block.c (b3d6ca770dd916bceaa7a421252734f86dc07e38) block.c (eba25057b9a5e19d10ace2bc7716667a31297169)
1/*
2 * QEMU System Emulator block driver
3 *
4 * Copyright (c) 2003 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights

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404 drv = bdrv_find_protocol(filename);
405 if (drv == NULL) {
406 return -ENOENT;
407 }
408
409 return bdrv_create(drv, filename, options);
410}
411
1/*
2 * QEMU System Emulator block driver
3 *
4 * Copyright (c) 2003 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights

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404 drv = bdrv_find_protocol(filename);
405 if (drv == NULL) {
406 return -ENOENT;
407 }
408
409 return bdrv_create(drv, filename, options);
410}
411
412#ifdef _WIN32
413void get_tmp_filename(char *filename, int size)
412/*
413 * Create a uniquely-named empty temporary file.
414 * Return 0 upon success, otherwise a negative errno value.
415 */
416int get_tmp_filename(char *filename, int size)
414{
417{
418#ifdef _WIN32
415 char temp_dir[MAX_PATH];
419 char temp_dir[MAX_PATH];
416
417 GetTempPath(MAX_PATH, temp_dir);
418 GetTempFileName(temp_dir, "qem", 0, filename);
419}
420 /* GetTempFileName requires that its output buffer (4th param)
421 have length MAX_PATH or greater. */
422 assert(size >= MAX_PATH);
423 return (GetTempPath(MAX_PATH, temp_dir)
424 && GetTempFileName(temp_dir, "qem", 0, filename)
425 ? 0 : -GetLastError());
420#else
426#else
421void get_tmp_filename(char *filename, int size)
422{
423 int fd;
424 const char *tmpdir;
427 int fd;
428 const char *tmpdir;
425 /* XXX: race condition possible */
426 tmpdir = getenv("TMPDIR");
427 if (!tmpdir)
428 tmpdir = "/tmp";
429 tmpdir = getenv("TMPDIR");
430 if (!tmpdir)
431 tmpdir = "/tmp";
429 snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
432 if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) {
433 return -EOVERFLOW;
434 }
430 fd = mkstemp(filename);
435 fd = mkstemp(filename);
431 close(fd);
432}
436 if (fd < 0 || close(fd)) {
437 return -errno;
438 }
439 return 0;
433#endif
440#endif
441}
434
435/*
436 * Detect host devices. By convention, /dev/cdrom[N] is always
437 * recognized as a host CDROM.
438 */
439static BlockDriver *find_hdev_driver(const char *filename)
440{
441 int score_max = 0, score;

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748 }
749 total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK;
750
751 if (bs1->drv && bs1->drv->protocol_name)
752 is_protocol = 1;
753
754 bdrv_delete(bs1);
755
442
443/*
444 * Detect host devices. By convention, /dev/cdrom[N] is always
445 * recognized as a host CDROM.
446 */
447static BlockDriver *find_hdev_driver(const char *filename)
448{
449 int score_max = 0, score;

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756 }
757 total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK;
758
759 if (bs1->drv && bs1->drv->protocol_name)
760 is_protocol = 1;
761
762 bdrv_delete(bs1);
763
756 get_tmp_filename(tmp_filename, sizeof(tmp_filename));
764 ret = get_tmp_filename(tmp_filename, sizeof(tmp_filename));
765 if (ret < 0) {
766 return ret;
767 }
757
758 /* Real path is meaningless for protocols */
759 if (is_protocol)
760 snprintf(backing_filename, sizeof(backing_filename),
761 "%s", filename);
762 else if (!realpath(filename, backing_filename))
763 return -errno;
764

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769 /* Real path is meaningless for protocols */
770 if (is_protocol)
771 snprintf(backing_filename, sizeof(backing_filename),
772 "%s", filename);
773 else if (!realpath(filename, backing_filename))
774 return -errno;
775

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