https://bz.apache.org/bugzilla/show_bug.cgi?id=62277
--- Comment #35 from Rainer Jung <[email protected]> --- And old OpenSolaris code forked e.g. at https://searchcode.com/codesearch/view/5482758/ indicates, that the 32 bit ftok consist of the lower 8 bits of the id, 12 bits from the device id and another 12 bits from the ino. So if the files are on the same file system, the 12 bit device id will not differentiate and we are left with the lower 8 bit from the id and lower 12 bits from the ino. Unfortunately when checking the generated ftok numbers, I get the "shmget: File exists" much more frequent, than I see a real ftok collision! Your collission check does not trigger, but casting the key to an int sometimes shows duplicates, but less frequent than the shmget EEXIST error. I couldn't find anything about shmget() pecularities, but about the ftok() impl on Solaris one can find: ... ftok() returing a non-unique key is happening very frequently in solaris 10 update 10. We have our code working on solaris and other UX OS. We never had this issue even before on solaris. but as soon as we updated to solaris 10 update10 we are seeing this issue. And it happens quite frequently. update 10 seems to make the symptoms worse. ... Regards, Rainer -- You are receiving this mail because: You are the assignee for the bug. --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
