POSIX.1, POSIX.1b and POSIX.1c Function Calls

A Real-Time Embedded Development Reference Guide

All function calls for POSIX®.1, POSIX.1b and POSIX.1c are fully supported by the LynxOS® real-time operating system.

POSIX.1 function calls
Function POSIX Description
access Tests for file accessibility
alarm Schedules an alarm
asctime Converts a time structure to a string
cfgetispeed Reads terminal input baud rate
cfgetospeed Reads terminal output baud rate
cfsetispeed Sets terminal input baud rate
cfsetospeed Sets terminal output baud rate
chdir Changes current working directory
chmod Changes file mode
chown Changes owner and/or group of a file
close Closes a file
closedir Ends directory read operation
creat Creates a new file or rewrites an existing one
ctermid Generates terminal pathname
cuserid Gets user name
dup Duplicates an open file descriptor
dup2 Duplicates an open file descriptor
execl Executes a file
execle Executes a file
execlp Executes a file
execv Executes a file
execve Executes a file
execvp Executes a file
_exit Terminates a process
fcntl Manipulates an open file descriptor
fdopen Opens a stream on a file descriptor
fork Creates a process
fpathconf Gets configuration variable for an open file
fstat Gets file status
getcwd Gets current working directory
getegid Gets effective group ID
getenv Gets environment variable
geteuid Gets effective user ID
getgid Gets real group ID
getgrgid Reads groups database based on group ID
getgrnam Reads groups database based on group name
getgroups Gets supplementary group IDs
getlogin Gets user name
getpgrp Gets process group ID
getpid Gets process ID
getppid Gets parent process ID
getpwnam Reads user database based on user name
getpwuid Reads user database based on user ID
getuid Gets real user ID
isatty Determines if a file descriptor is associated with a terminal
kill Sends a kill signal to a process
link Creates a link to a file
longjmp Restores the calling environment
lseek Repositions read/write file offset
mkdir Makes a directory
mkfifo Makes a FIFO special file
open Opens a file
opendir Opens a directory
pathconf Gets configuration variables for a path
pause Suspends a process execution
pipe Creates an interprocess channel
read Reads from a file
readdir Reads a directory
rename Renames a file
rewinddir Resets the readdir() pointer
rmdir Removes a directory
setgid Sets group ID
setjmp Saves the calling environment for use by longjmp()
setlocale Sets or queries a program’s locale
setpgid Sets a process group ID for job control
setuid Sets the user ID
sigaction Examines and changes signal action
sigaddset Adds a signal to a signal set
sigdelset Removes a signal to a signal set
sigemptyset Creates an empty signal set
sigfillset Creates a full set of signals
sigismember Tests a signal for a selected member
siglongjmp Goes to and restores signal mask
sigpending Examines pending signals
sigprocmask Examines and changes blocked signals
sigsetjmp Saves state for siglongjmp()
sigsuspend Waits for a signal
sleep Delays process execution
stat Gets information about a file
sysconf Gets system configuration information
tcdrain Waits for all output to be transmitted to the terminal
tcflow Suspends/restarts terminal output
tcflush Discards terminal data
tcgetattr Gets terminal attributes
tcgetpgrp Gets foreground process group ID
tcsendbreak Sends a break to a terminal
tcsetattr Sets terminal attributes
tcsetpgrp Sets foreground process group ID
time Determines the current calendar time
times Gets process times
ttyname Determines a terminal pathname
tzset Sets the timezone from environment variables
umask Sets the file creation mask
uname Gets system name
unlink Removes a directory entry
utime Sets file access and modification times
waitpid Waits for process termination
write Writes to a file

 

POSIX.1b function calls
Function POSIX Description
aio_cancel Tries to cancel an asynchronous operation
aio_error Retrieves the error status for an asynchronous operation
aio_read Asynchronously reads from a file
aio_return Retrieves the return status for an asynchronous operation
aio_suspend Waits for an asynchronous operation to complete
aio_write Asynchronously writes to a file
clock_getres Gets resolution of a POSIX.1b clock
clock_gettime Gets the time according to a particular POSIX.1b clock
clock_settime Sets the time according to a particular POSIX.1b clock
fdatasync Synchronizes at least the data part of a file with the underlying media
fsync Synchronizes a file with the underlying media
kill, sigqueue Sends signals to a process
lio_listio Performs a list of I/O operations, synchronously or asynchronously
mlock Locks a range of memory
mlockall Locks the entire memory space down
mmap Maps a shared memory object (or possibly another file) into process’s address space
mprotect Changes memory protection on a mapped area
mq_close Terminates access to a POSIX.1b message queue
mq_getattr Gets POSIX.1b message queue attributes
mq_notify Registers a request to be notified when a message arrives on an empty message queue
mq_open Creates/accesses a POSIX.1b message queue
mq_receive Receives a message from a POSIX.1b message queue
mq_send Sends a message on a POSIX.1b message queue
mq_setattr Sets a subset of POSIX.1b message queue attributes
msync Makes a mapping consistent with the underlying object
munlock Unlocks a range of memory
munlockall Unlocks the entire address space
munmap Undo mapping established by mmap
nanosleep Pauses execution for a number of nanoseconds
sched_get_priority_max Gets maximum priority value for a scheduler
sched_get_priority_min Gets minimum priority value for a scheduler
sched_getparam Retrieves scheduling parameters for a particular process
sched_getscheduler Retrieves scheduling algorithm for a particular purpose
sched_rr_get_interval Gets the SCHED_RR interval for the named process
sched_setparam Sets scheduling parameters for a process
sched_setscheduler Sets scheduling algorithm/parameters for a process
sched_yield Yields the processor
sem_close Terminates access to a POSIX.1b semaphore
sem_destroy De-initializes a POSIX.1b unnamed semaphore
sem_getvalue Gets the value of a POSIX.1b semaphore
sem_open Creates/accesses a POSIX.1b named semaphore
sem_post Posts (signal) a POSIX.1b named or unnamed semaphore
sem_unlink Destroys a POSIX.1b named semaphore
sem_wait, sem_trywait Waits on a POSIX.1b named or unnamed semaphore
shm_open Creates/accesses a POSIX.1b shared memory object
shm_unlink Destroys a POSIX.1b shared memory object
sigwaitinfosigtimedwait Synchronously awaits signal arrival; avoid calling handler
timer_create Creates a POSIX.1b timer based on a particular clock
timer_delete Deletes a POSIX.1b timer
timer_gettime Time remaining on a POSIX.1b timer before expiration
timer_settime Sets expiration time/interval for a POSIX.1b timer
wait, waitpid Retrieves status of a terminated process and clean up corpse

