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Linux Documentation > Manual Pages > POSIX Functions _longjmp, _setjmp - non-local goto _tolower - transliterate uppercase characters to lowercase _toupper - transliterate lowercase characters to uppercase a64l, l64a - convert between a 32-bit integer and a radix-64 ASCII abort - generate an abnormal process abort abs - return an integer absolute value accept - accept a new connection on a socket access - determine accessibility of a file acos, acosf, acosl - arc cosine functions acosh, acoshf, acoshl - inverse hyperbolic cosine functions aio_cancel - cancel an asynchronous I/O request (\fBREALTIME\fP) aio_error - retrieve errors status for an asynchronous I/O operation aio_fsync - asynchronous file synchronization (\fBREALTIME\fP) aio_read - asynchronous read from a file (\fBREALTIME\fP) aio_return - retrieve return status of an asynchronous I/O operation aio_suspend - wait for an asynchronous I/O request (\fBREALTIME\fP) aio_write - asynchronous write to a file (\fBREALTIME\fP) alarm - schedule an alarm signal asctime, asctime_r - convert date and time to a string asin, asinf, asinl - arc sine function asinh, asinhf, asinhl - inverse hyperbolic sine functions assert - insert program diagnostics atan, atanf, atanl - arc tangent function atan2, atan2f, atan2l - arc tangent functions atanh, atanhf, atanhl - inverse hyperbolic tangent functions atexit - register a function to run at process termination atof - convert a string to a double-precision number atoi - convert a string to an integer atol, atoll - convert a string to a long integer basename - return the last component of a pathname bcmp - memory operations (\fBLEGACY\fP) bcopy - memory operations (\fBLEGACY\fP) bind - bind a name to a socket bsd_signal - simplified signal facilities bsearch - binary search a sorted table btowc - single byte to wide character conversion bzero - memory operations (\fBLEGACY\fP) cabs, cabsf, cabsl - return a complex absolute value cacos, cacosf, cacosl - complex arc cosine functions cacosh, cacoshf, cacoshl - complex arc hyperbolic cosine functions calloc - a memory allocator carg, cargf, cargl - complex argument functions casin, casinf, casinl - complex arc sine functions casinh, casinhf, casinhl - complex arc hyperbolic sine functions catan, catanf, catanl - complex arc tangent functions catanh, catanhf, catanhl - complex arc hyperbolic tangent functions catclose - close a message catalog descriptor catgets - read a program message catopen - open a message catalog cbrt, cbrtf, cbrtl - cube root functions ccos, ccosf, ccosl - complex cosine functions ccosh, ccoshf, ccoshl - complex hyperbolic cosine functions ceil, ceilf, ceill - ceiling value function cexp, cexpf, cexpl - complex exponential functions cfgetispeed - get input baud rate cfgetospeed - get output baud rate cfsetispeed - set input baud rate cfsetospeed - set output baud rate chdir - change working directory chmod - change mode of a file chown - change owner and group of a file cimag, cimagf, cimagl - complex imaginary functions clearerr - clear indicators on a stream clock - report CPU time used clock_getcpuclockid - access a process CPU-time clock (\fBADVANCED clock_getres, clock_gettime, clock_settime - clock and timer functions clock_nanosleep - high resolution sleep with specifiable clock (\fBADVANCED clog, clogf, clogl - complex natural logarithm functions close - close a file descriptor closedir - close a directory stream confstr - get configurable variables conj, conjf, conjl - complex conjugate functions connect - connect a socket copysign, copysignf, copysignl - number manipulation function cos, cosf, cosl - cosine function cosh, coshf, coshl - hyperbolic cosine functions cpow, cpowf, cpowl - complex power functions cproj, cprojf, cprojl - complex projection functions creal, crealf, creall - complex real functions creat - create a new file or rewrite an existing one crypt - string encoding function (\fBCRYPT\fP) csin, csinf, csinl - complex sine functions csinh, csinhf, csinhl - complex hyperbolic sine functions csqrt, csqrtf, csqrtl - complex square root functions ctan, ctanf, ctanl - complex tangent functions ctanh, ctanhf, ctanhl - complex hyperbolic tangent functions ctermid - generate a pathname for the controlling terminal ctime, ctime_r - convert a time value to a date and time string dbm_clearerr, dbm_close, dbm_delete, dbm_error, dbm_fetch, dbm_firstkey, - dbm_nextkey, dbm_open, dbm_store database difftime - compute the difference between two calendar time values