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_Exit(3posix)terminate a process✨
_longjmp(3posix)non-local goto✨
_tolower(3posix)transliterate uppercase characters to lowercase✨
_toupper(3posix)transliterate lowercase characters to uppercase✨

A

a64l(3posix)convert between a 32-bit integer and a radix-64 ASCII string✨
abort(3posix)generate an abnormal process abort✨
abs(3posix)return an integer absolute value✨
accept(3posix)accept a new connection on a socket✨
access(3posix)determine accessibility of a file descriptor✨
acos(3posix)arc cosine functions✨
acosh(3posix)inverse hyperbolic cosine functions✨
acosl(3posix)arc cosine functions✨
aio.h(7posix)asynchronous input and output✨
aio_cancel(3posix)cancel an asynchronous I/O request✨
aio_error(3posix)retrieve errors status for an asynchronous I/O operation✨
aio_fsync(3posix)asynchronous file synchronization✨
aio_read(3posix)asynchronous read from a file✨
aio_return(3posix)retrieve return status of an asynchronous I/O operation✨
aio_suspend(3posix)wait for an asynchronous I/O request✨
aio_write(3posix)asynchronous write to a file✨
alarm(3posix)schedule an alarm signal✨
alphasort(3posix)scan a directory✨
arpa_inet.h(7posix)definitions for internet operations✨
asctime(3posix)convert date and time to a string✨
asin(3posix)arc sine function✨
asinh(3posix)inverse hyperbolic sine functions✨
asinl(3posix)arc sine function✨
assert(3posix)insert program diagnostics✨
assert.h(7posix)verify program assertion✨
atan(3posix)arc tangent function✨
atan2(3posix)arc tangent functions✨
atanf(3posix)arc tangent function✨
atanh(3posix)inverse hyperbolic tangent functions✨
atanl(3posix)arc tangent function✨
atexit(3posix)register a function to run at process termination✨
atof(3posix)convert a string to a double-precision number✨
atoi(3posix)convert a string to an integer✨
atol(3posix)convert a string to a long integer✨

B

basename(3posix)return the last component of a pathname✨
bind(3posix)bind a name to a socket✨
bsearch(3posix)binary search a sorted table✨
btowc(3posix)single byte to wide character conversion✨

C

cabs(3posix)return a complex absolute value✨
cacos(3posix)complex arc cosine functions✨
cacosh(3posix)complex arc hyperbolic cosine functions✨
cacosl(3posix)complex arc cosine functions✨
calloc(3posix)a memory allocator✨
carg(3posix)complex argument functions✨
casin(3posix)complex arc sine functions✨
casinh(3posix)complex arc hyperbolic sine functions✨
casinl(3posix)complex arc sine functions✨
catan(3posix)complex arc tangent functions✨
catanh(3posix)complex arc hyperbolic tangent functions✨
catanl(3posix)complex arc tangent functions✨
catclose(3posix)close a message catalog descriptor✨
catgets(3posix)read a program message✨
catopen(3posix)open a message catalog✨
cbrt(3posix)cube root functions✨
ccos(3posix)complex cosine functions✨
ccosh(3posix)complex hyperbolic cosine functions✨
ccosl(3posix)complex cosine functions✨
ceil(3posix)ceiling value function✨
cexp(3posix)complex exponential functions✨
cfgetispeed(3posix)get input baud rate✨
cfgetospeed(3posix)get output baud rate✨
cfsetispeed(3posix)set input baud rate✨
cfsetospeed(3posix)set output baud rate✨
chdir(3posix)change working directory✨
chmod(3posix)change mode of a file✨
chown(3posix)change owner and group of a file✨
cimag(3posix)complex imaginary functions✨
clearerr(3posix)clear indicators on a stream✨
clock(3posix)report CPU time used✨
clock_getcpuclockid(3posix)access a process CPU-time clock (ADVANCED REALTIME)✨
clock_getres(3posix)clock and timer functions✨
clock_nanosleep(3posix)high resolution sleep with specifiable clock✨
clock_settime(3posix)clock and timer functions✨
clog(3posix)complex natural logarithm functions✨
close(3posix)close a file descriptor✨
closedir(3posix)close a directory stream✨
closelog(3posix)control system log✨
complex.h(7posix)complex arithmetic✨
confstr(3posix)get configurable variables✨
conj(3posix)complex conjugate functions✨
connect(3posix)connect a socket✨
copysign(3posix)number manipulation function✨
cos(3posix)cosine function✨
cosh(3posix)hyperbolic cosine functions✨
cosl(3posix)cosine function✨
cpio.h(7posix)cpio archive values✨
cpow(3posix)complex power functions✨
cproj(3posix)complex projection functions✨
creal(3posix)complex real functions✨
creat(3posix)create a new file or rewrite an existing one✨
crypt(3posix)string encoding function (CRYPT)✨
csin(3posix)complex sine functions✨
csinh(3posix)complex hyperbolic sine functions✨
csinl(3posix)complex sine functions✨
csqrt(3posix)complex square root functions✨
ctan(3posix)complex tangent functions✨
ctanh(3posix)complex hyperbolic tangent functions✨
ctanl(3posix)complex tangent functions✨
ctermid(3posix)generate a pathname for the controlling terminal✨
ctime(3posix)convert a time value to a date and time string✨
ctype.h(7posix)character types✨

