section 3p · Library functions 📚

F (continued)

• fsync(3p)synchronize changes to a file✨
• ftell(3p)return a file offset in a stream✨
• ftok(3p)generate an IPC key✨
• ftruncate(3p)truncate a file to a specified length✨
• ftrylockfile(3p)stdio locking functions✨
• ftw(3p)traverse (walk) a file tree✨
• funlockfile(3p)stdio locking functions✨
• futimens(3p)set file access and modification times✨
• fwide(3p)set stream orientation✨
• fwprintf(3p)print formatted wide-character output✨
• fwrite(3p)binary output✨
• fwscanf(3p)convert formatted wide-character input✨

G

• gai_strerror(3p)address and name information error description✨
• getaddrinfo(3p)get address information✨
• getc(3p)get a byte from a stream✨
• getc_unlocked(3p)stdio with explicit client locking✨
• getchar(3p)get a byte from a stdin stream✨
• getchar_unlocked(3p)stdio with explicit client locking✨
• getcwd(3p)get the pathname of the current working directory✨
• getdate(3p)convert user format date and time✨
• getdelim(3p)read a delimited record from stream✨
• getegid(3p)get the effective group ID✨
• getenv(3p)get value of an environment variable✨
• geteuid(3p)get the effective user ID✨
• getgid(3p)get the real group ID✨
• getgrent(3p)get the group database entry✨
• getgrgid(3p)get group database entry for a group ID✨
• getgrnam(3p)search group database for a name✨
• getgroups(3p)get supplementary group IDs✨
• gethostent(3p)network host database functions✨
• gethostid(3p)get an identifier for the current host✨
• gethostname(3p)get name of current host✨
• getitimer(3p)get and set value of interval timer✨
• getline(3p)read a delimited record from stream✨
• getlogin(3p)get login name✨
• getmsg(3p)receive next message from a STREAMS file (STREAMS)✨
• getnameinfo(3p)get name information✨
• getnetbyaddr(3p)network database functions✨
• getopt(3p)command option parsing✨
• getpeername(3p)get the name of the peer socket✨
• getpgid(3p)get the process group ID for a process✨
• getpgrp(3p)get the process group ID of the calling process✨
• getpid(3p)get the process ID✨
• getpmsg(3p)receive next message from a STREAMS file✨
• getppid(3p)get the parent process ID✨
• getpriority(3p)get and set the nice value✨
• getprotobyname(3p)network protocol database functions✨
• getpwent(3p)get user database entry✨
• getpwnam(3p)search user database for a name✨
• getpwuid(3p)search user database for a user ID✨
• getrlimit(3p)control maximum resource consumption✨
• getrusage(3p)get information about resource utilization✨
• gets(3p)get a string from a stdin stream✨
• getservbyname(3p)network services database functions✨
• getsid(3p)get the process group ID of a session leader✨
• getsockname(3p)get the socket name✨
• getsockopt(3p)get the socket options✨
• getsubopt(3p)parse suboption arguments from a string✨
• gettimeofday(3p)get the date and time✨
• getuid(3p)get a real user ID✨
• getutxent(3p)get user accounting database entries✨
• getwc(3p)get a wide character from a stream✨
• getwchar(3p)get a wide character from a stdin stream✨
• glob(3p)generate pathnames matching a pattern✨
• gmtime(3p)convert a time value to a broken-down UTC time✨
• grantpt(3p)grant access to the slave pseudo-terminal device✨

H

• hcreate(3p)manage hash search table✨
• htonl(3p)convert values between host and network byte order✨
• hypot(3p)Euclidean distance function✨

I

• iconv(3p)codeset conversion function✨
• iconv_close(3p)codeset conversion deallocation function✨
• iconv_open(3p)codeset conversion allocation function✨
• if_freenameindex(3p)free memory allocated by if_nameindex✨
• if_indextoname(3p)map a network interface index to its corresponding name✨
• if_nameindex(3p)return all network interface names and indexes✨
• if_nametoindex(3p)map a network interface name to its corresponding index✨
• ilogb(3p)return an unbiased exponent✨
• imaxabs(3p)return absolute value✨
• imaxdiv(3p)return quotient and remainder✨
• inet_addr(3p)IPv4 address manipulation✨
• inet_ntop(3p)convert IPv4 and IPv6 addresses between binary and text form✨
• initstate(3p)pseudo-random number functions✨
• insque(3p)insert or remove an element in a queue✨
• ioctl(3p)control a STREAMS device (STREAMS)✨
• isalnum(3p)test for an alphanumeric character✨
• isalpha(3p)test for an alphabetic character✨
• isascii(3p)test for a 7-bit US-ASCII character✨
• isastream(3p)test a file descriptor (STREAMS)✨
• isatty(3p)test for a terminal device✨
• isblank(3p)test for a blank character✨
• iscntrl(3p)test for a control character✨
• isdigit(3p)test for a decimal digit✨
• isfinite(3p)test for finite value✨
• isgraph(3p)test for a visible character✨
• isgreater(3p)test if x greater than y✨
• isgreaterequal(3p)test if x is greater than or equal to y✨
• isinf(3p)test for infinity✨
• isless(3p)test if x is less than y✨
• islessequal(3p)test if x is less than or equal to y✨
• islessgreater(3p)test if x is less than or greater than y✨
• islower(3p)test for a lowercase letter✨
• isnan(3p)test for a NaN✨
• isnormal(3p)test for a normal value✨
• isprint(3p)test for a printable character✨
• ispunct(3p)test for a punctuation character✨
• isspace(3p)test for a white-space character✨
• isunordered(3p)test if arguments are unordered✨
• isupper(3p)test for an uppercase letter✨
• iswalnum(3p)test for an alphanumeric wide-character code✨
• iswalpha(3p)test for an alphabetic wide-character code✨
• iswblank(3p)test for a blank wide-character code✨
• iswcntrl(3p)test for a control wide-character code✨
• iswctype(3p)test character for a specified class✨
• iswdigit(3p)test for a decimal digit wide-character code✨
• iswgraph(3p)test for a visible wide-character code✨
• iswlower(3p)test for a lowercase letter wide-character code✨
• iswprint(3p)test for a printable wide-character code✨
• iswpunct(3p)test for a punctuation wide-character code✨
• iswspace(3p)test for a white-space wide-character code✨
• iswupper(3p)test for an uppercase letter wide-character code✨
• iswxdigit(3p)test for a hexadecimal digit wide-character code✨
• isxdigit(3p)test for a hexadecimal digit✨