dirname - report the parent directory name of a file pathname div - compute the quotient and remainder of an integer division dlclose - close a dlopen object dlerror - get diagnostic information dlopen - gain access to an executable object file dlsym - obtain the address of a symbol from a dlopen object drand48, erand48, jrand48, lcong48, lrand48, mrand48, nrand48, seed48, - srand48 generate uniformly distributed dup, dup2 - duplicate an open file descriptor ecvt, fcvt, gcvt - convert a floating-point number to a string (\fBLEGACY\fP) encrypt - encoding function (\fBCRYPT\fP) erf, erff, erfl - error functions erfc, erfcf, erfcl - complementary error functions errno - error return value environ, execl, execv, execle, execve, execlp, execvp - execute a exit, _Exit, _exit - terminate a process exp, expf, expl - exponential function exp2, exp2f, exp2l - exponential base 2 functions expm1, expm1f, expm1l - compute exponential functions fabs, fabsf, fabsl - absolute value function fattach - attach a STREAMS-based file descriptor to a file in the fchdir - change working directory fchmod - change mode of a file fchown - change owner and group of a file fclose - close a stream fcntl - file control fdatasync - synchronize the data of a file (\fBREALTIME\fP) fdetach - detach a name from a STREAMS-based file descriptor (\fBSTREAMS\fP) fdim, fdimf, fdiml - compute positive difference between two floating-point fdopen - associate a stream with a file descriptor feclearexcept - clear floating-point exception fegetenv, fesetenv - get and set current floating-point environment fegetexceptflag, fesetexceptflag - get and set floating-point status fegetround, fesetround - get and set current rounding direction feholdexcept - save current floating-point environment feof - test end-of-file indicator on a stream feraiseexcept - raise floating-point exception ferror - test error indicator on a stream fetestexcept - test floating-point exception flags feupdateenv - update floating-point environment fflush - flush a stream ffs - find first set bit fgetc - get a byte from a stream fgetpos - get current file position information fgets - get a string from a stream fgetwc - get a wide-character code from a stream fgetws - get a wide-character string from a stream fileno - map a stream pointer to a file descriptor flockfile, ftrylockfile, funlockfile - stdio locking functions floor, floorf, floorl - floor function fma, fmaf, fmal - floating-point multiply-add fmax, fmaxf, fmaxl - determine maximum numeric value of two floating-point fmin, fminf, fminl - determine minimum numeric value of two floating-point fmod, fmodf, fmodl - floating-point remainder value function fmtmsg - display a message in the specified format on standard error fnmatch - match a filename or a pathname fopen - open a stream fork - create a new process fpclassify - classify real floating type fputc - put a byte on a stream fputs - put a string on a stream fputwc - put a wide-character code on a stream fputws - put a wide-character string on a stream fread - binary input free - free allocated memory freopen - open a stream frexp, frexpf, frexpl - extract mantissa and exponent from a double fseek, fseeko - reposition a file-position indicator in a stream fsetpos - set current file position fstat - get file status fsync - synchronize changes to a file ftell, ftello - return a file offset in a stream ftime - get date and time (\fBLEGACY\fP) ftok - generate an IPC key ftruncate - truncate a file to a specified length ftw - traverse (walk) a file tree fwide - set stream orientation fwrite - binary output gai_strerror - address and name information error description freeaddrinfo, getaddrinfo - get address information getc - get a byte from a stream getchar - get a byte from a stdin stream getc_unlocked, getchar_unlocked, putc_unlocked, putchar_unlocked - stdio with explicit client locking getcontext, setcontext - get and set current user context getcwd - get the pathname of the current working directory getdate - convert user format date and time getegid - get the effective group ID getenv - get value of an environment variable geteuid - get the effective user ID getgid - get the real group ID endgrent, getgrent, setgrent - group database entry functions getgrgid, getgrgid_r - get group database entry for a group ID getgrnam, getgrnam_r - search group database for a name getgroups - get supplementary group IDs gethostbyaddr, gethostbyname - network host database functions endhostent, gethostent, sethostent - network host database functions gethostid - get an identifier for the current host gethostname - get name of current host getitimer, setitimer - get and set value of interval timer getlogin, getlogin_r - get login name getmsg, getpmsg - receive next message from a STREAMS file (\fBSTREAMS\fP) getnameinfo - get name information endnetent, getnetbyaddr, getnetbyname, getnetent, setnetent - network getopt, optarg, opterr, optind, optopt - command option parsing getpeername - get the name of the peer socket getpgid - get the process group ID for a process getpgrp - get the process group ID of the calling process getpid - get the process ID getppid - get the parent process ID getpriority, setpriority - get and set the nice value endprotoent, getprotobyname, getprotobynumber, getprotoent, setprotoent - network protocol database endpwent, getpwent, setpwent - user database functions getpwnam, getpwnam_r - search user database for a name getpwuid, getpwuid_r - search user database for a user ID getrlimit, setrlimit - control maximum resource consumption getrusage - get information about resource utilization gets - get a string from a stdin stream endservent, getservbyname, getservbyport, getservent, setservent - network services database functions getsid - get the process group ID of a session leader getsockname - get the socket name getsockopt - get the socket options getsubopt - parse suboption arguments from a string gettimeofday - get the date and time getuid - get a real user ID endutxent, getutxent, getutxid, getutxline, pututxline, setutxent - user accounting database functions getwc - get a wide character from a stream getwchar - get a wide character from a stdin stream getwd - get the current working directory pathname (\fBLEGACY\fP) glob, globfree - generate pathnames matching a pattern gmtime, gmtime_r - convert a time value to a broken-down UTC time grantpt - grant access to the slave pseudo-terminal device h_errno - error return value for network database operations hcreate, hdestroy, hsearch - manage hash search table htonl, htons, ntohl, ntohs - convert values between host and network hypot, hypotf, hypotl - Euclidean distance function iconv - codeset conversion function iconv_close - codeset conversion deallocation function iconv_open - codeset conversion allocation function if_freenameindex - free memory allocated by if_nameindex if_indextoname - map a network interface index to its corresponding if_nameindex - return all network interface names and indexes if_nametoindex - map a network interface name to its corresponding ilogb, ilogbf, ilogbl - return an unbiased exponent imaxabs - return absolute value imaxdiv - return quotient and remainder index - character string operations (\fBLEGACY\fP) inet_addr, inet_ntoa - IPv4 address manipulation inet_ntop, inet_pton - convert IPv4 and IPv6 addresses between binary insque, remque - insert or remove an element in a queue ioctl - control a STREAMS device (\fBSTREAMS\fP) isalnum - test for an alphanumeric character isalpha - test for an alphabetic character isascii - test for a 7-bit US-ASCII character isastream - test a file descriptor (\fBSTREAMS\fP) isatty - test for a terminal device isblank - test for a blank character iscntrl - test for a control character isdigit - test for a decimal digit isfinite - test for finite value isgraph - test for a visible character isgreater - test if x greater than y isgreaterequal - test if x is greater than or equal to y isinf - test for infinity isless - test if x is less than y islessequal - test if x is less than or equal to y islessgreater - test if x is less than or greater than y islower - test for a lowercase letter isnan - test for a NaN isnormal - test for a normal value isprint - test for a printable character ispunct - test for a punctuation character isspace - test for a white-space character isunordered - test if arguments are unordered isupper - test for an uppercase letter iswalnum - test for an alphanumeric wide-character code iswalpha - test for an alphabetic wide-character code iswblank - test for a blank wide-character code iswcntrl - test for a control wide-character code iswctype - test character for a specified class iswdigit - test for a decimal digit wide-character code iswgraph - test for a visible wide-character code iswlower - test for a lowercase letter wide-character code iswprint - test for a printable wide-character code iswpunct - test for a punctuation wide-character code iswspace - test for a white-space wide-character code iswupper - test for an uppercase letter wide-character code iswxdigit - test