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8.177. POSIX

Provides access to standard POSIX 1003.1 identifiers: functions, classes, and constants. Can be use d to import one or multiple symbols:

use POSIX; # Import all symbols use POSIX qw(setsid); # Import one symbol use POSIX qw(:errno_h :fcntl_h); # Import sets of symbols

Functions listed as C-specific are not implemented.

Function	Description
_exit	Identical to C function _exit(2)
abort	Identical to C function abort(3)
abs	Identical to Perl's abs function
access	Determines accessibility of a file; returns undef on failure
acos	Identical to C function acos(3)
alarm	Identical to Perl's alarm function
asctime	Identical to C function asctime(3)
asin	Identical to C function asin(3)
assert	Similar to C macro assert(3)
atan	Identical to C function atan(3)
atan2	Identical to Perl's atan2 function
atexit	C-specific; use END {}
atof	C-specific
atoi	C-specific
atol	C-specific
bsearch	Not supplied
calloc	C-specific
ceil	Identical to C function ceil(3)
chdir	Identical to Perl's chdir function
chmod	Identical to Perl's chmod function
chown	Identical to Perl's chown function
clearerr	Uses method FileHandle::clearerr
clock	Identical to C function clock(3)
close	Closes a file; returns undef on failure
closedir	Identical to Perl's closedir function
cos	Identical to Perl's cos function
cosh	Identical to C function cosh(3)
creat	Creates a new file
ctermid	Generates pathname for the controlling terminal
ctime	Identical to C function ctime(3)
cuserid	Gets user's login name
difftime	Identical to C function difftime(3)
div	C-specific
dup	Similar to C function dup(2); returns undef on failure
dup2	Similar to C function dup2(2); returns undef on failure
errno	Returns the value of errno
execl	C-specific; use Perl's exec
execle	C-specific; use Perl's exec
execlp	C-specific; use Perl's exec
execv	C-specific; use Perl's exec
execve	C-specific; use Perl's exec
execvp	C-specific; use Perl's exec
exit	Identical to Perl's exit function
exp	Identical to Perl's exp function
fabs	Identical to Perl's abs function
fclose	Uses method FileHandle::close
fcntl	Identical to Perl's fcntl function
fdopen	Uses method FileHandle::new_from_fd
feof	Uses method FileHandle::eof
ferror	Uses method FileHandle::error
fflush	Uses method FileHandle::flush
fgetc	Uses method FileHandle::getc
fgetpos	Uses method FileHandle::getpos
fgets	Uses method FileHandle::gets
fileno	Uses method FileHandle::fileno
floor	Identical to C function floor(3)
fmod	Identical to C function fmod(3)
fopen	Uses method FileHandle::open
fork	Identical to Perl's fork function
fpathconf	Returns value of a configurable limit on a file or directory, or undef on failure
fprintf	C-specific; use Perl's printf function
fputc	C-specific; use Perl's print function
fputs	C-specific; use Perl's print function
fread	C-specific; use Perl's read function
free	C-specific
freopen	C-specific; use Perl's open function
frexp	Returns mantissa and exponent of a floating-point number
fscanf	C-specific; use <> and regular expressions
fseek	Uses method FileHandle::seek
fsetpos	Uses method FileHandle::setpos
fstat	Gets file status
ftell	Uses method FileHandle::tell
fwrite	C-specific; use Perl's print function
getc	Identical to Perl's etc function
getchar	Returns one character from STDIN
getcwd	Returns name of current working directory
getegid	Returns effective group ID (gid)
getenv	Returns value of the specified environment variable
geteuid	Returns the effective user ID (uid)
getgid	Returns the user's real group ID (gid)
getgrgid	Identical to Perl's getgrgid function
getgrnam	Identical to Perl's getgrnam function
getgroups	Returns IDs of the user's supplementary groups
getlogin	Identical to Perl's getlogin function
getpgrp	Identical to Perl's getpgrp function
getpid	Returns ID of the process (pid)
getppid	Identical to Perl's getppid function
getpwnam	Identical to Perl's getpwnam function
getpwuid	Identical to Perl's getpwuid function
gets	Returns one line from STDIN
getuid	Returns user's ID (uid)
gmtime	Identical to Perl's gmtime function
isalnum	Identical to C function, but can apply to one character or a whole string
isalpha	Identical to C function, but can apply to one character or a whole string
isatty	Returns Boolean indicating whether the specified filehandle is connected to a TTY
iscntrl	Identical to C function, but can apply to one character or a whole string
isdigit	Identical to C function, but can apply to one character or a whole string
isgraph	Identical to C function, but can apply to one character or a whole string
islower	Identical to C function, but can apply to one character or a whole string
isprint	Identical to C function, but can apply to one character or a whole string
ispunct	Identical to C function, but can apply to one character or a whole string
isspace	Identical to C function, but can apply to one character or a whole string
isupper	Identical to C function, but can apply to one character or a whole string
isxdigit	Identical to C function, but can apply to one character or a whole string
kill	Identical to Perl's kill function
labs	C-specific; use Perl's abs function
ldexp	Identical to C function ldexp(3)
ldiv	C-specific; use division operator (/) and Perl's int function
link	Identical to Perl's link function
localeconv	Gets numeric formatting information; returns reference to a hash containing the current locale formatting values
