src-test2/sys/modules/sem, branch release/7.2.0_cvs

Copy releng/7.2 to release/7.2.0 for FreeBSD 7.2-RELEASE.

2009-05-01T02:51:58Z

Approved by: re (implicit) This commit was manufactured to restore the state of the 7.2-RELEASE image.

MFC: Rework the lifetime management of the kernel implementation of POSIX

2009-02-17T19:57:52Z

semaphores. Specifically, semaphores are now represented as new file descriptor type that is set to close on exec. This removes the need for all of the manual process reference counting (and fork, exec, and exit event handlers) as the normal file descriptor operations handle all of that for us nicely. It is also suggested as one possible implementation in the spec and at least one other OS (OS X) uses this approach. Refer to the original commit for more details on specific bug fixes, etc. A notable difference in this MFC relative to the original commit to HEAD is that the MAC entry points are unchanged to preserve the ABI for MAC policy modules. fstat() on a POSIX semaphore in 7 uses the mac_check_posix_sem_getvalue() hook to determine access as that is the closest match to stat() of the available hooks. Discussed with: rwatson (MAC bits (or lack thereof))

Introduce MAC Framework and MAC Policy entry points to label and control

2005-05-04T10:39:15Z

access to POSIX Semaphores: mac_init_posix_sem() Initialize label for POSIX semaphore mac_create_posix_sem() Create POSIX semaphore mac_destroy_posix_sem() Destroy POSIX semaphore mac_check_posix_sem_destroy() Check whether semaphore may be destroyed mac_check_posix_sem_getvalue() Check whether semaphore may be queried mac_check_possix_sem_open() Check whether semaphore may be opened mac_check_posix_sem_post() Check whether semaphore may be posted to mac_check_posix_sem_unlink() Check whether semaphore may be unlinked mac_check_posix_sem_wait() Check whether may wait on semaphore Update Biba, MLS, Stub, and Test policies to implement these entry points. For information flow policies, most semaphore operations are effectively read/write. Submitted by: Dandekar Hrishikesh Sponsored by: DARPA, McAfee, SPARTA Obtained from: TrustedBSD Project

Add the rest of the kernel support for the sem_ API in kern/uipc_sem.c.

2002-09-19T00:43:32Z

Option 'P1003_1B_SEMAPHORES' to compile them in, or load the "sem" module to activate them. Have kern/makesyscalls.sh emit an include for sys/_semaphore.h into sysproto.h to pull in the typedef for semid_t. Add the syscalls to the syscall table as module stubs.