section 3posix · Library functions 📚

R (continued)

• readdir(3posix)read a directory✨
• readlink(3posix)read the contents of a symbolic link✨
• readv(3posix)read a vector✨
• realloc(3posix)memory reallocator✨
• realpath(3posix)resolve a pathname✨
• recv(3posix)receive a message from a connected socket✨
• recvfrom(3posix)receive a message from a socket✨
• recvmsg(3posix)receive a message from a socket✨
• regcomp(3posix)regular expression matching✨
• remainder(3posix)remainder function✨
• remove(3posix)remove a file✨
• remque(3posix)remove an element from a queue✨
• remquo(3posix)remainder functions✨
• rename(3posix)rename file✨
• rewind(3posix)reset the file position indicator in a stream✨
• rewinddir(3posix)reset the position of a directory stream to the beginning of a directory✨
• rint(3posix)round-to-nearest integral value✨
• rmdir(3posix)remove a directory✨
• round(3posix)round to the nearest integer value in a floating-point format✨

S

• scalbln(3posix)compute exponent using FLT_RADIX✨
• scandir(3posix)scan a directory✨
• scanf(3posix)convert formatted input✨
• sched_get_priority_max(3posix)get priority limits (REALTIME)✨
• sched_getparam(3posix)get scheduling parameters (REALTIME)✨
• sched_getscheduler(3posix)get scheduling policy (REALTIME)✨
• sched_rr_get_interval(3posix)get execution time limits (REALTIME)✨
• sched_setparam(3posix)set scheduling parameters (REALTIME)✨
• sched_setscheduler(3posix)set scheduling policy and parameters (REALTIME)✨
• sched_yield(3posix)yield the processor✨
• seed48(3posix)seed a uniformly distributed pseudo-random non-negative long integer generator✨
• seekdir(3posix)set the position of a directory stream✨
• select(3posix)synchronous I/O multiplexing✨
• sem_close(3posix)close a named semaphore✨
• sem_destroy(3posix)destroy an unnamed semaphore✨
• sem_getvalue(3posix)get the value of a semaphore✨
• sem_init(3posix)initialize an unnamed semaphore✨
• sem_open(3posix)initialize and open a named semaphore✨
• sem_post(3posix)unlock a semaphore✨
• sem_timedwait(3posix)lock a semaphore✨
• sem_trywait(3posix)lock a semaphore✨
• sem_unlink(3posix)remove a named semaphore✨
• sem_wait(3posix)lock a semaphore✨
• semctl(3posix)XSI semaphore control operations✨
• semget(3posix)get set of XSI semaphores✨
• semop(3posix)XSI semaphore operations✨
• send(3posix)send a message on a socket✨
• sendmsg(3posix)send a message on a socket using a message structure✨
• sendto(3posix)send a message on a socket✨
• setbuf(3posix)assign buffering to a stream✨
• setegid(3posix)set the effective group ID✨
• setenv(3posix)add or change environment variable✨
• seteuid(3posix)set effective user ID✨
• setgid(3posix)set-group-ID✨
• setgrent(3posix)reset the group database to the first entry✨
• sethostent(3posix)network host database functions✨
• setitimer(3posix)set the value of an interval timer✨
• setjmp(3posix)set jump point for a non-local goto✨
• setkey(3posix)set encoding key (CRYPT)✨
• setlocale(3posix)set program locale✨
• setlogmask(3posix)set the log priority mask✨
• setnetent(3posix)network database function✨
• setpgid(3posix)set process group ID for job control✨
• setpgrp(3posix)set the process group ID✨
• setpriority(3posix)set the nice value✨
• setprotoent(3posix)network protocol database functions✨
• setpwent(3posix)user database function✨
• setregid(3posix)set real and effective group IDs✨
• setreuid(3posix)set real and effective user IDs✨
• setrlimit(3posix)control maximum resource consumption✨
• setservent(3posix)network services database functions✨
• setsid(3posix)create session and set process group ID✨
• setsockopt(3posix)set the socket options✨
• setstate(3posix)switch pseudo-random number generator state arrays✨
• setuid(3posix)set user ID✨
• setutxent(3posix)reset the user accounting database to the first entry✨
• setvbuf(3posix)assign buffering to a stream✨
• shm_open(3posix)open a shared memory object (REALTIME)✨
• shm_unlink(3posix)remove a shared memory object (REALTIME)✨
• shmat(3posix)XSI shared memory attach operation✨
• shmctl(3posix)XSI shared memory control operations✨
• shmdt(3posix)XSI shared memory detach operation✨
• shmget(3posix)get an XSI shared memory segment✨
• shutdown(3posix)shut down socket send and receive operations✨
• sigaction(3posix)examine and change a signal action✨
• sigaddset(3posix)add a signal to a signal set✨
• sigaltstack(3posix)set and get signal alternate stack context✨
• sigdelset(3posix)delete a signal from a signal set✨
• sigemptyset(3posix)initialize and empty a signal set✨
• sigfillset(3posix)initialize and fill a signal set✨
• sighold(3posix)signal management✨
• siginterrupt(3posix)allow signals to interrupt functions✨
• sigismember(3posix)test for a signal in a signal set✨
• siglongjmp(3posix)non-local goto with signal handling✨
• signal(3posix)signal management✨
• signbit(3posix)test sign✨
• signgam(3posix)log gamma function✨
• sigpause(3posix)remove a signal from the signal mask and suspend the thread✨
• sigpending(3posix)examine pending signals✨
• sigprocmask(3posix)examine and change blocked signals✨
• sigqueue(3posix)queue a signal to a process✨
• sigrelse(3posix)signal management✨
• sigsetjmp(3posix)set jump point for a non-local goto✨
• sigsuspend(3posix)wait for a signal✨
• sigtimedwait(3posix)wait for queued signals✨
• sigwait(3posix)wait for queued signals✨
• sigwaitinfo(3posix)wait for queued signals✨
• sin(3posix)sine function✨
• sinh(3posix)hyperbolic sine functions✨
• sinl(3posix)sine function✨
• sleep(3posix)suspend execution for an interval of time✨
• snprintf(3posix)print formatted output✨
• sockatmark(3posix)determine whether a socket is at the out-of-band mark✨
• socket(3posix)create an endpoint for communication✨
• socketpair(3posix)create a pair of connected sockets✨
• sprintf(3posix)print formatted output✨
• sqrt(3posix)square root function✨
• srand(3posix)pseudo-random number generator✨
• srand48(3posix)seed the uniformly distributed double-precision pseudo-random number generator✨
• srandom(3posix)seed pseudo-random number generator✨
• sscanf(3posix)convert formatted input✨
• stat(3posix)get file status✨
• statvfs(3posix)get file system information✨
• stdin(3posix)standard I/O streams✨
• stpcpy(3posix)copy a string and return a pointer to the end of the result✨
• stpncpy(3posix)copy fixed length string, returning a pointer to the array end✨
• strcasecmp(3posix)case-insensitive string comparisons✨
• strcat(3posix)concatenate two strings✨
• strchr(3posix)string scanning operation✨
• strcmp(3posix)compare two strings✨
• strcoll(3posix)string comparison using collating information✨
• strcpy(3posix)copy a string and return a pointer to the end of the result✨
• strcspn(3posix)get the length of a complementary substring✨
• strdup(3posix)duplicate a specific number of bytes from a string✨
• strerror(3posix)get error message string✨
• strfmon(3posix)convert monetary value to a string✨
• strftime(3posix)convert date and time to a string✨
• strlen(3posix)get length of fixed size string✨
• strncasecmp(3posix)case-insensitive string comparisons✨
• strncat(3posix)concatenate a string with part of another✨
• strncmp(3posix)compare part of two strings✨
• strncpy(3posix)copy fixed length string, returning a pointer to the array end✨
• strndup(3posix)duplicate a specific number of bytes from a string✨
• strnlen(3posix)get length of fixed size string✨
• strpbrk(3posix)scan a string for a byte✨
• strptime(3posix)date and time conversion✨
• strrchr(3posix)string scanning operation✨
• strsignal(3posix)get name of signal✨
• strspn(3posix)get length of a substring✨
• strstr(3posix)find a substring✨
• strtod(3posix)convert a string to a double-precision number✨
• strtoimax(3posix)convert string to integer type✨
• strtok(3posix)split string into tokens✨
• strtol(3posix)convert a string to a long integer✨
• strtold(3posix)convert a string to a double-precision number✨
• strtoll(3posix)convert a string to a long integer✨
• strtoul(3posix)convert a string to an unsigned long✨
• strtoumax(3posix)convert a string to an integer type✨
• strxfrm(3posix)string transformation✨
• swab(3posix)swap bytes✨
• swprintf(3posix)print formatted wide-character output✨
• swscanf(3posix)convert formatted wide-character input✨
• symlink(3posix)make a symbolic link✨
• sync(3posix)schedule file system updates✨
• sysconf(3posix)get configurable system variables✨
• syslog(3posix)log a message✨
• system(3posix)issue a command✨