localtime	Identical to Perl's localtime function
log	Identical to Perl's log function
log10	Identical to C function log10(3)
longjmp	C-specific; use Perl's die function
lseek	Moves the read/write file pointer; returns undef on failure
malloc	C-specific
mblen	Identical to C function mblen(3)
mbstowcs	Identical to C function mbstowcs(3)
mbtowc	Identical to C function mbtowc(3)
memchr	C-specific; use Perl's index
memcmp	C-specific; use eq
memcpy	C-specific; use =
memmove	C-specific; use =
memset	C-specific; use x
mkdir	Identical to Perl's mkdir function
mkfifo	Similar to C function mkfifo(2); returns undef on failure
mktime	Converts date/time information to a calendar time; returns undef on failure
modf	Returns integral and fractional parts of a floating-point number
nice	Similar to C function nice(3); returns undef on failure
offsetof	C-specific
open	Opens file for reading or writing; returns undef on failure
opendir	Opens directory for reading; returns undef on failure
pathconf	Retrieves value of a configurable limit on a file or directory; returns undef on failure
pause	Similar to C function pause(3); returns undef on failure
perror	Identical to C function perror(3)
pipe	Creates an interprocess channel
pow	Computes $x raised to the power $exponent
printf	Prints specified arguments to STDOUT
putc	C-specific; use Perl's print function
putchar	C-specific; use Perl's print function
puts	C-specific; use Perl's print function
qsort	C-specific; use Perl's sort function
raise	Sends specified signal to current process
rand	Nonportable; use Perl's rand function
read	Reads from a file; returns undef on failure
readdir	Identical to Perl's readdir function
realloc	C-specific
remove	Identical to Perl's unlink function
rename	Identical to Perl's rename function
rewind	Seeks to beginning of file
rewinddir	Identical to Perl's rewinddir function
rmdir	Identical to Perl's rmdir function
scanf	C-specific; use <> and regular expressions
setgid	Sets real group ID for this process
setjmp	C-specific; use eval {}
setlocale	Modifies and queries program's locale
setpgid	Similar to C function setpgid(2); returns undef on failure
setsid	Identical to C function setsid(8)
setuid	Sets real user ID for this process
sigaction	Detailed signal management; returns undef on failure
siglongjmp	C-specific; use Perl's die function
sigpending	Examines blocked, pending signals; returns undef on failure
sigprocmask	Changes and/or examines this process's signal mask; returns undef on failure
sigsetjmp	C-specific; use eval {}
sigsuspend	Installs signal mask and suspends process until signal arrives; returns undef on failure
sin	Identical to Perl's sin function
sinh	Identical to C function sinh(3)
sleep	Identical to Perl's sleep function
sprintf	Identical to Perl's sprintf function
sqrt	Identical to Perl's sqrt function
srand	Identical to Perl's srand function
sscanf	C-specific; use regular expressions
stat	Identical to Perl's stat function
strcat	C-specific; use .=
strchr	C-specific; use index
strcmp	C-specific; use eq
strcoll	Identical to C function strcoll(3)
strcpy	C-specific; use =
strcspn	C-specific; use regular expressions
strerror	Returns error string for the specified errno
strftime	Converts date and time to string and returns the string
strlen	C-specific; use length
strncat	C-specific; use .= and/or substr
strncmp	C-specific; use eq and/or substr
strncpy	C-specific; use = and/or substr
stroul	C-specific
strpbrk	C-specific
strrchr	C-specific; use rindex and/or substr
strspn	C-specific
strstr	Identical to Perl's index function
strtod	C-specific
strtok	C-specific
strtol	C-specific
strtoul	C-specific
strxfrm	String transformation; returns the transformed string
sysconf	Retrieves values of system configurable variables; returns undef on failure
system	Identical to Perl's system function
tan	Identical to C function tan(3)
tanh	Identical to C function tanh(3)
tcdrain	Similar to C function tcdrain(3); returns undef on failure
tcflow	Similar to C function tcflow(3); returns undef on failure
tcflush	Similar to C function tcflush(3); returns undef on failure
tcgetpgrp	Identical to C function tcgetpgrp(3)
tcsendbreak	Similar to C function tcsendbreak(3); returns undef on failure
tcsetpgrp	Similar to C function tcsetpgrp(3); returns undef on failure
time	Identical to Perl's time function
times	Returns, in clock ticks, elapsed realtime since a point in the past, user and system times for this process, and user and system times for child processes
tmpfile	Uses method FileHandle::new_tmpfile
tmpnam	Returns a name for a temporary file
tolower	Identical to Perl's lc function
toupper	Identical to Perl's uc function
ttyname	Identical to C function ttyname(3)
tzname	Retrieves time conversion information from the tzname variable
tzset	Identical to C function tzset(3)
umask	Identical to Perl's umask function
uname	Gets name of current operating system
ungetc	Uses method FileHandle::ungetc
unlink	Identical to Perl's unlink function
utime	Identical to Perl's utime function
vfprintf	C-specific
vprintf	C-specific
vsprintf	C-specific
wait	Identical to Perl's wait function
waitpid	Waits for child process to change state; identical to Perl's waitpid function
wcstombs	Identical to C function wcstombs(3)
wctomb	Identical to C function wctomb(3)
write	Writes to file; returns undef on failure