 

POSIX.1c function calls
Function POSIX Description
pthread_atfork Declares procedures to be called before and after a fork
pthread_attr_destroy Destroys a thread attribute object
pthread_attr_getdetachstate Obtains the setting of the detached state of a thread
pthread_attr_getinheritsched Obtains the setting of the scheduling inheritance of a thread
pthread_attr_getschedparam Obtains the parameters associated with the scheduling policy attribute of a thread
pthread_attr_getschedpolicy Obtains the setting of the scheduling policy of a thread
pthread_attr_getscope Obtains the setting of the scheduling scope of a thread
pthread_attr_getstackaddr Obtains the stack address of a thread
pthread_attr_getstacksize Obtains the stack size of a thread
pthread_attr_init Initializes a thread attribute object
pthread_attr_setdetachstate Adjusts the detached state of a thread
pthread_attr_setinheritsched Adjusts the scheduling inheritance of a thread
pthread_attr_setschedparam Adjusts the parameters associated with the scheduling policy of a thread
pthread_attr_setschedpolicy Adjusts the scheduling policy of a thread
pthread_attr_setscope Adjusts the scheduling scope of a thread
pthread_attr_setstackaddr Adjusts the stack address of a thread
pthread_attr_setstacksize Adjusts the stack size of a thread
pthread_cancel Cancels the specific thread
pthread_cleanup_pop Removes the routine from the top of a thread’s cleanup stack, and if execute is nonzero, runs it
pthread_cleanup_push Places a routine on the top of a thread’s cleanup stack
pthread_condattr_destroy Destroys a condition variable attribute object
pthread_condattr_getpshared Obtains the process-shared setting of a condition variable attribute object
pthread_condattr_init Initializes a condition variable attribute object
pthread_condattr_setpshared Sets the process-shared attribute in a condition variable attribute object to either <span
style=’font-size:7.0pt;font-family:”Times New Roman”‘>PTHREAD_PROCESS_SHARED or PTHREAD_PROCESS_PRIVATE
pthread_cond_broadcast Unblocks all threads that are waiting on a condition variable
pthread_cond_destroy Destroys a condition variable
pthread_cond_init Initializes a condition variable with the attributes specified in the specified condition variable
attribute object
pthread_cond_signal Unblocks at least one thread waiting on a condition variable
pthread_cond_timedwait Automatically unlocks the specified mutex, and places the calling thread into a wait state
pthread_cond_wait Automatically unlocks the specified mutex, and places the calling thread into a wait state
pthread_create Creates a thread with the attributes specified in attr
pthread_detach Marks a threads internal data structures for deletion
pthread_equal Compares one thread handle to another thread handle
pthread_exit Terminates the calling thread
pthread_getschedparam Obtains both scheduling policy and scheduling parameters of an existing thread
pthread_getspecific Obtains the thread specific data value associated with the specific key in the calling thread
pthread_join Causes the calling thread to wait for the specific thread’s termination
pthread_key_create Generates a unique thread-specific key that’s visible to all threads in a process
pthread_key_delete Deletes a thread specific key
pthread_kill Delivers a signal to the specified thread
pthread_mutexattr_destroy Destroys a mutex attribute object
pthread_mutexattr_getprioceiling Obtains the priority ceiling of a mutex attribute object
pthread_mutexattr_getprotocol Obtains protocol of a mutex attribute object
pthread_mutexattr_getpshared Obtains a process-shared setting of a mutex attribute object
pthread_mutexattr_init Initializes a mutex attribute object
pthread_mutexattr_setprioceiling Sets the priority ceiling attribute of a mutex attribute object
pthread_mutexattr_setprotocol Sets the protocol attribute of a mutex attribute object
pthread_mutexattr_setpshared Sets the process-shared attribute of a mutex attribute object to either <span
class=computertext>PTHREAD_PROCESS_SHARED
or PTHREAD_PROCESS_PRIVATE
pthread_mutex_destroy Destroys a mutex
pthread_mutex_init Initializes a mutex with the attributes specified in the specified mutex attribute object
pthread_mutex_lock Locks an unlocked mutex
pthread_mutex_trylock Tries to lock a <span
class=computertext>not tested
pthread_mutex_unlock Unlocks a mutex
pthread_once Ensures that <span
class=computertext>init_routine
will run just once regardless of how many threads in the process call it
pthread_self Obtains a thread handle of a calling thread
pthread_setcancelstate Sets a thread’s cancelability state
pthread_setcanceltype Sets a thread’s cancelability type
pthread_setschedparam Adjusts the scheduling policy and scheduling parameters of an existing thread
pthread_setspecific Sets the thread-specific data value associated with the specific key in the calling thread
pthread_sigmask Examines or changes the calling thread’s signal mask
pthread_testcancel Requests that any pending cancellation request be delivered to the calling thread