C library (3C)

`a64l`	convert between long integer and base-64 ASCII string
`abort`	generate an abnormal termination signal
`abs`	return integer absolute value
`addseverity`	build a list of severity levels for an application for use with fmtmsg
`atexit`	add program termination routine
`bsearch`	binary search a sorted table
`catgets`	read a program message
`catopen`	open/close a message catalogue
`clock`	report CPU time used
`conv`	translate characters
`crypt`	generate encryption
`ctime`	convert date and time to string
`ctype`	character handling
`decconv`	convert between binary and decimal values
`difftime`	computes the difference between two calendar times
`directory`	directory operations
`div`	compute the quotient and remainder
`drand48`	generate uniformly distributed pseudo-random numbers
`dup2`	duplicate an open file descriptor
`ecvt`	convert floating-point number to string
`end`	last locations in program
`fattach`	attach a STREAMS-based file descriptor to an object in the file system name space
`fdetach`	detach a name from a STREAMS-based file descriptor
`ffs`	find first set bit
`fmtmsg`	display a message on stderr or system console
`fpgetround`	IEEE floating-point environment control
`frexp`	manipulate parts of floating-point numbers
`fsetpos`	reposition a file pointer in a stream
`ftw`	walk a file tree
`getcwd`	get pathname of current working directory
`getdate`	convert user format date and time
`getenv`	return value for environment name
`getgrent`	get group file entry
`getitimer`	get/set value of interval timer
`getlogin`	get login name
`getmntent`	get mnttab file entry
`getopt`	get option letter from argument vector
`getpass`	read a password
`getpw`	get name from UID
`getpwent`	manipulate password file entry
`getspent`	manipulate shadow password file entry
`getsubopt`	parse suboptions from a string
`gettxt`	retrieve a text string
`getut`	access utmp file entry
`getutx`	access utmpx file entry
`getvfsent`	get vfstab file entry
`grantpt`	grant access to the slave pseudo-terminal device
`hsearch`	manage hash search tables
`initgroups`	initialize the supplementary group access list
`insque`	insert/remove element from a queue
`isastream`	test a file descriptor
`isnan`	determine type of floating-point number
`l3tol`	convert between 3-byte integers and long integers
`localeconv`	get numeric formatting information
`lockf`	record locking on files
`lsearch`	linear search and update
`makecontext`	manipulate user contexts
`makedev`	manage a device number
`malloc`	memory allocator
`mbchar`	multibyte character handling
`mbstring`	multibyte string functions
`memory`	memory operations
`mkfifo`	create a new FIFO
`mktemp`	make a unique file name
`mktime`	converts a tm structure to a calendar time
`mlock`	lock (or unlock) pages in memory
`mlockall`	lock or unlock address space
`monitor`	prepare execution profile
`msync`	synchronize memory with physical storage
`nl_langinfo`	language information
`offsetof`	offset of structure member
`perror`	print system error messages
`psignal`	system signal messages
`ptsname`	get name of the slave pseudo-terminal device
`putenv`	change or add value to environment
`putpwent`	write password file entry
`putspent`	write shadow password file entry
`qsort`	quicker sort
`raise`	send signal to program
`rand`	simple random-number generator
`realpath`	returns the real file name
`remove`	remove file
`select`	synchronous I/O multiplexing
`setjmp`	non-local goto
`setlocale`	modify and query a program's locale
`sigsetjmp`	a non-local goto with signal state
`sigsetops`	manipulate sets of signals.
`sleep`	suspend execution for interval
`ssignal`	software signals
`stdipc`	standard interprocess communication package
`strcoll`	string collation
`strerror`	get error message string
`strftime`	convert date and time to string
`string`	string operations
`strtod`	convert string to double-precision number
`strtol`	convert string to integer
`strxfrm`	string transformation
`swab`	swap bytes
`sysconf`	get configurable system variables
`tcsetpgrp`	set terminal foreground process group id
`truncate`	set a file to a specified length
`tsearch`	manage binary search trees
`ttyname`	find name of a terminal
`ttyslot`	find the slot in the utmp file of the current user
`unlockpt`	unlock a pseudo-terminal master/slave pair