for a hexadecimal digit wide-character code isxdigit - test for a hexadecimal digit j0, j1, jn - Bessel functions of the first kind kill - send a signal to a process or a group of processes killpg - send a signal to a process group labs, llabs - return a long integer absolute value lchown - change the owner and group of a symbolic link ldexp, ldexpf, ldexpl - load exponent of a floating-point number ldiv, lldiv - compute quotient and remainder of a long division lgamma, lgammaf, lgammal - log gamma function link - link to a file lio_listio - list directed I/O (\fBREALTIME\fP) listen - listen for socket connections and limit the queue of incoming llrint, llrintf, llrintl - round to the nearest integer value using llround, llroundf, llroundl - round to nearest integer value localeconv - return locale-specific information localtime, localtime_r - convert a time value to a broken-down local lockf - record locking on files log, logf, logl - natural logarithm function log10, log10f, log10l - base 10 logarithm function log1p, log1pf, log1pl - compute a natural logarithm log2, log2f, log2l - compute base 2 logarithm functions logb, logbf, logbl - radix-independent exponent longjmp - non-local goto lrint, lrintf, lrintl - round to nearest integer value using current lround, lroundf, lroundl - round to nearest integer value lsearch, lfind - linear search and update lseek - move the read/write file offset lstat - get symbolic link status makecontext, swapcontext - manipulate user contexts malloc - a memory allocator mblen - get number of bytes in a character mbrlen - get number of bytes in a character (restartable) mbrtowc - convert a character to a wide-character code (restartable) mbsinit - determine conversion object status mbsrtowcs - convert a character string to a wide-character string mbstowcs - convert a character string to a wide-character string mbtowc - convert a character to a wide-character code memccpy - copy bytes in memory memchr - find byte in memory memcmp - compare bytes in memory memcpy - copy bytes in memory memmove - copy bytes in memory with overlapping areas memset - set bytes in memory mkdir - make a directory mkfifo - make a FIFO special file mknod - make a directory, a special file, or a regular file mkstemp - make a unique filename mktemp - make a unique filename (\fBLEGACY\fP) mktime - convert broken-down time into time since the Epoch mlock, munlock - lock or unlock a range of process address space (\fBREALTIME\fP) mlockall, munlockall - lock/unlock the address space of a process mmap - map pages of memory modf, modff, modfl - decompose a floating-point number mprotect - set protection of memory mapping mq_close - close a message queue (\fBREALTIME\fP) mq_getattr - get message queue attributes (\fBREALTIME\fP) mq_notify - notify process that a message is available (\fBREALTIME\fP) mq_open - open a message queue (\fBREALTIME\fP) mq_receive, mq_timedreceive - receive a message from a message queue mq_send, mq_timedsend - send a message to a message queue (\fBREALTIME\fP) mq_setattr - set message queue attributes (\fBREALTIME\fP) mq_unlink - remove a message queue (\fBREALTIME\fP) msgctl - XSI message control operations msgget - get the XSI message queue identifier msgrcv - XSI message receive operation msgsnd - XSI message send operation msync - synchronize memory with physical storage munmap - unmap pages of memory nan, nanf, nanl - return quiet NaN nanosleep - high resolution sleep (\fBREALTIME\fP) nearbyint, nearbyintf, nearbyintl - floating-point rounding functions nextafter, nextafterf, nextafterl, nexttoward, nexttowardf, nexttowardl - next representable floating-point nftw - walk a file tree nice - change the nice value of a process nl_langinfo - language information open - open a file opendir - open a directory fpathconf, pathconf - get configurable pathname variables pause - suspend the thread until a signal is received pclose - close a pipe stream to or from a process perror - write error messages to standard error pipe - create an interprocess channel poll - input/output multiplexing popen - initiate pipe streams to or from a process posix_fadvise - file advisory information (\fBADVANCED REALTIME\fP) posix_fallocate - file space control (\fBADVANCED REALTIME\fP) posix_madvise - memory advisory information and alignment control posix_mem_offset - find offset and length of a mapped typed memory posix_memalign - aligned memory allocation (\fBADVANCED REALTIME\fP) posix_openpt - open a pseudo-terminal device posix_spawn, posix_spawnp - spawn a process (\fBADVANCED