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* mmap.cc (mmap): Outflank copy-on-write problem on 9x by

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setting access mode to FILE_MAP_READ when read access is requested.
This commit is contained in:
Corinna Vinschen
2001-03-26 18:17:15 +00:00
parent aa73152ef7
commit 1636a5a1e8
2 changed files with 10 additions and 1 deletions
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5
winsup/cygwin/mmap.cc
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@ -380,7 +380,10 @@ mmap (caddr_t addr, size_t len, int prot, int flags, int fd, off_t off)
}
DWORD access = (prot & PROT_WRITE) ? FILE_MAP_WRITE : FILE_MAP_READ;
if (flags & MAP_PRIVATE)
/* copy-on-write doesn't work correctly on 9x. To have at least read
access we use *READ mapping on 9x when appropriate. It will still
fail when needing write access, though. */
if ((flags & MAP_PRIVATE) && (os_being_run == winNT || !(prot & PROT_READ)))
access = FILE_MAP_COPY;
SetResourceLock(LOCK_MMAP_LIST,READ_LOCK|WRITE_LOCK," mmap");