dirpath);
if (!dirp) return 0; // if dir doesn't exist, it's empty
while (1) {
strcpy(filename, "");
retval = dir_scan(filename, dirp, sizeof(filename));
if (retval) break;
sprintf(path, "%s/%s", dirpath, filename);
clean_out_dir(path);
boinc_rmdir(path);
retval = boinc_delete_file(path);
if (retval) {
dir_close(dirp);
return retval;
}
}
dir_close(dirp);
return 0;
}
// return total size of files in directory and its subdirectories
//
int dir_size(const char* dirpath, double& size) {
char filename[256], subdir[256];
int retval=0;
DIRREF dirp;
double x;
size = 0;
dirp = dir_open(dirpath);
if (!dirp) return ERR_OPENDIR;
while (1) {
retval = dir_scan(filename, dirp, sizeof(filename));
if (retval) break;
sprintf(subdir, "%s/%s", dirpath, filename);
// We don't know if this entry is a file or a directory.
// dir_size() will return -1 if it's a file
//
retval = dir_size(subdir, x);
if (retval == 0) {
size += x;
} else {
retval = file_size(subdir, x);
if (retval) continue;
size += x;
}
}
dir_close(dirp);
return 0;
}
FILE* boinc_fopen(const char* path, const char* mode) {
FILE* f;
// if opening for read, and file isn't there,
// leave now (avoid 5-second delay!!)
//
if (strchr(mode, 'r')) {
if (!boinc_file_exists(path)) {
return 0;
}
}
f = fopen(path, mode);
#ifdef _WIN32
// on Windows: if fopen fails, try again for 5 seconds
// (since the file might be open by FastFind, Diskeeper etc.)
//
if (!f) {
for (int i=0; i<5; i++) {
boinc_sleep(drand());
f = fopen(path, mode);
if (f) break;
}
}
#else
// Unix - if call was interrupted, retry a few times
//
if (!f) {
for (int i=0; i<5; i++) {
if (errno != EINTR) break;
f = fopen(path, mode);
if (f) break;
}
}
if (f) {
fcntl(fileno(f), F_SETFD, FD_CLOEXEC);
}
#endif
return f;
}
int boinc_file_exists(const char* path) {
struct stat buf;
if (stat(path, &buf)) {
return false; // stat() returns zero on success
}
return true;
}
// returns zero on success, nonzero if didn't touch file
//
int boinc_touch_file(const char *path) {
FILE *fp;
if (boinc_file_exists(path)) {
return 0;
}
if ((fp=fopen(path, "w"))) {
fclose(fp);
return 0;
}
return -1;
}
int boinc_copy(const char* orig, const char* newf) {
#ifdef _WIN32
if (CopyFile(orig, newf, FALSE)) {
return 0;
} else {
return GetLastError();
}
#elif defined(__EMX__)
char cmd[256];
sprintf(cmd, "copy %s %s", orig, newf);
return system(cmd);
#else
char cmd[256];
sprintf(cmd, "cp %s %s", orig, newf);
return system(cmd);
#endif
}
int boinc_rename(const char* old, const char* newf) {
#ifdef _WIN32
int retval=0;
boinc_delete_file(newf);
for (int i=0; i<5; i++) {
retval = rename(old, newf);
if (!retval) break;
boinc_sleep(drand()); // avoid lockstep
}
return retval;
#else
return rename(old, newf);
#endif
}
int boinc_mkdir(const char* path) {
if (is_dir(path)) return 0;
#ifdef _WIN32
return !CreateDirectory(path, NULL);
#else
return mkdir(path, 0777);
#endif
}
int boinc_rmdir(const char* name) {
#ifdef _WIN32
return !RemoveDirectory(name);
#else
return rmdir(name);
#endif
}
// if "filepath" is of the form a/b/c,
// create directories dirpath/a, dirpath/a/b etc.
//
int boinc_make_dirs(const char* dirpath, const char* filepath) {
char buf[1024], oldpath[1024], newpath[1024];
int retval;
char *p, *q;
if (strlen(filepath) + strlen(dirpath) > 1023) return ERR_BUFFER_OVERFLOW;
strcpy(buf, filepath);
q = buf;
while(*q) {
p = strchr(q, '/');
if (!p) break;
*p = 0;
sprintf(newpath, "%s/%s", oldpath, q);
retval = boinc_mkdir(newpath);
if (retval) return retval;
strcpy(oldpath, newpath);
q = p+1;
}
return 0;
}
int FILE_LOCK::lock(const char* filename) {
int retval=0;
#if defined(_WIN32) && !defined(__CYGWIN32__)
handle = CreateFile(
filename, GENERIC_WRITE,
0, 0, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0
);
if (handle == INVALID_HANDLE_VALUE) {
retval = 1;
}
// some systems have both!