REALTIME\fP) posix_spawn_file_actions_adddup2 - add dup2 action to spawn file actions posix_spawn_file_actions_addclose, posix_spawn_file_actions_addopen - add close or open action to spawn file actions posix_spawn_file_actions_destroy, posix_spawn_file_actions_init - destroy and initialize spawn file actions object posix_spawnattr_getflags, posix_spawnattr_setflags - get and set the posix_spawnattr_getpgroup, posix_spawnattr_setpgroup - get and set posix_spawnattr_getschedparam, posix_spawnattr_setschedparam - get posix_spawnattr_getschedpolicy, posix_spawnattr_setschedpolicy - get posix_spawnattr_getsigdefault, posix_spawnattr_setsigdefault - get posix_spawnattr_getsigmask, posix_spawnattr_setsigmask - get and set posix_spawnattr_destroy, posix_spawnattr_init - destroy and initialize posix_trace_attr_getinherited, posix_trace_attr_getlogfullpolicy, - posix_trace_attr_getstreamfullpolicy, posix_trace_attr_setinherited, posix_trace_attr_setlogfullpolicy, posix_trace_attr_setstreamfullpolicy retrieve and set the posix_trace_attr_getlogsize, posix_trace_attr_getmaxdatasize, posix_trace_attr_getmaxsystemeventsize, - posix_trace_attr_getmaxusereventsize, posix_trace_attr_getstreamsize, posix_trace_attr_setlogsize, posix_trace_attr_setmaxdatasize, posix_trace_attr_setstreamsize retrieve and set trace stream size posix_trace_attr_getclockres, posix_trace_attr_getcreatetime, posix_trace_attr_getgenversion, - posix_trace_attr_getname, posix_trace_attr_setname retrieve and set information about a trace posix_trace_attr_destroy, posix_trace_attr_init - destroy and initialize posix_trace_clear - clear trace stream and trace log (\fBTRACING\fP) posix_trace_create, posix_trace_create_withlog, posix_trace_flush, - posix_trace_shutdown trace stream initialization, posix_trace_event, posix_trace_eventid_open - trace functions for posix_trace_eventid_equal, posix_trace_eventid_get_name, posix_trace_trid_eventid_open - manipulate the trace event posix_trace_eventset_add, posix_trace_eventset_del, posix_trace_eventset_empty, - posix_trace_eventset_fill, posix_trace_eventset_ismember manipulate trace event type sets (\fBTRACING\fP) posix_trace_eventtypelist_getnext_id, posix_trace_eventtypelist_rewind - iterate over a mapping of trace event types posix_trace_get_filter, posix_trace_set_filter - retrieve and set posix_trace_get_attr, posix_trace_get_status - retrieve the trace posix_trace_getnext_event, posix_trace_timedgetnext_event, posix_trace_trygetnext_event - retrieve a trace event posix_trace_close, posix_trace_open, posix_trace_rewind - trace log posix_trace_start, posix_trace_stop - trace start and stop (\fBTRACING\fP) posix_typed_mem_get_info - query typed memory information (\fBADVANCED posix_typed_mem_open - open a typed memory object (\fBADVANCED REALTIME\fP) pow, powf, powl - power function fprintf, printf, snprintf, sprintf - print formatted output pthread_atfork - register fork handlers pthread_attr_getdetachstate, pthread_attr_setdetachstate - get and pthread_attr_getguardsize, pthread_attr_setguardsize - get and set pthread_attr_getinheritsched, pthread_attr_setinheritsched - get and pthread_attr_getschedparam, pthread_attr_setschedparam - get and set pthread_attr_getschedpolicy, pthread_attr_setschedpolicy - get and pthread_attr_getscope, pthread_attr_setscope - get and set the contentionscope pthread_attr_getstack, pthread_attr_setstack - get and set stack attributes pthread_attr_getstackaddr, pthread_attr_setstackaddr - get and set pthread_attr_getstacksize, pthread_attr_setstacksize - get and set pthread_attr_destroy, pthread_attr_init - destroy and initialize the pthread_barrier_destroy, pthread_barrier_init - destroy and initialize pthread_barrier_wait - synchronize at a barrier (\fBADVANCED REALTIME pthread_barrierattr_getpshared, pthread_barrierattr_setpshared - get pthread_barrierattr_destroy, pthread_barrierattr_init - destroy and pthread_cancel - cancel execution of a thread pthread_cleanup_pop, pthread_cleanup_push - establish cancellation pthread_cond_destroy, pthread_cond_init - destroy and initialize condition pthread_cond_broadcast, pthread_cond_signal - broadcast or signal pthread_cond_timedwait, pthread_cond_wait - wait on a condition pthread_condattr_getclock, pthread_condattr_setclock - get and set pthread_condattr_getpshared, pthread_condattr_setpshared - get and pthread_condattr_destroy, pthread_condattr_init - destroy and initialize pthread_create - thread creation pthread_detach - detach a thread pthread_equal - compare thread IDs pthread_exit - thread