2 Bacula® - The Network Backup Solution
4 Copyright (C) 2003-2007 Free Software Foundation Europe e.V.
6 The main author of Bacula is Kern Sibbald, with contributions from
7 many others, a complete list can be found in the file AUTHORS.
8 This program is Free Software; you can redistribute it and/or
9 modify it under the terms of version two of the GNU General Public
10 License as published by the Free Software Foundation and included
13 This program is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
23 Bacula® is a registered trademark of John Walker.
24 The licensor of Bacula is the Free Software Foundation Europe
25 (FSFE), Fiduciary Program, Sumatrastrasse 25, 8006 Zürich,
26 Switzerland, email:ftf@fsfeurope.org.
29 * Bacula low level File I/O routines. This routine simulates
30 * open(), read(), write(), and close(), but using native routines.
31 * I.e. on Windows, we use Windows APIs.
33 * Kern Sibbald, April MMIII
42 bool (*python_set_prog)(JCR *jcr, const char *prog) = NULL;
43 int (*python_open)(BFILE *bfd, const char *fname, int flags, mode_t mode) = NULL;
44 int (*python_close)(BFILE *bfd) = NULL;
45 ssize_t (*python_read)(BFILE *bfd, void *buf, size_t count) = NULL;
46 ssize_t (*python_write)(BFILE *bfd, void *buf, size_t count) = NULL;
49 #include <sys/paths.h>
52 #if !defined(HAVE_FDATASYNC)
57 /* ===============================================================
59 * U N I X AND W I N D O W S
61 * ===============================================================
64 bool is_win32_stream(int stream)
67 case STREAM_WIN32_DATA:
68 case STREAM_WIN32_GZIP_DATA:
69 case STREAM_ENCRYPTED_WIN32_DATA:
70 case STREAM_ENCRYPTED_WIN32_GZIP_DATA:
76 const char *stream_to_ascii(int stream)
81 case STREAM_UNIX_ATTRIBUTES:
82 return _("Unix attributes");
83 case STREAM_FILE_DATA:
84 return _("File data");
85 case STREAM_MD5_DIGEST:
86 return _("MD5 digest");
87 case STREAM_GZIP_DATA:
88 return _("GZIP data");
89 case STREAM_UNIX_ATTRIBUTES_EX:
90 return _("Extended attributes");
91 case STREAM_SPARSE_DATA:
92 return _("Sparse data");
93 case STREAM_SPARSE_GZIP_DATA:
94 return _("GZIP sparse data");
95 case STREAM_PROGRAM_NAMES:
96 return _("Program names");
97 case STREAM_PROGRAM_DATA:
98 return _("Program data");
99 case STREAM_SHA1_DIGEST:
100 return _("SHA1 digest");
101 case STREAM_WIN32_DATA:
102 return _("Win32 data");
103 case STREAM_WIN32_GZIP_DATA:
104 return _("Win32 GZIP data");
105 case STREAM_MACOS_FORK_DATA:
106 return _("MacOS Fork data");
107 case STREAM_HFSPLUS_ATTRIBUTES:
108 return _("HFS+ attribs");
109 case STREAM_UNIX_ATTRIBUTES_ACCESS_ACL:
110 return _("Standard Unix ACL attribs");
111 case STREAM_UNIX_ATTRIBUTES_DEFAULT_ACL:
112 return _("Default Unix ACL attribs");
113 case STREAM_SHA256_DIGEST:
114 return _("SHA256 digest");
115 case STREAM_SHA512_DIGEST:
116 return _("SHA512 digest");
117 case STREAM_SIGNED_DIGEST:
118 return _("Signed digest");
119 case STREAM_ENCRYPTED_FILE_DATA:
120 return _("Encrypted File data");
121 case STREAM_ENCRYPTED_WIN32_DATA:
122 return _("Encrypted Win32 data");
123 case STREAM_ENCRYPTED_SESSION_DATA:
124 return _("Encrypted session data");
125 case STREAM_ENCRYPTED_FILE_GZIP_DATA:
126 return _("Encrypted GZIP data");
127 case STREAM_ENCRYPTED_WIN32_GZIP_DATA:
128 return _("Encrypted Win32 GZIP data");
129 case STREAM_ENCRYPTED_MACOS_FORK_DATA:
130 return _("Encrypted MacOS fork data");
132 sprintf(buf, "%d", stream);
133 return (const char *)buf;
138 void int64_LE2BE(int64_t* pBE, const int64_t v)
140 /* convert little endian to big endian */
141 if (htonl(1) != 1L) { /* no work if on little endian machine */
