lib:POSIX
See the current Perl documentation for lib:POSIX.
Here is our local, out-dated (pre-5.6) version:
POSIX - Perl interface to IEEE Std 1003.1
use POSIX; use POSIX qw(setsid); use POSIX qw(:errno_h :fcntl_h);
printf "EINTR is %d\n", EINTR;
$sess_id = POSIX::setsid();
$fd = POSIX::open($path, O_
The POSIX module permits you to access all (or nearly all) the standard POSIX 1003.1 identifiers. Many of these identifiers have been given Perl-ish interfaces. Things which are
#defines
in C, like EINTR or O_NDELAY, are automatically exported into your namespace. All functions are only exported if you ask for them explicitly. Most likely people will prefer to use the fully-qualified function names.This document gives a condensed list of the features available in the POSIX module. Consult your operating system's manpages for general information on most features. Consult perlfunc for functions which are noted as being identical to Perl's builtin functions.
The first section describes POSIX functions from the 1003.1 specification. The second section describes some classes for signal objects, TTY objects, and other miscellaneous objects. The remaining sections list various constants and macros in an organization which roughly follows IEEE Std 1003.1b-1993.
NOTE
The POSIX module is probably the most complex Perl module supplied with the standard distribution. It incorporates autoloading, namespace games, and dynamic loading of code that's in Perl, C, or both. It's a great source of wisdom.
CAVEATS
A few functions are not implemented because they are C specific. If you attempt to call these, they will print a message telling you that they aren't implemented, and suggest using the Perl equivalent should one exist. For example, trying to access the
setjmp()
call will elicit the message ``setjmp() is C-specific: use eval {} instead''.Furthermore, some evil vendors will claim 1003.1 compliance, but in fact are not so: they will not pass the PCTS (POSIX Compliance Test Suites). For example, one vendor may not define EDEADLK, or the semantics of the errno values set by
open(2)
might not be quite right. Perl does not attempt to verify POSIX compliance. That means you can currently successfully say ``use POSIX'', and then later in your program you find that your vendor has been lax and there's no usable ICANON macro after all. This could be construed to be a bug.
FUNCTIONS
- _exit
-
This is identical to the
C function
_exit()
. - abort
-
This is identical to the
C function
abort()
. - abs
- This is identical to Perl's builtin abs function.
- access
-
Determines the accessibility of a file.
if( POSIX::access( "/", &POSIX::R_OK ) ){ print "have read permission\n"; }
Returns undef on failure.
- acos
-
This is identical to the
C function
acos()
. - alarm
- This is identical to Perl's builtin alarm function.
- asctime
-
This is identical to the
C function
asctime()
. - asin
-
This is identical to the
C function
asin()
. - assert
- Unimplemented.
- atan
-
This is identical to the
C function
atan()
. - atan2
- This is identical to Perl's builtin atan2 function.
- atexit
-
atexit()
is C-specific: use END {} instead. - atof
-
atof()
is C-specific. - atoi
-
atoi()
is C-specific. - atol
-
atol()
is C-specific. - bsearch
-
bsearch()
not supplied. - calloc
-
calloc()
is C-specific. - ceil
-
This is identical to the
C function
ceil()
. - chdir
- This is identical to Perl's builtin chdir function.
- chmod
- This is identical to Perl's builtin chmod function.
- chown
- This is identical to Perl's builtin chown function.
- clearerr
-
Use method
IO::Handle::clearerr()
instead. - clock
-
This is identical to the
C function
clock()
. - close
-
Close the file. This uses file descriptors such as those obtained by
calling
POSIX::open
.$fd = POSIX::open( "foo", &POSIX::O_RDONLY ); POSIX::close( $fd );
Returns undef on failure.
- closedir
- This is identical to Perl's builtin closedir function.
- cos
- This is identical to Perl's builtin cos function.
