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abort(3)
cause abnormal program termination
abs(3)
integer absolute value function
acos(3)
arc cosine function
acosh(3)
inverse hyperbolic cosine function
alarm(3)
set signal timer alarm
alloca(3)
memory allocator
asctime(3), ctime(3), difftime(3), gmtime(3), localtime(3), mktime(3)
transform binary date and time value to ASCII
asin(3)
arc sine function
asinh(3)
inverse hyperbolic sine function
assert(3)
expression verification macro
atan(3)
arc tangent function of one variable
atan2(3)
arc tangent function of two variables
atanh(3)
inverse hyperbolic tangent function
atexit(3)
register a function to be called on exit
atof(3)
convert ASCII string to double
atoi(3)
convert ASCII string to integer
atol(3)
convert ASCII string to long integer
bcmp(3)
compare byte string
bcmp(3), bcopy(3), bzero(3), memccpy(3), memchr(3), memcmp(3), memcpy(3), memmove(3), memset(3)
byte string operations
bcopy(3)
copy byte string
bindresvport(3)
bind a socket to a privileged IP port
bitstring(3), bit_alloc(3)
bit_clear, bit_decl, bit_ffs, bit_nclear, bit_nset, bit_set, bitstr_size, bit_test bit-string manipulation macros
bsearch(3)
binary search of a sorted table
btree(3)
btree database access method
bzero(3)
write zeroes to a byte string
calloc(3)
allocate clean memory (zero initialized space)
cbrt(3), sqrt(3)
cube root and square root functions
ceil(3)
smallest integral value not greater than x
cfgetispeed(3), cfsetispeed(3), cfgetospeed(3), cfsetospeed(3), cfsetspeed(3), cfmakeraw(3), tcgetattr(3), tcsetattr(3)
manipulating the termios structure
cgetent(3), cgetset(3), cgetmatch(3), cgetcap(3), cgetnum(3), cgetstr(3), cgetustr(3), cgetfirst(3), cgetnext(3), cgetclose(3)
capability database access routines
clearerr(3), feof(3), ferror(3), fileno(3)
check and reset stream status
clock(3)
determine processor time used
config_open(3), config_close(3), config_next(3), config_skip(3)
read config files
copysign(3), drem(3), finite(3), logb(3), scalb copysign(3), remainder(3)
exponent manipulations
cos(3)
cosine function
cosh(3)
hyperbolic cosine function
crypt(3), setkey(3), encrypt(3), des_setkey(3), des_cipher(3)
DES encryption
ctermid(3)
generate terminal pathname
curses(3)
screen functions with ``optimal'' cursor motion
daemon(3)
become a daemon process
dbopen(3)
database access methods
div(3)
return quotient and remainder from division
drand48(3), erand48(3), lrand48(3), nrand48(3), mrand48(3), jrand48(3), srand48(3), seed48(3), lcong48(3)
pseudo random number generators and initialization routines
end(3), etext(3), edata(3)
end boundaries of image segments
erf(3), erfc(3)
error function operators
err(3), verr(3), errx(3), verrx(3), warn(3), vwarn(3), warnx(3), vwarnx(3)
formatted error messages
execl(3), execlp(3), execle(3), exect(3), execv(3), execvp(3)
execute a file
exit(3)
perform normal program termination
exp(3), expm1(3), log(3), log10(3), log1p(3), pow(3)
exponential, logarithm, power functions
fabs(3)
floating-point absolute value function
fclose(3)
close a stream
fflush(3), fpurge(3)
flush a stream
ffs(3)
find first bit set in a bit string
fgetc(3), getc(3), getchar(3), getw(3)
get next character or word from input stream
fgetline(3)
get a line from a stream
fgetpos(3), fseek(3), fsetpos(3), ftell(3), rewind(3)
reposition a stream
fgets(3), gets(3)
get a line from a stream
floor(3)
largest integral value not greater than x
fmod(3)
floating-point remainder function
fnmatch(3)
match filename or pathname
fopen(3), fdopen(3), freopen(3)
stream open functions
fpgetround(3), fpsetround(3), fpgetmask(3), fpsetmask(3), fpgetsticky(3), fpresetsticky(3)
IEEE floating point interface
fputc(3), putc(3), putchar(3), putw(3)
output a character or word to a stream
fputs(3), puts(3)
output a line to a stream
fread(3), fwrite(3)
binary stream input/output
free(3)
free up memory allocated with malloc, calloc or realloc
frexp(3)
convert floating-point number to fractional and integral components
fts(3)
traverse a file hierarchy
funopen(3), fropen(3), fwopen(3)
open a stream
gamma(3), lgamma gamma(3)
log gamma function, gamma function
getdiskbyname(3)
get generic disk description by its name
getenv(3), putenv(3), setenv(3), unsetenv(3)
environment variable functions
getfsent(3), getfsspec(3), getfsfile(3), setfsent(3), endfsent(3)
get file system descriptor file entry