J

• j0(3p)Bessel functions of the first kind✨
• jrand48(3p)generate a uniformly distributed pseudo-random long signed integer✨

K

• kill(3p)send a signal to a process or a group of processes✨
• killpg(3p)send a signal to a process group✨

L

• l64a(3p)convert a 32-bit integer to a radix-64 ASCII string✨
• labs(3p)return a long integer absolute value✨
• lchown(3p)change the owner and group of a symbolic link✨
• lcong48(3p)seed a uniformly distributed pseudo-random signed long integer generator✨
• ldexp(3p)load exponent of a floating-point number✨
• ldiv(3p)compute quotient and remainder of a long division✨
• lfind(3p)find entry in a linear search table✨
• lgamma(3p)log gamma function✨
• link(3p)link one file to another file✨
• lio_listio(3p)list directed I/O✨
• listen(3p)listen for socket connections and limit the queue of incoming connections✨
• llabs(3p)return a long integer absolute value✨
• lldiv(3p)compute quotient and remainder of a long division✨
• llrint(3p)round to the nearest integer value using current rounding direction✨
• llround(3p)round to nearest integer value✨
• localeconv(3p)return locale-specific information✨
• localtime(3p)convert a time value to a broken-down local time✨
• lockf(3p)record locking on files✨
• log(3p)natural logarithm function✨
• log10(3p)base 10 logarithm function✨
• log1p(3p)compute a natural logarithm✨
• log2(3p)compute base 2 logarithm functions✨
• logb(3p)radix-independent exponent✨
• logf(3p)natural logarithm function✨
• longjmp(3p)non-local goto✨
• lrand48(3p)generate uniformly distributed pseudo-random non-negative long integers✨
• lrint(3p)round to nearest integer value using current rounding direction✨
• lround(3p)round to nearest integer value✨
• lsearch(3p)linear search and update✨
• lseek(3p)move the read/write file offset✨
• lstat(3p)get file status✨

M

• malloc(3p)a memory allocator✨
• mblen(3p)get number of bytes in a character✨
• mbrlen(3p)get number of bytes in a character (restartable)✨
• mbrtowc(3p)convert a character to a wide-character code (restartable)✨
• mbsinit(3p)determine conversion object status✨
• mbsrtowcs(3p)convert a character string to a wide-character string (restartable)✨
• mbstowcs(3p)convert a character string to a wide-character string✨
• mbtowc(3p)convert a character to a wide-character code✨
• memccpy(3p)copy bytes in memory✨
• memchr(3p)find byte in memory✨
• memcmp(3p)compare bytes in memory✨
• memcpy(3p)copy bytes in memory✨
• memmove(3p)copy bytes in memory with overlapping areas✨
• memset(3p)set bytes in memory✨
• mkdir(3p)make a directory✨
• mkdtemp(3p)create a unique directory or file✨
• mkfifo(3p)make a FIFO special file✨
• mknod(3p)make directory, special file, or regular file✨
• mkstemp(3p)create a unique file✨
• mktime(3p)convert broken-down time into time since the Epoch✨
• mlock(3p)lock or unlock a range of process address space (REALTIME)✨
• mlockall(3p)lock/unlock the address space of a process (REALTIME)✨
• mmap(3p)map pages of memory✨
• modf(3p)decompose a floating-point number✨
• mprotect(3p)set protection of memory mapping✨
• mq_close(3p)close a message queue (REALTIME)✨
• mq_getattr(3p)get message queue attributes (REALTIME)✨
• mq_notify(3p)notify process that a message is available (REALTIME)✨
• mq_open(3p)open a message queue (REALTIME)✨
• mq_receive(3p)receive a message from a message queue (REALTIME)✨
• mq_send(3p)send a message to a message queue (REALTIME)✨
• mq_setattr(3p)set message queue attributes (REALTIME)✨
• mq_timedreceive(3p)receive a message from a message queue (ADVANCED REALTIME)✨
• mq_timedsend(3p)send a message to a message queue (ADVANCED REALTIME)✨
• mq_unlink(3p)remove a message queue (REALTIME)✨
• mrand48(3p)generate uniformly distributed pseudo-random signed long integers✨
• msgctl(3p)XSI message control operations✨
• msgget(3p)get the XSI message queue identifier✨
• msgrcv(3p)XSI message receive operation✨
• msgsnd(3p)XSI message send operation✨
• msync(3p)synchronize memory with physical storage✨
• munlock(3p)unlock a range of process address space✨
• munlockall(3p)unlock the address space of a process✨