#elif defined(HAVE_LOCKF) && !defined(__APPLE__)
fd = open(filename, O_WRONLY|O_CREAT, 0644);
retval = lockf(fd, F_TLOCK, 0);
#elif HAVE_FLOCK
fd = open(filename, O_WRONLY|O_CREAT, 0644);
retval = flock(fd, LOCK_EX|LOCK_NB);
// must leave file-handle open
#else
no file lock mechanism;
#endif
return retval;
}
int FILE_LOCK::unlock(const char* filename) {
#if defined(_WIN32) && !defined(__CYGWIN32__)
if (!CloseHandle(handle)) {
perror("FILE_LOCK::unlock(): close failed.");
}
#else
if (close(fd)) {
perror("FILE_LOCK::unlock(): close failed.");
}
#endif
if (boinc_delete_file(filename) != 0) {
perror("FILE_LOCK::unlock: delete failed.");
}
return 0;
}
void relative_to_absolute(const char* relname, char* path) {
#if defined(_WIN32) && !defined(__CYGWIN32__)
_getcwd(path, 256);
#else
getcwd(path, 256);
#endif
if (strlen(relname)) {
strcat(path, "/");
strcat(path, relname);
}
}
// get total and free space on current filesystem (in bytes)
//
int get_filesystem_info(double &total_space, double &free_space) {
#ifdef _WIN32
FreeFn pGetDiskFreeSpaceEx;
pGetDiskFreeSpaceEx = (FreeFn)GetProcAddress(GetModuleHandle("kernel32.dll"),
"GetDiskFreeSpaceExA");
if (pGetDiskFreeSpaceEx) {
ULARGE_INTEGER TotalNumberOfFreeBytes;
ULARGE_INTEGER TotalNumberOfBytes;
ULARGE_INTEGER TotalNumberOfBytesFreeToCaller;
pGetDiskFreeSpaceEx(NULL, &TotalNumberOfBytesFreeToCaller, &TotalNumberOfBytes, &TotalNumberOfFreeBytes);
signed __int64 uMB;
uMB = TotalNumberOfFreeBytes.QuadPart / (1024 * 1024);
free_space = uMB * 1024.0 * 1024.0;
uMB = TotalNumberOfBytes.QuadPart / (1024 * 1024);
total_space = uMB * 1024.0 * 1024.0;
} else {
DWORD dwSectPerClust;
DWORD dwBytesPerSect;
DWORD dwFreeClusters;
DWORD dwTotalClusters;
GetDiskFreeSpace(NULL, &dwSectPerClust, &dwBytesPerSect, &dwFreeClusters, &dwTotalClusters);
free_space = (double)dwFreeClusters * dwSectPerClust * dwBytesPerSect;
total_space = (double)dwTotalClusters * dwSectPerClust * dwBytesPerSect;
}
#else
#ifdef STATFS
struct STATFS fs_info;
STATFS(".", &fs_info);
#ifdef HAVE_SYS_STATVFS_H
total_space = (double)fs_info.f_frsize * (double)fs_info.f_blocks;
free_space = (double)fs_info.f_frsize * (double)fs_info.f_bavail;
#else
total_space = (double)fs_info.f_bsize * (double)fs_info.f_blocks;
free_space = (double)fs_info.f_bsize * (double)fs_info.f_bavail;
#endif
#else
#error Need to specify a method to obtain free/total disk space
#endif
#endif
return 0;
}
#ifndef _WIN32
int get_file_dir(char* filename, char* dir) {
char buf[8192], *p, path[256];
struct stat sbuf;
int retval;
p = getenv("PATH");
if (!p) return ERR_NOT_FOUND;
strcpy(buf, p);
p = strtok(buf, ":");
while (p) {
sprintf(path, "%s/%s", p, filename);
retval = stat(path, &sbuf);
if (!retval && (sbuf.st_mode & 0111)) {
strcpy(dir, p);
return 0;
}
p = strtok(0, ":");
}
return ERR_NOT_FOUND;
}
#endif
const char *BOINC_RCSID_636c8d709b = "$Id$";
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