termination pthread_getconcurrency, pthread_setconcurrency - get and set the level pthread_getcpuclockid - access a thread CPU-time clock (\fBADVANCED pthread_getschedparam, pthread_setschedparam - dynamic thread scheduling pthread_getspecific, pthread_setspecific - thread-specific data management pthread_join - wait for thread termination pthread_key_create - thread-specific data key creation pthread_key_delete - thread-specific data key deletion pthread_kill - send a signal to a thread pthread_mutex_getprioceiling, pthread_mutex_setprioceiling - get and pthread_mutex_destroy, pthread_mutex_init - destroy and initialize pthread_mutex_lock, pthread_mutex_trylock, pthread_mutex_unlock - lock and unlock a mutex pthread_mutex_timedlock - lock a mutex (\fBADVANCED REALTIME\fP) pthread_mutexattr_getprioceiling, pthread_mutexattr_setprioceiling - get and set the prioceiling attribute of the mutex pthread_mutexattr_getprotocol, pthread_mutexattr_setprotocol - get pthread_mutexattr_getpshared, pthread_mutexattr_setpshared - get and pthread_mutexattr_gettype, pthread_mutexattr_settype - get and set pthread_mutexattr_destroy, pthread_mutexattr_init - destroy and initialize pthread_once - dynamic package initialization pthread_rwlock_destroy, pthread_rwlock_init - destroy and initialize pthread_rwlock_rdlock, pthread_rwlock_tryrdlock - lock a read-write pthread_rwlock_timedrdlock - lock a read-write lock for reading pthread_rwlock_timedwrlock - lock a read-write lock for writing pthread_rwlock_unlock - unlock a read-write lock object pthread_rwlock_trywrlock, pthread_rwlock_wrlock - lock a read-write pthread_rwlockattr_getpshared, pthread_rwlockattr_setpshared - get pthread_rwlockattr_destroy, pthread_rwlockattr_init - destroy and pthread_self - get the calling thread ID pthread_setschedprio - dynamic thread scheduling parameters access pthread_spin_destroy, pthread_spin_init - destroy or initialize a pthread_spin_lock, pthread_spin_trylock - lock a spin lock object pthread_spin_unlock - unlock a spin lock object (\fBADVANCED REALTIME pthread_setcancelstate, pthread_setcanceltype, pthread_testcancel - set cancelability state ptsname - get name of the slave pseudo-terminal device putc - put a byte on a stream putchar - put a byte on a stdout stream putenv - change or add a value to an environment putmsg, putpmsg - send a message on a STREAM (\fBSTREAMS\fP) puts - put a string on standard output putwc - put a wide character on a stream putwchar - put a wide character on a stdout stream qsort - sort a table of data raise - send a signal to the executing process rand, rand_r, srand - pseudo-random number generator initstate, random, setstate, srandom - pseudo-random number functions pread, read - read from a file readdir, readdir_r - read a directory readlink - read the contents of a symbolic link readv - read a vector realloc - memory reallocator realpath - resolve a pathname recv - receive a message from a connected socket recvfrom - receive a message from a socket recvmsg - receive a message from a socket regcomp, regerror, regexec, regfree - regular expression matching remainder, remainderf, remainderl - remainder function remove - remove a file remquo, remquof, remquol - remainder functions rename - rename a file rewind - reset the file position indicator in a stream rewinddir - reset the position of a directory stream to the beginning rindex - character string operations (\fBLEGACY\fP) rint, rintf, rintl - round-to-nearest integral value rmdir - remove a directory round, roundf, roundl - round to the nearest integer value in a floating-point scalb - load exponent of a radix-independent floating-point number scalbln, scalblnf, scalblnl, scalbn, scalbnf, scalbnl - compute exponent fscanf, scanf, sscanf - convert formatted input sched_get_priority_max, sched_get_priority_min - get priority limits sched_getparam - get scheduling parameters (\fBREALTIME\fP) sched_getscheduler - get scheduling policy (\fBREALTIME\fP) sched_rr_get_interval - get execution time limits (\fBREALTIME\fP) sched_setparam - set scheduling parameters (\fBREALTIME\fP) sched_setscheduler - set scheduling policy and parameters (\fBREALTIME\fP) sched_yield - yield the processor seekdir - set the position of a directory stream pselect, select - synchronous I/O multiplexing sem_close - close a named semaphore (\fBREALTIME\fP) sem_destroy - destroy an unnamed semaphore (\fBREALTIME\fP) sem_getvalue - get the value of a semaphore (\fBREALTIME\fP) sem_init - initialize an unnamed semaphore (\fBREALTIME\fP) sem_open - initialize and open