D

daylight(3posix)daylight savings time flag✨
dbm_clearerr(3posix)database functions✨
difftime(3posix)compute the difference between two calendar time values✨
dirent.h(7posix)format of directory entries✨
dirfd(3posix)extract the file descriptor used by a DIR stream✨
dirname(3posix)report the parent directory name of a file pathname✨
div(3posix)compute the quotient and remainder of an integer division✨
dlclose(3posix)close a symbol table handle✨
dlerror(3posix)get diagnostic information✨
dlfcn.h(7posix)dynamic linking✨
dlopen(3posix)open a symbol table handle✨
dlsym(3posix)get the address of a symbol from a symbol table handle✨
dprintf(3posix)print formatted output✨
drand48(3posix)generate uniformly distributed pseudo-random numbers✨
dup(3posix)duplicate an open file descriptor✨
duplocale(3posix)duplicate a locale object✨

E

encrypt(3posix)encoding function (CRYPT)✨
endgrent(3posix)group database entry functions✨
endhostent(3posix)network host database functions✨
endnetent(3posix)network database functions✨
endprotoent(3posix)network protocol database functions✨
endpwent(3posix)user database functions✨
endservent(3posix)network services database functions✨
endutxent(3posix)user accounting database functions✨
environ(3posix)array of character pointers to the environment strings✨
erand48(3posix)generate uniformly distributed pseudo-random numbers✨
erf(3posix)error functions✨
erfc(3posix)complementary error functions✨
erff(3posix)error functions✨
errno(3posix)error return value✨
errno.h(7posix)system error numbers✨
exec(3posix)execute a file✨
exit(3posix)terminate a process✨
exp(3posix)exponential function✨
exp2(3posix)exponential base 2 functions✨
expm1(3posix)compute exponential functions✨

F

fabs(3posix)absolute value function✨
faccessat(3posix)determine accessibility of a file relative to directory file descriptor✨
fattach(3posix)attach a STREAMS-based file descriptor to a file in the file system name space (STREAMS)✨
fchdir(3posix)change working directory✨
fchmod(3posix)change mode of a file✨
fchmodat(3posix)change mode of a file relative to directory file descriptor✨
fchown(3posix)change owner and group of a file✨
fchownat(3posix)change owner and group of a file relative to directory file descriptor✨
fclose(3posix)close a stream✨
fcntl(3posix)file control✨
fcntl.h(7posix)file control options✨
FD_CLR(3posix)macros for synchronous I/O multiplexing✨
fdatasync(3posix)synchronize the data of a file (REALTIME)✨
fdetach(3posix)detach a name from a STREAMS-based file descriptor (STREAMS)✨
fdim(3posix)compute positive difference between two floating- point numbers✨
fdopen(3posix)associate a stream with a file descriptor✨
fdopendir(3posix)open directory associated with file descriptor✨
feclearexcept(3posix)clear floating-point exception✨
fegetenv(3posix)get and set current floating-point environment✨
fegetexceptflag(3posix)get and set floating-point status flags✨
fegetround(3posix)get and set current rounding direction✨
feholdexcept(3posix)save current floating-point environment✨
fenv.h(7posix)floating-point environment✨
feof(3posix)test end-of-file indicator on a stream✨
feraiseexcept(3posix)raise floating-point exception✨
ferror(3posix)test error indicator on a stream✨
fesetenv(3posix)set current floating-point environment✨
fesetexceptflag(3posix)set floating-point status flags✨
fesetround(3posix)set current rounding direction✨
fetestexcept(3posix)test floating-point exception flags✨
feupdateenv(3posix)update floating-point environment✨
fexecve(3posix)execute a file✨
fflush(3posix)flush a stream✨
ffs(3posix)find first set bit✨
fgetc(3posix)get a byte from a stream✨
fgetpos(3posix)get current file position information✨
fgets(3posix)get a string from a stream✨
fgetwc(3posix)get a wide-character code from a stream✨
fgetws(3posix)get a wide-character string from a stream✨
fileno(3posix)map a stream pointer to a file descriptor✨
float.h(7posix)floating types✨
flockfile(3posix)stdio locking functions✨
floor(3posix)floor function✨
fma(3posix)floating-point multiply-add✨
fmax(3posix)determine maximum numeric value of two floating- point numbers✨
fmemopen(3posix)open a memory buffer stream✨
fmin(3posix)determine minimum numeric value of two floating- point numbers✨
fmod(3posix)floating-point remainder value function✨
fmtmsg(3posix)display a message in the specified format on standard error and/or a system console✨
fmtmsg.h(7posix)message display structures✨
fnmatch(3posix)match a filename string or a pathname✨
fnmatch.h(7posix)filename-matching types✨
fopen(3posix)open a stream✨
fork(3posix)create a new process✨
fpathconf(3posix)get configurable pathname variables✨
fpclassify(3posix)classify real floating type✨
fprintf(3posix)print formatted output✨
fputc(3posix)put a byte on a stream✨
fputs(3posix)put a string on a stream✨