section 3p · Library functions 📚

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

A

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

B

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

C

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

D

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

E

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

F

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