142 memcpy(pBE, &v, sizeof(int64_t));
145 uint8_t rv[sizeof(int64_t)];
146 uint8_t *pv = (uint8_t *) &v;
148 for (i = 0; i < 8; i++) {
151 memcpy(pBE, &rv, sizeof(int64_t));
156 void int32_LE2BE(int32_t* pBE, const int32_t v)
158 /* convert little endian to big endian */
159 if (htonl(1) != 1L) { /* no work if on little endian machine */
160 memcpy(pBE, &v, sizeof(int32_t));
163 uint8_t rv[sizeof(int32_t)];
164 uint8_t *pv = (uint8_t *) &v;
166 for (i = 0; i < 4; i++) {
169 memcpy(pBE, &rv, sizeof(int32_t));
174 bool processWin32BackupAPIBlock (BFILE *bfd, void *pBuffer, ssize_t dwSize)
176 /* pByte contains the buffer
177 dwSize the len to be processed. function assumes to be
178 called in successive incremental order over the complete
179 BackupRead stream beginning at pos 0 and ending at the end.
182 PROCESS_WIN32_BACKUPAPIBLOCK_CONTEXT* pContext = &(bfd->win32DecompContext);
183 bool bContinue = false;
184 int64_t dwDataOffset = 0;
187 /* Win32 Stream Header size without name of stream.
188 * = sizeof (WIN32_STREAM_ID)- sizeof(WCHAR*);
190 int32_t dwSizeHeader = 20;
193 if (pContext->liNextHeader >= dwSize) {
194 dwDataLen = dwSize-dwDataOffset;
195 bContinue = false; /* 1 iteration is enough */
197 dwDataLen = pContext->liNextHeader-dwDataOffset;
198 bContinue = true; /* multiple iterations may be necessary */
202 /* copy block of real DATA */
203 if (pContext->bIsInData) {
204 if (bwrite(bfd, ((char *)pBuffer)+dwDataOffset, dwDataLen) != (ssize_t)dwDataLen)
208 if (pContext->liNextHeader < dwSize) {/* is a header in this block ? */
209 int32_t dwOffsetTarget;
210 int32_t dwOffsetSource;
212 if (pContext->liNextHeader < 0) {
213 /* start of header was before this block, so we
214 * continue with the part in the current block
216 dwOffsetTarget = -pContext->liNextHeader;
219 /* start of header is inside of this block */
221 dwOffsetSource = pContext->liNextHeader;
224 int32_t dwHeaderPartLen = dwSizeHeader-dwOffsetTarget;
225 bool bHeaderIsComplete;
227 if (dwHeaderPartLen <= dwSize-dwOffsetSource) {
228 /* header (or rest of header) is completely available
231 bHeaderIsComplete = true;
233 /* header will continue in next block */
234 bHeaderIsComplete = false;
235 dwHeaderPartLen = dwSize-dwOffsetSource;
238 /* copy the available portion of header to persistent copy */
239 memcpy(((char *)&pContext->header_stream)+dwOffsetTarget, ((char *)pBuffer)+dwOffsetSource, dwHeaderPartLen);
241 /* recalculate position of next header */
242 if (bHeaderIsComplete) {
243 /* convert stream name size (32 bit little endian) to machine type */
245 int32_LE2BE (&dwNameSize, pContext->header_stream.dwStreamNameSize);
246 dwDataOffset = dwNameSize+pContext->liNextHeader+dwSizeHeader;
248 /* convert stream size (64 bit little endian) to machine type */
249 int64_LE2BE (&(pContext->liNextHeader), pContext->header_stream.Size);
250 pContext->liNextHeader += dwDataOffset;
252 pContext->bIsInData = pContext->header_stream.dwStreamId == WIN32_BACKUP_DATA;
253 if (dwDataOffset == dwSize)
256 /* stop and continue with next block */
258 pContext->bIsInData = false;
263 /* set "NextHeader" relative to the beginning of the next block */
264 pContext->liNextHeader-= dwSize;
271 /* ===============================================================
275 * ===============================================================
278 #if defined(HAVE_WIN32)
280 void unix_name_to_win32(POOLMEM **win32_name, char *name);
281 extern "C" HANDLE get_osfhandle(int fd);
284 void binit(BFILE *bfd)
286 memset(bfd, 0, sizeof(BFILE));
288 bfd->mode = BF_CLOSED;
289 bfd->use_backup_api = have_win32_api();
293 * Enables using the Backup API (win32_data).