Function

Description

_exit

Identical to C function _exit(2)

abort

Identical to C function abort(3)

abs

Identical to Perl's abs function

access

Determines accessibility of a file; returns undef on failure

acos

Identical to C function acos(3)

alarm

Identical to Perl's alarm function

asctime

Identical to C function asctime(3)

asin

Identical to C function asin(3)

assert

Similar to C macro assert(3)

atan

Identical to C function atan(3)

atan2

Identical to Perl's atan2 function

atexit

C-specific; use END {}

atof

C-specific

atoi

C-specific

atol

C-specific

bsearch

Not supplied

calloc

C-specific

ceil

Identical to C function ceil(3)

chdir

Identical to Perl's chdir function

chmod

Identical to Perl's chmod function

chown

Identical to Perl's chown function

clearerr

Uses method FileHandle::clearerr

clock

Identical to C function clock(3)

Closes a file; returns undef on failure

closedir

Identical to Perl's closedir function

cos

Identical to Perl's cos function

cosh

Identical to C function cosh(3)

creat

Creates a new file

ctermid

Generates pathname for the controlling terminal

ctime

Identical to C function ctime(3)

cuserid

Gets user's login name

difftime

Identical to C function difftime(3)

div

C-specific

dup

Similar to C function dup(2); returns undef on failure

dup2

Similar to C function dup2(2); returns undef on failure

errno

Returns the value of errno

execl

C-specific; use Perl's exec

execle

C-specific; use Perl's exec

execlp

C-specific; use Perl's exec

execv

C-specific; use Perl's exec

execve

C-specific; use Perl's exec

execvp

C-specific; use Perl's exec

exit

Identical to Perl's exit function

exp

Identical to Perl's exp function

fabs

Identical to Perl's abs function

fclose

Uses method FileHandle::close

fcntl

Identical to Perl's fcntl function

fdopen

Uses method FileHandle::new_from_fd

feof

Uses method FileHandle::eof

ferror

Uses method FileHandle::error

fflush

Uses method FileHandle::flush

fgetc

Uses method FileHandle::getc

fgetpos

Uses method FileHandle::getpos

fgets

Uses method FileHandle::gets

fileno

Uses method FileHandle::fileno

floor

Identical to C function floor(3)

fmod

Identical to C function fmod(3)

fopen

Uses method FileHandle::open

fork

Identical to Perl's fork function

fpathconf

Returns value of a configurable limit on a file or directory, or undef on failure

fprintf

C-specific; use Perl's printf function

fputc

C-specific; use Perl's print function

fputs

C-specific; use Perl's print function

fread

C-specific; use Perl's read function

free

C-specific

freopen

C-specific; use Perl's open function

frexp

Returns mantissa and exponent of a floating-point number

fscanf

C-specific; use <> and regular expressions

fseek

Uses method FileHandle::seek

fsetpos

Uses method FileHandle::setpos

fstat

Gets file status

ftell

Uses method FileHandle::tell

fwrite

C-specific; use Perl's print function

getc

Identical to Perl's etc function

getchar

Returns one character from STDIN

getcwd

Returns name of current working directory

getegid

Returns effective group ID (gid)

getenv

Returns value of the specified environment variable

geteuid

Returns the effective user ID (uid)

getgid

Returns the user's real group ID (gid)

getgrgid

Identical to Perl's getgrgid function

getgrnam

Identical to Perl's getgrnam function

getgroups

Returns IDs of the user's supplementary groups

getlogin

Identical to Perl's getlogin function

getpgrp

Identical to Perl's getpgrp function

getpid

Returns ID of the process (pid)

getppid

Identical to Perl's getppid function

getpwnam

Identical to Perl's getpwnam function

getpwuid

Identical to Perl's getpwuid function

gets

Returns one line from STDIN

getuid

Returns user's ID (uid)

gmtime

Identical to Perl's gmtime function

isalnum