(3C) - Libc routines

Intro: introduction to libc library
a64l, l64a, l64a_r: convert between long integer and base-64 ASCII string
abort: generate an abnormal termination signal
abs, labs: return integer absolute value
aclsort: sort an Access Control List
addsev: define additional severities
addseverity: build a list of severity levels for an application for use with fmtmsg
altzone: date and time constant
asctime: convert date and time to string
asctime_r: convert date and time to string
atexit: add program termination routine
atof: convert string to double-precision number
atoi: convert ASCII to integer in base 10
atol: convert ASCII to long integer in base 10
atoll: convert ASCII to long long integer in base 10
bcmp: bit and byte string operations
bcopy: bit and byte string operations
bsd_signal: simplified signal facilities
bsearch: binary search a sorted table
bstring: bcopy, bcmp, bzero: bit and byte string operations
bzero: bit and byte string operations
calloc: checking memory allocator
catclose: close a message catalogue
catgets: read a program message
catopen, catclose: open/close a message catalog
cfgetispeed: general terminal interface
cfgetospeed: general terminal interface
cfsetispeed: general terminal interface
cfsetospeed: general terminal interface
clock: report CPU time used
closedir: close named directory stream
confstr: obtain configurable string values
conv: toupper, tolower, _toupper, _tolower, toascii: translate characters
ctime: convert date and time to string
ctime, ctime_r, localtime, localtime_r, gmtime, gmtime_r, asctime, asctime_r, tzset, timezone, altzone, daylight, tzname: convert date and time to string
ctime_r: convert date and time to string
ctype: character handling
daylight: date and time constant
dbm_clearerr: clear the error condition of a database
dbm_close: close a database
dbm_delete: delete a record and its key from a database
dbm_error: return the error condition of a database
dbm_fetch: write a record to a database
dbm_firstkey: return the first key in a database
dbm_nextkey: return the next key in a database
dbm_open: open a database
dbm_store: add a record to a database
difftime: compute the difference between two calendar times
directory: opendir, readdir, readdir64, readdir_r, readdir64_r, telldir, seekdir, rewinddir, closedir: directory operations
div, ldiv, lldiv: compute the quotient and remainder
dladdr: translate address to symbolic information
dlclose: close a shared object
dlerror: get diagnostic information
dlopen: open a shared object
dlsym: get the address of a symbol in shared object
drand48, erand48, lrand48, nrand48, mrand48, jrand48, srand48, seed48, lcong48: generate uniformly distributed pseudo-random numbers
dup2: duplicate an open file descriptor
ecvt: convert floating-point number to string
ecvt, ecvtl, fcvt, fcvtl, gcvt, gcvtl: convert floating-point number to string
ecvtl: convert floating-point number to string
edata: first address above initialized data region
end, etext, edata: last locations in program
endgrent: close the group file
endpwent: close password file
endspent: close the shadow password file
erand48: generate uniformly distributed pseudo-random numbers
etext: first address above program text
fattach: attach STREAMS-based file descriptor to file system object
fcvt: convert floating-point number to string
fcvtl: convert floating-point number to string
FD_CLR: remove from descriptor set
fdetach: detach a name from a STREAMS-based file descriptor
FD_ISSET: query descriptor set
FD_SET: add to descriptor set
FD_ZERO: initialize a null descriptor set
ffs: find first set bit
fgetgrent: return pointer to next group structure in stream
fgetgrent_r: fill in group structure from next in stream
fgetpos: stores current value of file position indicator for a stream
fgetpos64: stores current value of file position indicator for a stream (supports large files)
fgetpwent: return pointer to next password structure in stream
fgetpwent_r: fill in password structure from next in stream
fgetspent: return pointer to shadow password entry from next in stream
fgetspent_r: fill in shadow password entry from next in stream
fgetws: get a wchar_t string from a stream
fmtmsg: display a message on stderr or system console
fnmatch, _fnmcomp, _fnmexec, _fnmfree: match filename against pattern
