abort(3) abort: generate a fault.
abs(3) abs: integer absolute value.
alarm(3c) alarm: schedule signal after specified time.
asinh(3m) asinh, acosh, atanh: inverse hyperbolic functions.
assert(3) assert: program verification.
atof(3) atof, atoi, atol: convert ASCII to numbers.
bstring(3) bcopy, bcmp, bzero, ffs: bit and byte string operations.
byteorder(3n) htonl, htons, ntohl, ntohs: convert values between host and network byte order.
crypt(3) crypt, setkey, encrypt: DES encryption.
ctime(3) ctime, localtime, gmtime, asctime, timezone: convert date and time to ASCII.
ctype(3) isalpha, isupper, islower, isdigit, isxdigit, isalnum, isspace, ispunct, isprint, isgraph, iscntrl, isascii, toupper, tolower, toascii: character classification macros.
curses(3x) curses: screen functions with ``optimal'' cursor motion.
dbm(3x) dbminit, fetch, store, delete, firstkey, nextkey: data base subroutines.
directory(3) opendir, readdir, telldir, seekdir, rewinddir, closedir: directory operations.
ecvt(3) ecvt, fcvt, gcvt: output conversion.
end(3) end, etext, edata: last locations in program.
erf(3m) erf, erfc: error functions.
execl(3) execl, execv, execle, execlp, execvp, exec, execve, exect, environ: execute a file.
exit(3) exit: terminate a process after flushing any pending output.
exp(3m) exp, expm1, log, log10, log1p, pow: exponential, logarithm, power.
fclose(3s) fclose, fflush: close or flush a stream.
ferror(3s) ferror, feof, clearerr, fileno: stream status inquiries.
floor(3m) fabs, floor, ceil, rint: absolute value, floor, ceiling, and round-to-nearest functions.
fopen(3s) fopen, freopen, fdopen: open a stream.
fread(3s) fread, fwrite: buffered binary input/output.
frexp(3) frexp, ldexp, modf: split into mantissa and exponent.
fseek(3s) fseek, ftell, rewind: reposition a stream.
getc(3s) getc, getchar, fgetc, getw: get character or word from stream.
getdisk(3) getdiskbyname: get disk description by its name.
getenv(3) getenv: value for environment name.
getfsent(3) getfsent, getfsspec, getfsfile, getfstype, setfsent, endfsent: get file system descriptor file entry.
getgrent(3) getgrent, getgrgid, getgrnam, setgrent, endgrent: get group file entry.
gethostbyname(3n) gethostbyname, gethostbyaddr, gethostent, sethostent, endhostent: get network host entry.
getlogin(3) getlogin: get login name.
getnetent(3n) getnetent, getnetbyaddr, getnetbyname, setnetent, endnetent: get network entry.
getopt(3) getopt: get option letter from argv.
getpass(3) getpass: read a password.
getprotoent(3n) getprotoent, getprotobynumber, getprotobyname, setprotoent, endprotoent: get protocol entry.
getpw(3c) getpw: get name from uid.
getpwent(3) getpwent, getpwuid, getpwnam, setpwent, endpwent, setpwfile: get password file entry.
gets(3s) gets, fgets: get a string from a stream.
getservent(3n) getservent, getservbyport, getservbyname, setservent, endservent: get service entry.
getttyent(3) getttyent, getttynam, setttyent, endttyent: get ttys file entry.
getusershell(3) getusershell, setusershell, endusershell: get legal user shells.
getwd(3) getwd: get current working directory pathname.
hypot(3m) hypot, cabs: Euclidean distance, complex absolute value.
ieee(3m) copysign, drem, finite, logb, scalb: copysign, remainder, exponent manipulations.
inet(3n) inet_addr, inet_network, inet_ntoa, inet_makeaddr, inet_lnaof, inet_netof: Internet address manipulation routines.
infnan(3m) infnan: signals invalid floating-point operations on a VAX (temporary).
initgroups(3) initgroups: initialize group access list.
insque(3) insque, remque: insert/remove element from a queue.