getgrent(3), getgrnam(3), getgrgid(3), setgroupent(3)
setgrent, endgrent group database operations
gethostbyname(3), gethostbyaddr(3), gethostent(3), sethostent(3), endhostent(3), herror(3)
get network host entry
getloadavg(3)
get system load averages
getmntinfo(3)
get information about mounted file systems
getmode(3), setmode(3)
modify mode bits
getnetent(3), getnetbyaddr(3), getnetbyname(3), setnetent(3), endnetent(3)
get network entry
getopt(3)
get option letter from argv
getpass(3)
get a password
getprotoent(3), getprotobynumber(3), getprotobyname(3), setprotoent(3), endprotoent(3)
get protocol entry
getpwent(3), getpwnam(3), getpwuid(3), setpassent(3), setpwent(3), endpwent(3)
password database operations
getrpcent(3), getrpcbyname(3), getrpcbynumber(3)
get RPC entry
getrpcport(3)
get RPC port number
getservent(3), getservbyport(3), getservbyname(3), setservent(3), endservent(3)
get service entry
getsubopt(3)
get sub options from an argument
getttyent(3), getttynam(3), setttyent(3), endttyent(3)
get ttys file entry
getusershell(3), setusershell(3), endusershell(3)
get legal user shells
getwd(3)
get working directory pathname
glob(3), globfree(3)
generate pathnames matching a pattern
hash(3)
hash database access method
htonl(3), htons(3), ntohl(3), ntohs(3)
convert values between host and network byte order
hypot(3), cabs(3)
euclidean distance and complex absolute value functions
index(3)
locate character in string
inet_aton(3), inet_addr(3), inet_network(3), inet_ntoa(3), inet_makeaddr(3), inet_lnaof(3), inet_netof(3)
Internet address manipulation routines
infnan(3)
signals invalid floating-point operations on a VAX (temporary)
initgroups(3)
initialize group access list
insque(3), remque(3)
insert/remove element from a circular queue
intro(3)
introduction to the C libraries
isalnum(3)
alphanumeric character test
isalpha(3)
alphabetic character test
isalpha(3), isupper(3), islower(3), isdigit(3), isxdigit(3), isalnum(3), isspace(3), ispunct(3), isprint(3), isgraph(3), iscntrl(3), isascii(3), toupper(3), tolower(3), toascii(3)
character classification macros
iscntrl(3)
control character test
isdigit(3)
decimal-digit character test
isgraph(3)
printing character test (space character exculsive)
isinf(3)
isnan test for infinity or not-a-number (*(Na)
islower(3)
lower-case character test
isprint(3)
printing character test (space character inclusive)
ispunct(3)
punctuation character test
isspace(3)
white-space character test
isupper(3)
upper-case character test
isxdigit(3)
hexadecimal-digit character test
j0(3), j1(3), jn(3), y0(3), y1(3), yn(3)
bessel functions of first and second kind
labs(3)
return the absolute value of a long integer
ldexp(3)
multiply floating-point number by integral power of 2
ldiv(3)
return quotient and remainder from division
lgamma(3), lgamma gamma(3)
log gamma function, gamma function
malloc(3)
general memory allocation function
malloc(3), free(3), realloc(3), calloc(3), alloca(3)
general memory allocation operations
math(3)
introduction to mathematical library functions
memchr(3)
locate byte in byte string
memcmp(3)
compare byte string
memcpy(3)
copy byte string
memmove(3)
copy byte string
memset(3)
write a byte to byte string
mktemp(3)
make temporary file name (unique)
modf(3)
extract signed integral and fractional values from floating-point number
nice(3)
set program scheduling priority
nlist(3)
retrieve symbol table name list from an executable file
ns_addr(3), ns_ntoa(3)
Xerox NS Ns (tm) address conversion routines
opendir(3), readdir(3), telldir(3), seekdir(3), rewinddir(3), closedir(3), dirfd(3)
directory operations
osname(3), _osname(3)
get name of running operating system .br _osnamever get name and version of running operating system
osnamever(3), _osname(3)
get name of running operating system .br _osnamever get name and version of running operating system
pause(3)
stop until signal
perror(3), strerror(3), sys_errlist(3), sys_nerr(3)
system error messages
popen(3), pclose(3)
process I/O
printf(3), fprintf(3), sprintf(3), snprintf(3), vprintf(3), vfprintf(3), vsprintf(3), vsnprintf(3)
formatted output conversion
psignal(3), sys_siglist(3)
system signal messages
pwcache(3)
cache password and group entries
qsort(3), heapsort(3)
sort functions