a named semaphore (\fBREALTIME\fP) sem_post - unlock a semaphore (\fBREALTIME\fP) sem_timedwait - lock a semaphore (\fBADVANCED REALTIME\fP) sem_unlink - remove a named semaphore (\fBREALTIME\fP) sem_trywait, sem_wait - lock a semaphore (\fBREALTIME\fP) semctl - XSI semaphore control operations semget - get set of XSI semaphores semop - XSI semaphore operations send - send a message on a socket sendmsg - send a message on a socket using a message structure sendto - send a message on a socket setbuf - assign buffering to a stream setegid - set the effective group ID setenv - add or change environment variable seteuid - set effective user ID setgid - set-group-ID setjmp - set jump point for a non-local goto setkey - set encoding key (\fBCRYPT\fP) setlocale - set program locale setpgid - set process group ID for job control setpgrp - set the process group ID setregid - set real and effective group IDs setreuid - set real and effective user IDs setsid - create session and set process group ID setsockopt - set the socket options setuid - set user ID setvbuf - assign buffering to a stream shm_open - open a shared memory object (\fBREALTIME\fP) shm_unlink - remove a shared memory object (\fBREALTIME\fP) shmat - XSI shared memory attach operation shmctl - XSI shared memory control operations shmdt - XSI shared memory detach operation shmget - get an XSI shared memory segment shutdown - shut down socket send and receive operations sigaction - examine and change a signal action sigaddset - add a signal to a signal set sigaltstack - set and get signal alternate stack context sigdelset - delete a signal from a signal set sigemptyset - initialize and empty a signal set sigfillset - initialize and fill a signal set siginterrupt - allow signals to interrupt functions sigismember - test for a signal in a signal set siglongjmp - non-local goto with signal handling signal - signal management signbit - test sign sigpending - examine pending signals pthread_sigmask, sigprocmask - examine and change blocked signals sigqueue - queue a signal to a process (\fBREALTIME\fP) sighold, sigignore, sigpause, sigrelse, sigset - signal management sigsetjmp - set jump point for a non-local goto sigsuspend - wait for a signal sigwait - wait for queued signals sigtimedwait, sigwaitinfo - wait for queued signals (\fBREALTIME\fP) sin, sinf, sinl - sine function sinh, sinhf, sinhl - hyperbolic sine functions sleep - suspend execution for an interval of time sockatmark - determine whether a socket is at the out-of-band mark socket - create an endpoint for communication socketpair - create a pair of connected sockets sqrt, sqrtf, sqrtl - square root function stat - get file status fstatvfs, statvfs - get file system information stderr, stdin, stdout - standard I/O streams strcasecmp, strncasecmp - case-insensitive string comparisons strcat - concatenate two strings strchr - string scanning operation strcmp - compare two strings strcoll - string comparison using collating information strcpy - copy a string strcspn - get the length of a complementary substring strdup - duplicate a string strerror, strerror_r - get error message string strfmon - convert monetary value to a string strftime - convert date and time to a string strlen - get string length strncat - concatenate a string with part of another strncmp - compare part of two strings strncpy - copy part of a string strpbrk - scan a string for a byte strptime - date and time conversion strrchr - string scanning operation strspn - get length of a substring strstr - find a substring strtod, strtof, strtold - convert a string to a double-precision number strtoimax, strtoumax - convert string to integer type strtok, strtok_r - split string into tokens strtol, strtoll - convert a string to a long integer strtoul, strtoull - convert a string to an unsigned long strxfrm - string transformation swab - swap bytes symlink - make a symbolic link to a file sync - schedule file system updates sysconf - get configurable system variables closelog, openlog, setlogmask, syslog - control system log system - issue a command tan, tanf, tanl - tangent function tanh, tanhf, tanhl - hyperbolic tangent functions tcdrain - wait for transmission of output tcflow - suspend or restart the transmission or reception of data tcflush - flush non-transmitted output data, non-read input data, tcgetattr - get the parameters associated with the terminal tcgetpgrp - get the foreground process group ID tcgetsid - get the process group ID for the session leader for the tcsendbreak - send a break for a specific