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Lock opened disk image files with O_EXLOCK (same as flock()) on

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Mac OS X to prevent concurrent access from the Finder.
This commit is contained in:
Alexei Svitkine 2012-06-25 12:56:58 -04:00
parent ac0b8e0240
commit 58f4fa8425
1 changed files with 19 additions and 3 deletions
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22
BasiliskII/src/Unix/sys_unix.cpp
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@ -616,10 +616,26 @@ void *Sys_open(const char *name, bool read_only)
}
#endif
int open_flags = (read_only ? O_RDONLY : O_RDWR);
#if defined(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__MACOSX__)
int fd = open(name, (read_only ? O_RDONLY : O_RDWR) | (is_cdrom ? O_NONBLOCK : 0));
#else
int fd = open(name, read_only ? O_RDONLY : O_RDWR);
open_flags |= (is_cdrom ? O_NONBLOCK : 0);
#endif
#if defined(__MACOSX__)
open_flags |= (is_file ? O_EXLOCK | O_NONBLOCK : 0);
#endif
int fd = open(name, open_flags);
#if defined(__MACOSX__)
if (fd < 0 && (open_flags & O_EXLOCK)) {
if (errno == EOPNOTSUPP) {
// File system does not support locking. Try again without.
open_flags &= ~O_EXLOCK;
fd = open(name, open_flags);
} else if (errno == EAGAIN) {
// File is likely already locked by another process.
printf("WARNING: Cannot open %s (%s)\n", name, strerror(errno));
return NULL;
}
}
#endif
if (fd < 0 && !read_only) {
// Read-write failed, try read-only