fpgetround, fpsetround, fpgetmask, fpsetmask, fpgetsticky, fpsetsticky: IEEE floating-point environment control
free: checking memory allocator
frexp: manipulate floating-point numbers
frexpf: manipulate floating-point numbers
frexp, frexpf, frexpl, ilogb, ilogbf, ilogbl, ldexp, ldexpf, ldexpl, logb, logbf, logbl, modf, modff, modfl, nextafter, nextafterf, nextafterl, scalb, scalbf, scalbl: manipulate parts of floating-point numbers
frexpl: manipulate floating-point numbers
fsetpos: set position of next input/output operation on a stream
fsetpos64: set position of next input/output operation on a stream (supports large files)
fsetpos, fsetpos64, fgetpos, fgetpos64: reposition a file pointer in a stream
ftime: get date and time
ftok: standard interprocess communication package
ftw: walk a file tree
ftw64: walk a file tree (supports large files)
ftw, ftw64, nftw, nftw64: walk a file tree
gcvt: convert floating-point number to string
gcvtl: convert floating-point number to string
getcwd: get pathname of current working directory
getdate: convert user format date and time
getdtablesize: get file descriptor table size
getenv: return value for environment name
getgrent: return pointer to group entry
getgrent, getgrent_r, getgrgid, getgrgid_r, getgrnam, getgrnam_r, setgrent, endgrent, fgetgrent, fgetgrent_r: manipulate group file entry
getgrent_r: fill in group structure from next entry
getgrgid: return pointer to group entry matching gid
getgrgid_r: fill in group entry matching gid
getgrnam: return pointer to group entry matching name
getgrnam_r: fill in group entry matching name
gethostid: get an identifier for the current host
gethostname: get name of current host
gethostname, sethostname: get or set name of current host
getitimer: get value of interval timer
getlogin, getlogin_r: get login name
getopt: getopt, optarg, optind, opterr, optopt: get option letter from argument vector
getpagesize: get system page size
getpass: read a password
getpass_r: read a password
getpriority: get program scheduling priority
getpriority, setpriority: get or set program scheduling priority
getpwent: return pointer to password entry
getpwent, getpwent_r, getpwuid, getpwuid_r, getpwnam, getpwnam_r, setpwent, endpwent, fgetpwent, fgetpwent_r: manipulate password file
getpwent_r: fill in password structure from next entry
getpwnam: return pointer to password entry matching login name
getpwnam_r: fill in password entry matching login name
getpwuid: return pointer to password entry matching uid
getpwuid_r: fill in password entry matching uid
getrusage: get information about resource utilization
getspent: return pointer to next shadow password entry
getspent, getspent_r, getspnam, getspnam_r, setspent, endspent, fgetspent, fgetspent_r: manipulate shadow password file
getspent_r: fill in spwd structure from next shadow password entry
getspnam: return pointer to shadow password file entry matching name
getspnam_r: fill in shadow password file entry matching name
getsubopt: parse suboptions from a string
gettxt: retrieve a text string
getwd: get current working directory pathname
getwidth: get information on supplementary code sets
glob, globfree: generate pathnames matching a pattern
gmtime: convert date and time to string
gmtime_r: convert date and time to string
grantpt: grant access to the slave pseudo-terminal device
hcreate: manage hash search tables
hdestroy: manage hash search tables
hsearch, hcreate, hdestroy: manage hash search tables
iconv: codeset conversion function
iconv_close: code conversion deallocation function
iconv_open: code conversion allocation function
ilogb: manipulate floating-point numbers
ilogbf: manipulate floating-point numbers
ilogbl: manipulate floating-point numbers
index: string operations
initgroups: initialize the supplementary group access list
initstate: initialize a state array
insque, remque: insert/remove element from a queue
isalnum: test for alphanumeric character
isalpha: test for alphabetic character
isascii: test for ASCII character
isastream: test a file descriptor
isatty: determine if a file descriptor is a terminal device
isblank: test for blank character
iscntrl: test for control character
isdigit: test for digit character
isgraph: test for printable character except space