294 * Returns 1 if function worked
295 * Returns 0 if failed (i.e. do not have Backup API on this machine)
297 bool set_win32_backup(BFILE *bfd)
299 /* We enable if possible here */
300 bfd->use_backup_api = have_win32_api();
301 return bfd->use_backup_api;
305 bool set_portable_backup(BFILE *bfd)
307 bfd->use_backup_api = false;
311 bool set_prog(BFILE *bfd, char *prog, JCR *jcr)
319 * Return 1 if we are NOT using Win32 BackupWrite()
322 bool is_portable_backup(BFILE *bfd)
324 return !bfd->use_backup_api;
327 bool have_win32_api()
329 return p_BackupRead && p_BackupWrite;
334 * Return true if we support the stream
335 * false if we do not support the stream
337 * This code is running under Win32, so we
338 * do not need #ifdef on MACOS ...
340 bool is_restore_stream_supported(int stream)
344 /* Streams known not to be supported */
346 case STREAM_GZIP_DATA:
347 case STREAM_SPARSE_GZIP_DATA:
348 case STREAM_WIN32_GZIP_DATA:
350 case STREAM_MACOS_FORK_DATA:
351 case STREAM_HFSPLUS_ATTRIBUTES:
352 case STREAM_ENCRYPTED_MACOS_FORK_DATA:
357 case STREAM_GZIP_DATA:
358 case STREAM_SPARSE_GZIP_DATA:
359 case STREAM_WIN32_GZIP_DATA:
361 case STREAM_WIN32_DATA:
362 case STREAM_UNIX_ATTRIBUTES:
363 case STREAM_FILE_DATA:
364 case STREAM_MD5_DIGEST:
365 case STREAM_UNIX_ATTRIBUTES_EX:
366 case STREAM_SPARSE_DATA:
367 case STREAM_PROGRAM_NAMES:
368 case STREAM_PROGRAM_DATA:
369 case STREAM_SHA1_DIGEST:
371 case STREAM_SHA256_DIGEST:
372 case STREAM_SHA512_DIGEST:
375 case STREAM_SIGNED_DIGEST:
376 case STREAM_ENCRYPTED_FILE_DATA:
377 case STREAM_ENCRYPTED_FILE_GZIP_DATA:
378 case STREAM_ENCRYPTED_WIN32_DATA:
379 case STREAM_ENCRYPTED_WIN32_GZIP_DATA:
381 case 0: /* compatibility with old tapes */
387 HANDLE bget_handle(BFILE *bfd)
392 int bopen(BFILE *bfd, const char *fname, int flags, mode_t mode)
394 POOLMEM *win32_fname;
395 POOLMEM *win32_fname_wchar;
397 DWORD dwaccess, dwflags, dwshare;
399 /* Convert to Windows path format */
400 win32_fname = get_pool_memory(PM_FNAME);
401 win32_fname_wchar = get_pool_memory(PM_FNAME);
403 unix_name_to_win32(&win32_fname, (char *)fname);
405 if (!(p_CreateFileA || p_CreateFileW))
408 if (p_CreateFileW && p_MultiByteToWideChar)
409 make_win32_path_UTF8_2_wchar(&win32_fname_wchar, fname);
411 if (flags & O_CREAT) { /* Create */
412 if (bfd->use_backup_api) {
413 dwaccess = GENERIC_WRITE|FILE_ALL_ACCESS|WRITE_OWNER|WRITE_DAC|ACCESS_SYSTEM_SECURITY;
414 dwflags = FILE_FLAG_BACKUP_SEMANTICS;
416 dwaccess = GENERIC_WRITE;
420 if (p_CreateFileW && p_MultiByteToWideChar) {
421 // unicode open for create write
422 bfd->fh = p_CreateFileW((LPCWSTR)win32_fname_wchar,
423 dwaccess, /* Requested access */
425 NULL, /* SecurityAttributes */
426 CREATE_ALWAYS, /* CreationDisposition */
427 dwflags, /* Flags and attributes */
428 NULL); /* TemplateFile */
431 bfd->fh = p_CreateFileA(win32_fname,
432 dwaccess, /* Requested access */
434 NULL, /* SecurityAttributes */
435 CREATE_ALWAYS, /* CreationDisposition */
436 dwflags, /* Flags and attributes */
