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|ID||Category||Severity||Type||Date Submitted||Last Update|
|0001118||[1003.1(2016)/Issue7+TC2] Base Definitions and Headers||Comment||Clarification Requested||2017-01-20 13:05||2017-01-20 14:36|
|Section||fork, fcntl, flockfile|
|Final Accepted Text|
|Summary||0001118: Clarify meaning of "file lock"|
In http://pubs.opengroup.org/onlinepubs/9699919799/ [^] (fork) it states that "File locks set by the parent process shall not be inherited by the child process.".
As far as I can tell, the phrase 'file lock', is not explicitly defined and there are at least two types of lock which could be described as a 'file lock'. One is the type of lock established by fcntl(), which states in its rationale that locks are not inherited through fork(). The other is a lock established by flockfile() which makes no mention of fork().
Furthermore, in this context, the term 'inherited' could be taken to mean that the lock's data structures are copied to the child or that the ownership of the lock is inherited by the child (i.e. the child can access a file locked by the parent) or that the child is subject to restrictions imposed by the locks (i.e. it can't access a locked file).
This may or may not be related to: http://austingroupbugs.net/view.php?id=1112 [^]
1. Explicitly state the types of lock meant by 'file lock'
2. Elaborate on the term 'inherit' in the context of file locks during a process fork or cite its definition.
|Tags||No tags attached.|
This issue is an active source of confusion as a fork() test within the LTP/Open POSIX test suite has used one interpretation and glibc has used another. The test passes on older versions of glibc, but has now begun to fail.
Related discussion: https://bugzilla.novell.com/show_bug.cgi?id=1018908 [^]
|2017-01-20 13:05||rpalethorpe||New Issue|
|2017-01-20 13:05||rpalethorpe||Name||=> Richard Palethorpe|
|2017-01-20 13:05||rpalethorpe||Organization||=> SUSE|
|2017-01-20 13:05||rpalethorpe||Section||=> fork, fcntl, flockfile|
|2017-01-20 13:05||rpalethorpe||Page Number||=> fork|
|2017-01-20 13:05||rpalethorpe||Line Number||=> 20ish|
|2017-01-20 14:36||rpalethorpe||Note Added: 0003558|
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