queue(3), LIST_ENTRY(3), LIST_HEAD(3), LIST_INIT(3), LIST_INSERT_AFTER(3), LIST_INSERT_HEAD(3), LIST_REMOVE(3), TAILQ_ENTRY(3), TAILQ_HEAD(3), TAILQ_INIT(3), TAILQ_INSERT_AFTER(3), TAILQ_INSERT_HEAD(3), TAILQ_INSERT_TAIL(3), TAILQ_REMOVE(3), CIRCLEQ_ENTRY(3), CIRCLEQ_HEAD(3), CIRCLEQ_INIT(3), CIRCLEQ_INSERT_AFTER(3), CIRCLEQ_INSERT_BEFORE(3), CIRCLEQ_INSERT_HEAD(3), CIRCLEQ_INSERT_TAIL(3), CIRCLEQ_REMOVE(3)
implementations of lists, tail queues, and circular queues
radixsort(3)
radix sort
raise(3)
send a signal to the current process
rand(3), srand(3)
bad random number generator
random(3), srandom(3), initstate(3), setstate(3)
better random number generator; routines for changing generators
rcmd(3), rresvport(3), ruserok(3)
routines for returning a stream to a remote command
realloc(3)
reallocation of memory function
recno(3)
record number database access method
regcomp(3), regexec(3), regerror(3), regfree(3)
regular-expression library
remove(3)
remove directory entry
res_query(3), res_search(3), res_mkquery(3), res_send(3), res_init(3), dn_comp(3), dn_expand(3)
resolver routines
rindex(3)
locate character in string
rint(3)
and round-to-closest integer functions
rpc(3)
library routines for remote procedure calls
scandir(3), alphasort(3)
scan a directory
scanf(3), fscanf(3), sscanf(3), vscanf(3), vsscanf(3), vfscanf(3)
input format conversion
setbuf(3), setbuffer(3), setlinebuf(3), setvbuf(3)
stream buffering operations
setuid(3), seteuid(3), setruid(3), setgid(3), setegid(3), setrgid(3)
set user and group ID
siginterrupt(3)
allow signals to interrupt system calls
signal(3)
simplified software signal facilities
sigsetjmp(3)
siglongjmp, setjmp, longjmp, _setjmp, _longjmp, longjmperror non-local jumps
sigsetops(3), sigemptyset(3), sigfillset(3), sigaddset(3), sigdelset(3), sigismember(3)
manipulate signal masks
sin(3)
sine function
sinh(3)
hyperbolic sine function
sleep(3)
suspend process execution for interval of seconds
stdarg(3)
variable argument lists
stdio(3)
standard input/output library functions
strcasecmp(3)
compare strings, ignoring case
strcat(3)
concatenate strings
strcat(3), strncat(3), strchr(3), strrchr(3), strcmp(3), strncmp(3), strcasecmp(3), strncasecmp(3), strcpy(3), strncpy(3), strerror(3), strlen(3), strpbrk(3), strsep(3), strspn(3), strcspn(3), strstr(3), strtok(3), index(3), rindex(3)
string specific functions
strchr(3)
locate character in string
strcmp(3)
compare strings
strcoll(3)
compare strings according to current collation
strcpy(3)
copy strings
strcspn(3)
span the complement of a string
strdup(3)
save a copy of a string
strftime(3)
format date and time
strlen(3)
find length of string
strmode(3)
convert inode status information into a symbolic string
strpbrk(3)
locate multiple characters in string
strrchr(3)
locate character in string
strsep(3)
separate strings
strspn(3)
span a string
strstr(3)
locate a substring in a string
strtod(3)
convert ASCII string to double
strtok(3), strsep(3)
string token operations
strtol(3)
convert string value to a long integer
strtoul(3)
convert a string to an unsigned long integer
strxfrm(3)
transform a string under locale
swab(3)
swap adjacent bytes
syslog(3), vsyslog(3), openlog(3), closelog(3), setlogmask(3)
control system log
system(3)
pass a command to the shell
tan(3)
tangent function
tanh(3)
hyperbolic tangent function
tcgetpgrp(3)
get foreground process group ID
tcsendbreak(3), tcdrain(3), tcflush(3), tcflow(3)
line control functions
tcsetpgrp(3)
set foreground process group ID
tempnam(3), tmpfile(3), tmpnam(3)
temporary file routines
tgetent(3), tgetnum(3), tgetflag(3), tgetstr(3), tgoto(3), tputs(3)
terminal independent operation routines
time(3)
get time of day
times(3)
process times
timezone(3)
return the timezone abbreviation
tolower(3)
upper case to lower case letter conversion
toupper(3)
lower case to upper case letter conversion
ttyname(3), isatty(3), ttyslot(3)
get name of associated terminal (tty) from file descriptor
tzset(3), tzsetwall(3)
initialize time conversion information
ualarm(3)
schedule signal after specified time
ungetc(3)
un-get character from input stream
unvis(3), strunvis(3)
decode a visual representation of characters
usleep(3)
suspend execution for interval of microseconds
utime(3)
set file times
valloc(3)
aligned memory allocation function
vis(3)
visually encode characters
xdr(3)
library routines for external data representation
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