The UNIX Portability initative will continue to add APIs, tools and utilities into future releases of OpenVMS with the goal of
achieving industry standard compliance. Enhancements are planned for the following areas:
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Symbolic links support (soft links)
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New APIs
lchown — change the owner and group of a symbolic link
lstat — get symbolic link status
readlink — read the contents of a symbolic link
symlink and support for symbolic links in other functions, such as rename
unlink — remove a directory entry
Existing APIs (for example open, stat) will be modified to accommodate symbolic links.
Applications such as NFS will be enhanced to support symbolic links.
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Async I/O interfaces |
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aio_cancel — cancel an asynchronous I/O request
aio_error — retrieve errors status for an asynch I/O operation
aio_fsync — asynchronous file synchronization
aio_read — asynchronous read from a file
aio_return — retrieve return status of an asynch I/O operation
aio_suspend — wait for an asynchronous I/O request
aio_write — asynchronous write to a file
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Resource management |
getrlimit — get maximum resource
settings
setrlimit — set maximum resource consumption
getrusage — get information about resource utilization |
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Locking functions |
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flockfile — standard I/O locking
function
ftrylockfile — standard I/O locking function
funlockfile — standard I/O locking function
ockf — record locking on files |
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Semaphore functions |
sem_destroy — destroy an unnamed
semaphore
sem_init — initialise an unnamed semaphore
sem_post — unlock a semaphore
sem_wait, sem_trywait — lock a semaphore
sem_timedwait — lock a semaphore
semctl — semaphore control operations
semget — get set of semaphores
semop — semaphore operations |
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Messaging functions |
msgctl — message control operations
msgget — get the message queue identifier
msgrcv — message receive operation
msgsnd — message send operation |
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Scheduling functions |
sched_get_priority_max|min — get priority limits(REALTIME)
sched_getparam — get scheduling parameters
sched_getscheduler — get scheduling policy
sched_rr_get_interval — get execution time limits
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TCP |
socketpair — create a pair of
connected sockets
ioctl — control a STREAMS device |
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File Characteristics |
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fallocate — get file allocation information
fstatvfs — get file system information
statvfs — get file system information
ulimit — set or report file size limit |
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Miscellaneous |
crypt — string encoding function(CRYPT)
io_listio — list directed I/O (REALTIME)
realpath — resolve a pathname (into an absolute path) |
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GNV |
UNIX98 compliance
Improved make and configure routines
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In future releases of OpenVMS, the C RTL and the Base Operating system will support major UNIX functions like fork, a
fork-safe I/O, and semaphore functions.