islower: test for lowercase character
isnan, isnand, isnanf, finite, fpclass, unordered: determine type of floating-point number
isprint: test for printable character
ispunct: test for punctuation character
isspace: test for space character
isupper: test for uppercase character
iswalnum: test wide characters for alpha or digit class
iswalpha: test wide characters for alpha class
iswcntrl: test wide characters for cntrl class
iswctype, wctype: test wide characters for a particular class
iswdigit: test wide characters for digit class
iswgraph: test wide characters for graph class
iswlower: test wide characters for lower class
iswprint: test wide characters for print class
iswpunct: test wide characters for punct class
iswspace: test wide characters for space class
iswupper: test wide characters for upper class
iswxdigit: test wide characters for xdigit class
isxdigit: test for hexadecimal digit character
jrand48: generate uniformly distributed pseudo-random numbers
killpg: send signal to a process group
l3tol, ltol3: convert between 3-byte integers and long integers
l64a: convert between long integer and base-64 ASCII string
l64a_r: convert between long integer and base-64 ASCII string
labs: return integer absolute value
lckpwdf: lock password file
lcong48: generate uniformly distributed pseudo-random numbers
ldexp: manipulate floating-point numbers
ldexpf: manipulate floating-point numbers
ldexpl: manipulate floating-point numbers
ldiv: compute the quotient and remainder
lfind: linear search and update
lfmt, vlfmt: display error message in standard format and pass to logging and monitoring services
llabs: return integer absolute value
lldiv: compute the quotient and remainder
localeconv: get numeric formatting information
localtime: convert date and time to string
localtime_r: convert date and time to string
lockf: record locking on files
lockf64: record locking on files (supports large files)
lockf, lockf64: record locking on files
logb: manipulate floating-point numbers
logbf: manipulate floating-point numbers
logbl: manipulate floating-point numbers
_longjmp: non-local goto
longjmp: non-local goto
lrand48: generate uniformly distributed pseudo-random numbers
lsearch, lfind: linear search and update
makecontext: modify user context
makedev, major, minor: manage a device number
mallinfo: checking memory allocator
malloc, calloc, free, realloc, memalign, valloc, mallinfo: checking memory allocator
mbchar: mbtowc, wctomb, mblen, mbrtowc, wcrtomb, mbrlen: multibyte character handling
mblen: multibyte character handling
mbrlen: multibyte character handling
mbrtowc: multibyte character handling
mbsinit: test for initial multibyte conversion state
mbsrtowcs: multibyte string functions
mbstowcs: multibyte string functions
mbstring: mbstowcs, wcstombs, mbsrtowcs, wcsrtombs: multibyte string functions
mbtowc: multibyte character handling
memalign: checking memory allocator
memccpy: memory operations
memchr: memory operations
memcmp: memory operations
memcpy: memory operations
memmove: memory operations
memory: memccpy, memchr, memcmp, memcpy, memmove, memset: memory operations
memset: memory operations
mkfifo: create a new FIFO
mkstemp: make a unique file name
mktemp: make a unique file name
mktime: converts a tm structure to a calendar time
mlock: lock pages in memory
mlockall: lock address space
modf: manipulate floating-point numbers
modff: manipulate floating-point numbers
modfl: manipulate floating-point numbers
monitor: prepare execution profile
mrand48: generate uniformly distributed pseudo-random numbers
msync: synchronize memory with physical storage
munlock: unlock pages in memory
munlockall: unlock address space
nap: suspend execution for a short interval
ndbm: dbm_clearerr, dbm_close, dbm_delete, dbm_error, dbm_fetch, dbm_firstkey, dbm_nextkey, dbm_open, dbm_store: database subroutines
nextafter: manipulate floating-point numbers
nextafterf: manipulate floating-point numbers
nextafterl: manipulate floating-point numbers
nftw: walk a file tree, takes defining flags
nftw64: walk a file tree, takes defining flags (supports large files)
nl_langinfo: language information
nrand48: generate uniformly distributed pseudo-random numbers
offsetof: offset of structure member
opendir: open a directory
optarg: pointer to start of option argument