duration tcsetattr - set the parameters associated with the terminal tcsetpgrp - set the foreground process group ID telldir - current location of a named directory stream tempnam - create a name for a temporary file tgamma, tgammaf, tgammal - compute gamma() function time - get time timer_create - create a per-process timer (\fBREALTIME\fP) timer_delete - delete a per-process timer (\fBREALTIME\fP) timer_getoverrun, timer_gettime, timer_settime - per-process timers times - get process and waited-for child process times tmpfile - create a temporary file tmpnam - create a name for a temporary file toascii - translate an integer to a 7-bit ASCII character tolower - transliterate uppercase characters to lowercase toupper - transliterate lowercase characters to uppercase towctrans - wide-character transliteration towlower - transliterate uppercase wide-character code to lowercase towupper - transliterate lowercase wide-character code to uppercase trunc, truncf, truncl - round to truncated integer value truncate - truncate a file to a specified length tdelete, tfind, tsearch, twalk - manage a binary search tree ttyname, ttyname_r - find the pathname of a terminal daylight, timezone, tzname, tzset - set timezone conversion information ualarm - set the interval timer ulimit - get and set process limits umask - set and get the file mode creation mask uname - get the name of the current system ungetc - push byte back into input stream ungetwc - push wide-character code back into the input stream unlink - remove a directory entry unlockpt - unlock a pseudo-terminal master/slave pair unsetenv - remove an environment variable usleep - suspend execution for an interval utime - set file access and modification times utimes - set file access and modification times (\fBLEGACY\fP) va_arg, va_copy, va_end, va_start - handle variable argument list vfork - create a new process; share virtual memory vfprintf, vprintf, vsnprintf, vsprintf - format output of a stdarg vfscanf, vscanf, vsscanf - format input of a stdarg argument list vfwprintf, vswprintf, vwprintf - wide-character formatted output of vfwscanf, vswscanf, vwscanf - wide-character formatted input of a wait, waitpid - wait for a child process to stop or terminate waitid - wait for a child process to change state wcrtomb - convert a wide-character code to a character (restartable) wcscat - concatenate two wide-character strings wcschr - wide-character string scanning operation wcscmp - compare two wide-character strings wcscoll - wide-character string comparison using collating information wcscpy - copy a wide-character string wcscspn - get the length of a complementary wide substring wcsftime - convert date and time to a wide-character string wcslen - get wide-character string length wcsncat - concatenate a wide-character string with part of another wcsncmp - compare part of two wide-character strings wcsncpy - copy part of a wide-character string wcspbrk - scan a wide-character string for a wide-character code wcsrchr - wide-character string scanning operation wcsrtombs - convert a wide-character string to a character string wcsspn - get the length of a wide substring wcsstr - find a wide-character substring wcstod, wcstof, wcstold - convert a wide-character string to a double-precision wcstoimax, wcstoumax - convert a wide-character string to an integer wcstok - split a wide-character string into tokens wcstol, wcstoll - convert a wide-character string to a long integer wcstombs - convert a wide-character string to a character string wcstoul, wcstoull - convert a wide-character string to an unsigned wcswcs - find a wide substring (\fBLEGACY\fP) wcswidth - number of column positions of a wide-character string wcsxfrm - wide-character string transformation wctob - wide-character to single-byte conversion wctomb - convert a wide-character code to a character wctrans - define character mapping wctype - define character class wcwidth - number of column positions of a wide-character code wmemchr - find a wide character in memory wmemcmp - compare wide characters in memory wmemcpy - copy wide characters in memory wmemmove - copy wide characters in memory with overlapping areas wmemset - set wide characters in memory wordexp, wordfree - perform word expansions fwprintf, swprintf, wprintf - print formatted wide-character output pwrite, write - write on a file writev - write a vector fwscanf, swscanf, wscanf - convert formatted wide-character input y0, y1, yn - Bessel functions of the second kind

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