437 NULL); /* TemplateFile */
440 bfd->mode = BF_WRITE;
442 } else if (flags & O_WRONLY) { /* Open existing for write */
443 if (bfd->use_backup_api) {
444 dwaccess = GENERIC_WRITE|WRITE_OWNER|WRITE_DAC;
445 dwflags = FILE_FLAG_BACKUP_SEMANTICS;
447 dwaccess = GENERIC_WRITE;
451 if (p_CreateFileW && p_MultiByteToWideChar) {
452 // unicode open for open existing write
453 bfd->fh = p_CreateFileW((LPCWSTR)win32_fname_wchar,
454 dwaccess, /* Requested access */
456 NULL, /* SecurityAttributes */
457 OPEN_EXISTING, /* CreationDisposition */
458 dwflags, /* Flags and attributes */
459 NULL); /* TemplateFile */
462 bfd->fh = p_CreateFileA(win32_fname,
463 dwaccess, /* Requested access */
465 NULL, /* SecurityAttributes */
466 OPEN_EXISTING, /* CreationDisposition */
467 dwflags, /* Flags and attributes */
468 NULL); /* TemplateFile */
472 bfd->mode = BF_WRITE;
475 if (bfd->use_backup_api) {
476 dwaccess = GENERIC_READ|READ_CONTROL|ACCESS_SYSTEM_SECURITY;
477 dwflags = FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_SEQUENTIAL_SCAN |
478 FILE_FLAG_OPEN_REPARSE_POINT;
479 dwshare = FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE;
481 dwaccess = GENERIC_READ;
483 dwshare = FILE_SHARE_READ|FILE_SHARE_WRITE;
486 if (p_CreateFileW && p_MultiByteToWideChar) {
487 // unicode open for open existing read
488 bfd->fh = p_CreateFileW((LPCWSTR)win32_fname_wchar,
489 dwaccess, /* Requested access */
490 dwshare, /* Share modes */
491 NULL, /* SecurityAttributes */
492 OPEN_EXISTING, /* CreationDisposition */
493 dwflags, /* Flags and attributes */
494 NULL); /* TemplateFile */
497 bfd->fh = p_CreateFileA(win32_fname,
498 dwaccess, /* Requested access */
499 dwshare, /* Share modes */
500 NULL, /* SecurityAttributes */
501 OPEN_EXISTING, /* CreationDisposition */
502 dwflags, /* Flags and attributes */
503 NULL); /* TemplateFile */
509 if (bfd->fh == INVALID_HANDLE_VALUE) {
510 bfd->lerror = GetLastError();
511 bfd->berrno = b_errno_win32;
512 errno = b_errno_win32;
513 bfd->mode = BF_CLOSED;
516 bfd->lpContext = NULL;
517 bfd->win32DecompContext.bIsInData = false;
518 bfd->win32DecompContext.liNextHeader = 0;
519 free_pool_memory(win32_fname_wchar);
520 free_pool_memory(win32_fname);
521 return bfd->mode == BF_CLOSED ? -1 : 1;
525 * Returns 0 on success
528 int bclose(BFILE *bfd)
533 free_pool_memory(bfd->errmsg);
536 if (bfd->mode == BF_CLOSED) {
539 if (bfd->use_backup_api && bfd->mode == BF_READ) {
541 if (!bfd->lpContext && !p_BackupRead(bfd->fh,
543 (DWORD)0, /* bytes to read */
544 &bfd->rw_bytes, /* bytes read */
546 1, /* ProcessSecurity */
547 &bfd->lpContext)) { /* Read context */
548 errno = b_errno_win32;
551 } else if (bfd->use_backup_api && bfd->mode == BF_WRITE) {
553 if (!bfd->lpContext && !p_BackupWrite(bfd->fh,
555 (DWORD)0, /* bytes to read */
556 &bfd->rw_bytes, /* bytes written */
558 1, /* ProcessSecurity */
559 &bfd->lpContext)) { /* Write context */
560 errno = b_errno_win32;
564 if (!CloseHandle(bfd->fh)) {
566 errno = b_errno_win32;