opterr: disable getopt error message
optind: index of the next option argument
optopt: value of character that caused getopt error
perror: print system error messages
pfmt, vpfmt: display error message in standard format
procprivl: add, remove, count, or put privileges associated with the calling process
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
putws: put a wchar_t string on a stream
qsort: quicker sort
raise: send signal to program
rand: simple random-number generator
random: return psuedo-random number
random: initstate, random, setstate, srandom: pseudorandom number functions
rand_r: simple random-number generator
rand, rand_r, srand: simple random-number generator
rbt_delete: balanced binary tree operations
rbt_find: balanced binary tree operations
rbt_free: balanced binary tree operations
rbt_init: balanced binary tree operations
rbt_insert: balanced binary tree operations
rbtree: rbt_delete, rbt_find, rbt_free, rbt_init, rbt_insert, rbt_walk: manage balanced binary tree
rbt_walk: balanced binary tree operations
readdir: return pointer to next open directory
readdir64: return pointer to next open directory (supports large files)
readdir64_r: return pointer to next open directory (supports large files)
readdir_r: return pointer to next open directory
realloc: checking memory allocator
realpath: returns the real file name
re_comp: compile regular expression
re_comp, re_exec: regular expression handler
re_exec: compare regular expressions
regcmp: compile regular expression
regcmp, regex: regular expression handler
regcomp, regexec, regerror, regfree: regular expression matching
regex: compare regular expressions
remove: remove file
remque: remove element from a queue
rewinddir: reset position of named directory stream
rindex: string operations
scalb: manipulate floating-point numbers
scalbf: manipulate floating-point numbers
scalbl: manipulate floating-point numbers
seed48: generate uniformly distributed pseudo-random numbers
seekdir: set position of next read on directory stream
select, FD_CLR, FD_ISSET, FD_SET, FD_ZERO: synchronous I/O multiplexing
setcat: define default catalog
setgrent: rewind the group file
sethostname: set name of current host
setitimer: set value of interval timer
_setjmp: non-local goto
setjmp: non-local goto
setlabel: define the label for pfmt
setlocale: modify and query a program's locale
setpriority: set program scheduling priority
setpwent: rewind password file for further searches
setregid: set real and effective group IDs
setreuid: set real and effective user IDs
setspent: rewind shadow password file for repeated searches
setstate: switch between state arrays
sigaddset: add to signal set
sigdelset: delete from signal set
sigemptyset: initialize empty signal set
sigfillset: initialize signal set to all signals
siginterrupt: allow signals to interrupt system calls
sigismember: query signal set
siglongjmp: a non-local goto with signal state
sigsetjmp: a non-local goto with signal state
sigsetops: sigemptyset, sigfillset, sigaddset, sigdelset, sigismember: manipulate sets of signals
sleep: suspend execution for interval
srand: simple random-number generator
srand48: generate uniformly distributed pseudo-random numbers
srandom: initialize the current state array
stdipc: ftok: standard interprocess communication package
strcasecmp: string operations
strcasecmp, strncasecmp: case-insensitive string comparisons
strcat: append copy of one string to another
strchr: return pointer to first (last) occurrence of c
strcmp: compare one string to another
strcoll: string collation
strcpy: copy one string to another
strcspn: return length of initial segment of string1 of characters from (not from) string2
strdup: return pointer to new duplicate string
strerror: get error message string
strfmon: convert monetary value to string
strftime, cftime, ascftime: convert date and time to string
string: string operations
strlen: return number of characters in string
strncasecmp: string operations
strncat: append n characters of one string to another
strncmp: compare n characters of one string to another
strncpy: copy n characters of one string to another
strpbrk: return pointer to first occurrence in string1 of any character in string2
strptime: date and time conversion
strrchr: return pointer to first (last) occurrence of c