T

• tan(3posix)tangent function✨
• tanh(3posix)hyperbolic tangent functions✨
• tanl(3posix)tangent function✨
• tcdrain(3posix)wait for transmission of output✨
• tcflow(3posix)suspend or restart the transmission or reception of data✨
• tcflush(3posix)flush non-transmitted output data, non-read input data, or both✨
• tcgetattr(3posix)get the parameters associated with the terminal✨
• tcgetpgrp(3posix)get the foreground process group ID✨
• tcgetsid(3posix)get the process group ID for the session leader for the controlling terminal✨
• tcsendbreak(3posix)send a break for a specific duration✨
• tcsetattr(3posix)set the parameters associated with the terminal✨
• tcsetpgrp(3posix)set the foreground process group ID✨
• tdelete(3posix)manage a binary search tree✨
• telldir(3posix)current location of a named directory stream✨
• tempnam(3posix)create a name for a temporary file✨
• tfind(3posix)search binary search tree✨
• tgamma(3posix)compute gamma() function✨
• time(3posix)get time✨
• timer_create(3posix)create a per-process timer✨
• timer_delete(3posix)delete a per-process timer✨
• timer_getoverrun(3posix)per-process timers✨
• times(3posix)get process and waited-for child process times✨
• timezone(3posix)difference from UTC and local standard time✨
• tmpfile(3posix)create a temporary file✨
• tmpnam(3posix)create a name for a temporary file✨
• toascii(3posix)translate an integer to a 7-bit ASCII character✨
• tolower(3posix)transliterate uppercase characters to lowercase✨
• toupper(3posix)transliterate lowercase characters to uppercase✨
• towctrans(3posix)wide-character transliteration✨
• towlower(3posix)transliterate uppercase wide-character code to lowercase✨
• towupper(3posix)transliterate lowercase wide-character code to uppercase✨
• trunc(3posix)round to truncated integer value✨
• truncate(3posix)truncate a file to a specified length✨
• truncf(3posix)round to truncated integer value✨