intro(3) intro: introduction to C library functions.
j0(3m) j0, j1, jn, y0, y1, yn: bessel functions.
lgamma(3m) lgamma: log gamma function.
lib2648(3x) lib2648: subroutines for the HP 2648 graphics terminal.
malloc(3) malloc, free, realloc, calloc, alloca: memory allocator.
math(3m) math: introduction to mathematical library functions.
mktemp(3) mktemp: make a unique file name.
monitor(3) monitor, monstartup, moncontrol: prepare execution profile.
mp(3x) madd, msub, mult, mdiv, pow, gcd, invert, rpow, msqrt, mcmp, move, min, omin, fmin, m_in, mout, omout, fmout, m_out, sdiv, itom: multiple precision integer arithmetic.
ndbm(3) dbm_open, dbm_close, dbm_fetch, dbm_store, dbm_delete, dbm_firstkey, dbm_nextkey, dbm_error, dbm_clearerr: data base subroutines.
nice(3c) nice: set program priority.
nlist(3) nlist: get entries from name list.
ns(3n) ns_addr, ns_ntoa: Xerox NS(tm)  address conversion routines.
pause(3c) pause: stop until signal.
perror(3) perror, sys_errlist, sys_nerr: system error messages.
plot(3x) plot: openpl, erase, label, line, circle, arc, move, cont, point, linemod, space, closepl: graphics interface.
popen(3) popen, pclose: initiate I/O to/from a process.
printf(3s) printf, fprintf, sprintf: formatted output conversion.
psignal(3) psignal, sys_siglist: system signal messages.
putc(3s) putc, putchar, fputc, putw: put character or word on a stream.
puts(3s) puts, fputs: put a string on a stream.
qsort(3) qsort: quicker sort.
rand(3c) rand, srand: random number generator.
random(3) random, srandom, initstate, setstate: better random number generator; routines for changing generators.
rcmd(3) rcmd, rresvport, ruserok: routines for returning a stream to a remote command.
regex(3) re_comp, re_exec: regular expression handler.
resolver(3) res_mkquery, res_send, res_init, dn_comp, dn_expand: resolver routines.
rexec(3) rexec: return stream to a remote command.
scandir(3) scandir, alphasort: scan a directory.
scanf(3s) scanf, fscanf, sscanf: formatted input conversion.
setbuf(3s) setbuf, setbuffer, setlinebuf: assign buffering to a stream.
setjmp(3) setjmp, longjmp: non-local goto.
setuid(3) setuid, seteuid, setruid, setgid, setegid, setrgid: set user and group ID.
siginterrupt(3) siginterrupt: allow signals to interrupt system calls.
signal(3c) signal: simplified software signal facilities.
sin(3m) sin, cos, tan, asin, acos, atan, atan2: trigonometric functions and their inverses.
sinh(3m) sinh, cosh, tanh: hyperbolic functions.
sleep(3) sleep: suspend execution for interval.
sqrt(3m) cbrt, sqrt: cube root, square root.
stdio(3s) stdio: standard buffered input/output package.
string(3) strcat, strncat, strcmp, strncmp, strcpy, strncpy, strlen, index, rindex: string operations.
stty(3c) stty, gtty: set and get terminal state (defunct).
swab(3) swab: swap bytes.
syslog(3) syslog, openlog, closelog, setlogmask: control system log.
system(3) system: issue a shell command.
termcap(3x) tgetent, tgetnum, tgetflag, tgetstr, tgoto, tputs: terminal independent operation routines.
time(3c) time, ftime: get date and time.
times(3c) times: get process times.
ttyname(3) ttyname, isatty, ttyslot: find name of a terminal.
ualarm(3) ualarm: schedule signal after specified time.
ungetc(3s) ungetc: push character back into input stream.
usleep(3) usleep: suspend execution for interval.
utime(3c) utime: set file times.
valloc(3c) valloc: aligned memory allocator.
varargs(3) varargs: variable argument list.
vlimit(3c) vlimit: control maximum system resource consumption.
vtimes(3c) vtimes: get information about resource utilization.