strspn: return length of initial segment of string1 of characters from (not from) string2
strstr: locate first occurrence in string1 of sequence from string2
strtod, strtold, atof: convert string to double-precision number
strtok: return pointer of string token
strtok_r: return pointer of string token
strtold: convert string to double-precision number
strtoll: convert string to long long integer
strtol, strtoll, strtoul, strtoull, atol, atoll, atoi: convert string to integer
strtoul: convert string to unsigned long integer
strtoull: convert string to unsigned long long integer
strxfrm: string transformation
swab: swap bytes
swapcontext: saves and resets current context
sysconf: get configurable system variables
tcdrain: general terminal interface
tcflow: general terminal interface
tcflush: general terminal interface
tcgetattr: general terminal interface
tcgetpgrp: general terminal interface
tcgetsid: general terminal interface
tcgetspeed, tcsetspeed: get and set baud rate
tcsendbreak: general terminal interface
tcsetattr: general terminal interface
tcsetpgrp: set terminal foreground process group ID
tcsetpgrp: general terminal interface
tcsetspeed: get and set baud rate
tdelete: manage binary search trees
telldir: return current location of named directory stream
termios: tcgetattr, tcsetattr, tcsendbreak, tcdrain, tcflush, tcflow, cfgetospeed, cfgetispeed, cfsetispeed, cfsetospeed, tcgetpgrp, tcsetpgrp, tcgetsid: general terminal interface
tfind: manage binary search trees
timezone: date and time constant
toascii: convert characters to 7-bit ASCII
_tolower: convert lower case characters to upper case
tolower: convert lower case characters to upper case
_toupper: convert upper case characters to lower case
toupper: convert upper case characters to lower case
towlower: translate characters
towupper: translate characters
tsearch, tfind, tdelete, twalk: manage binary search trees
ttyname: find name of a terminal
ttyname_r: find name of a terminal
ttyname, ttyname_r, isatty: find name of a terminal
ttyslot: find the slot in the utmp file of the current user
twalk: manage binary search trees
tzname: date and time constant
tzset: convert date and time to string
ualarm: set the interval timer
ulckpwdf: unlock password file
unlockpt: unlock a pseudo-terminal master/slave pair
usleep: suspend process for interval in microseconds
utimes: set file access and modification times
valloc: checking memory allocator
wait3: wait for child process to change state
wconv: towupper, towlower: translate characters
wcrtomb: multibyte character handling
wcscat: concatenate two wide character strings
wcschr: scan a wide character string
wcscmp: compare two wide character strings
wcscoll: wide character string comparison using collating information
wcscpy: copy a wide character string
wcscspn: get length of complementary wide substring
wcsftime: convert date and time to wide character string
wcslen: obtain wide character string length
wcsncat: concatenate two wide character strings with bound
wcsncmp: compare two wide character strings with bound
wcsncpy: copy a wide character string with bound
wcspbrk: scan a wide character string for wide characters
wcsrchr: reverse wide character string scan
wcsrtombs: multibyte string functions
wcsspn: obtain the length of a wide substring
wcsstr, wcswcs: find wide substring
wcstod, wcstof, wcstold: convert wide string to floating point value
wcstok: split a wide character string into tokens
wcstol: convert a wide character string to a long integer
wcstoll: convert a wide character string to a long long integer
wcstombs: multibyte string functions
wcstoul: convert a wide character string to an unsigned long integer
wcstoull: convert a wide character string to an unsigned long long integer
wcswcs: find wide substring
wcswidth: determine the number of column positions for a wide character string
wcsxfrm: wide character string transformation
wctob: wide character to byte conversion
wctomb: multibyte character handling
wctype: iswalpha, iswupper, iswlower, iswdigit, iswxdigit, iswalnum, iswgraph, iswspace, iswpunct, iswprint, iswcntrl: test wide characters for a specified class
wcwidth: determine the number of column positions for a wide character
wordexp, wordfree: perform word expansions