568 bfd->mode = BF_CLOSED;
569 bfd->lpContext = NULL;
573 /* Returns: bytes read on success
577 ssize_t bread(BFILE *bfd, void *buf, size_t count)
581 if (bfd->use_backup_api) {
582 if (!p_BackupRead(bfd->fh,
587 1, /* Process Security */
588 &bfd->lpContext)) { /* Context */
589 bfd->lerror = GetLastError();
590 bfd->berrno = b_errno_win32;
591 errno = b_errno_win32;
595 if (!ReadFile(bfd->fh,
600 bfd->lerror = GetLastError();
601 bfd->berrno = b_errno_win32;
602 errno = b_errno_win32;
607 return (ssize_t)bfd->rw_bytes;
610 ssize_t bwrite(BFILE *bfd, void *buf, size_t count)
614 if (bfd->use_backup_api) {
615 if (!p_BackupWrite(bfd->fh,
620 1, /* Process Security */
621 &bfd->lpContext)) { /* Context */
622 bfd->lerror = GetLastError();
623 bfd->berrno = b_errno_win32;
624 errno = b_errno_win32;
628 if (!WriteFile(bfd->fh,
633 bfd->lerror = GetLastError();
634 bfd->berrno = b_errno_win32;
635 errno = b_errno_win32;
639 return (ssize_t)bfd->rw_bytes;
642 bool is_bopen(BFILE *bfd)
644 return bfd->mode != BF_CLOSED;
647 boffset_t blseek(BFILE *bfd, boffset_t offset, int whence)
649 LONG offset_low = (LONG)offset;
650 LONG offset_high = (LONG)(offset >> 32);
653 dwResult = SetFilePointer(bfd->fh, offset_low, &offset_high, whence);
655 if (dwResult == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
656 return (boffset_t)-1;
659 return ((boffset_t)offset_high << 32) | dwResult;
662 #else /* Unix systems */
664 /* ===============================================================
668 * ===============================================================
670 void binit(BFILE *bfd)
672 memset(bfd, 0, sizeof(BFILE));
676 bool have_win32_api()
678 return false; /* no can do */
682 * Enables using the Backup API (win32_data).
683 * Returns true if function worked
684 * Returns false if failed (i.e. do not have Backup API on this machine)
686 bool set_win32_backup(BFILE *bfd)
688 return false; /* no can do */
692 bool set_portable_backup(BFILE *bfd)
694 return true; /* no problem */
698 * Return true if we are writing in portable format
699 * return false if not
701 bool is_portable_backup(BFILE *bfd)
703 return true; /* portable by definition */
706 bool set_prog(BFILE *bfd, char *prog, JCR *jcr)
709 if (bfd->prog && strcmp(prog, bfd->prog) == 0) {
710 return true; /* already setup */
713 if (python_set_prog(jcr, prog)) {
714 Dmsg1(000, "Set prog=%s\n", prog);
720 Dmsg0(000, "No prog set\n");
727 * This code is running on a non-Win32 machine
729 bool is_restore_stream_supported(int stream)
731 /* No Win32 backup on this machine */
734 case STREAM_GZIP_DATA:
735 case STREAM_SPARSE_GZIP_DATA:
736 case STREAM_WIN32_GZIP_DATA:
738 #ifndef HAVE_DARWIN_OS
739 case STREAM_MACOS_FORK_DATA:
740 case STREAM_HFSPLUS_ATTRIBUTES:
746 case STREAM_GZIP_DATA:
747 case STREAM_SPARSE_GZIP_DATA:
748 case STREAM_WIN32_GZIP_DATA:
750 case STREAM_WIN32_DATA:
751 case STREAM_UNIX_ATTRIBUTES:
752 case STREAM_FILE_DATA:
753 case STREAM_MD5_DIGEST:
754 case STREAM_UNIX_ATTRIBUTES_EX:
755 case STREAM_SPARSE_DATA:
756 case STREAM_PROGRAM_NAMES:
757 case STREAM_PROGRAM_DATA:
758 case STREAM_SHA1_DIGEST:
760 case STREAM_SHA256_DIGEST:
761 case STREAM_SHA512_DIGEST:
764 case STREAM_SIGNED_DIGEST:
765 case STREAM_ENCRYPTED_FILE_DATA:
766 case STREAM_ENCRYPTED_FILE_GZIP_DATA:
767 case STREAM_ENCRYPTED_WIN32_DATA:
768 case STREAM_ENCRYPTED_WIN32_GZIP_DATA:
770 #ifdef HAVE_DARWIN_OS
771 case STREAM_MACOS_FORK_DATA:
772 case STREAM_HFSPLUS_ATTRIBUTES:
774 case STREAM_ENCRYPTED_MACOS_FORK_DATA:
775 #endif /* HAVE_CRYPTO */
776 #endif /* HAVE_DARWIN_OS */
777 case 0: /* compatibility with old tapes */
784 int bopen(BFILE *bfd, const char *fname, int flags, mode_t mode)
786 /* Open reader/writer program */
788 Dmsg1(000, "Open file %d\n", bfd->fid);
789 return python_open(bfd, fname, flags, mode);
792 /* Normal file open */
793 Dmsg1(400, "open file %s\n", fname);
794 /* We use fnctl to set O_NOATIME if requested to avoid open error */
795 bfd->fid = open(fname, flags & ~O_NOATIME, mode);
796 /* Set O_NOATIME if possible */
797 if (bfd->fid != -1 && flags & O_NOATIME) {
798 int oldflags = fcntl(bfd->fid, F_GETFL, 0);
799 if (oldflags == -1) {
804 int ret = fcntl(bfd->fid, F_SETFL, oldflags | O_NOATIME);
805 /* EPERM means setting O_NOATIME was not allowed */
806 if (ret == -1 && errno != EPERM) {
814 bfd->m_flags = flags;
815 Dmsg1(400, "Open file %d\n", bfd->fid);
818 bfd->win32DecompContext.bIsInData = false;
819 bfd->win32DecompContext.liNextHeader = 0;
821 #if defined(HAVE_POSIX_FADVISE) && defined(POSIX_FADV_WILLNEED)
822 if (bfd->fid != -1 && flags & O_RDONLY) {
823 int stat = posix_fadvise(bfd->fid, 0, 0, POSIX_FADV_WILLNEED);
824 Dmsg2(400, "Did posix_fadvise on %s stat=%d\n", fname, stat);
831 #ifdef HAVE_DARWIN_OS
832 /* Open the resource fork of a file. */
833 int bopen_rsrc(BFILE *bfd, const char *fname, int flags, mode_t mode)
837 rsrc_fname = get_pool_memory(PM_FNAME);
838 pm_strcpy(rsrc_fname, fname);
839 pm_strcat(rsrc_fname, _PATH_RSRCFORKSPEC);
840 bopen(bfd, rsrc_fname, flags, mode);
841 free_pool_memory(rsrc_fname);
847 int bclose(BFILE *bfd)
851 Dmsg1(400, "Close file %d\n", bfd->fid);
853 /* Close reader/writer program */
855 return python_close(bfd);
858 if (bfd->fid == -1) {
861 #if defined(HAVE_POSIX_FADVISE) && defined(POSIX_FADV_DONTNEED)
862 if (bfd->m_flags & O_RDONLY) {
863 fdatasync(bfd->fid); /* sync the file */
864 /* Tell OS we don't need it any more */
865 posix_fadvise(bfd->fid, 0, 0, POSIX_FADV_DONTNEED);
869 /* Close normal file */
870 stat = close(bfd->fid);
876 ssize_t bread(BFILE *bfd, void *buf, size_t count)
881 return python_read(bfd, buf, count);
883 stat = read(bfd->fid, buf, count);
888 ssize_t bwrite(BFILE *bfd, void *buf, size_t count)
893 return python_write(bfd, buf, count);
895 stat = write(bfd->fid, buf, count);
900 bool is_bopen(BFILE *bfd)
902 return bfd->fid >= 0;
905 boffset_t blseek(BFILE *bfd, boffset_t offset, int whence)
908 pos = (boffset_t)lseek(bfd->fid, (off_t)offset, whence);