- cosh
-
This is identical to the
C function
cosh()
. - creat
-
Create a new file. This returns a file descriptor like the ones returned by
POSIX::open
. UsePOSIX::close
to close the file.$fd = POSIX::creat( "foo", 0611 ); POSIX::close( $fd );
- ctermid
-
Generates the path name for the controlling terminal.
$path = POSIX::ctermid();
- ctime
-
This is identical to the
C function
ctime()
. - cuserid
-
Get the character login name of the user.
$name = POSIX::cuserid();
- difftime
-
This is identical to the
C function
difftime()
. - div
-
div()
is C-specific. - dup
-
This is similar to the
C function
dup()
.This uses file descriptors such as those obtained by calling
POSIX::open
.Returns undef on failure.
- dup2
-
This is similar to the
C function
dup2()
.This uses file descriptors such as those obtained by calling
POSIX::open
.Returns undef on failure.
- errno
-
Returns the value of errno.
$errno = POSIX::errno();
- execl
-
execl()
is C-specific. - execle
-
execle()
is C-specific. - execlp
-
execlp()
is C-specific. - execv
-
execv()
is C-specific. - execve
-
execve()
is C-specific. - execvp
-
execvp()
is C-specific. - exit
- This is identical to Perl's builtin exit function.
- exp
- This is identical to Perl's builtin exp function.
- fabs
- This is identical to Perl's builtin abs function.
- fclose
-
Use method
IO::Handle::close()
instead. - fcntl
- This is identical to Perl's builtin fcntl function.
- fdopen
-
Use method
IO::Handle::new_from_fd()
instead. - feof
-
Use method
IO::Handle::eof()
instead. - ferror
-
Use method
IO::Handle::error()
instead. - fflush
-
Use method
IO::Handle::flush()
instead. - fgetc
-
Use method
IO::Handle::getc()
instead. - fgetpos
-
Use method
IO::Seekable::getpos()
instead. - fgets
-
Use method
IO::Handle::gets()
instead. - fileno
-
Use method
IO::Handle::fileno()
instead. - floor
-
This is identical to the
C function
floor()
. - fmod
-
This is identical to the
C function
fmod()
. - fopen
-
Use method
IO::File::open()
instead. - fork
- This is identical to Perl's builtin fork function.
- fpathconf
-
Retrieves the value of a configurable limit on a file or directory. This
uses file descriptors such as those obtained by calling
POSIX::open
.The following will determine the maximum length of the longest allowable pathname on the filesystem which holds
/tmp/foo
.$fd = POSIX::open( "/tmp/foo", &POSIX::O_RDONLY ); $path_max = POSIX::fpathconf( $fd, &POSIX::_PC_PATH_MAX );
Returns undef on failure.
- fprintf
-
fprintf()
is C-specific--use printf instead. - fputc
-
fputc()
is C-specific--use print instead. - fputs
-
fputs()
is C-specific--use print instead. - fread
-
fread()
is C-specific--use read instead. - free
-
free()
is C-specific. - freopen
-
freopen()
is C-specific--use open instead. - frexp
-
Return the mantissa and exponent of a floating-point number.
($mantissa, $exponent) = POSIX::frexp( 3.14 );
- fscanf
-
fscanf()
is C-specific--use <> and regular expressions instead. - fseek
-
Use method
IO::Seekable::seek()
instead. - fsetpos
-
Use method
IO::Seekable::setpos()
instead. - fstat
-
Get file status. This uses file descriptors such as those obtained by
calling
POSIX::open
. The data returned is identical to the data from Perl's builtin stat function.$fd = POSIX::open( "foo", &POSIX::O_RDONLY ); @stats = POSIX::fstat( $fd );
- ftell
-
Use method
IO::Seekable::tell()
instead. - fwrite
-
fwrite()
is C-specific--use print instead. - getc
- This is identical to Perl's builtin getc function.
- getchar
- Returns one character from STDIN.
- getcwd
- Returns the name of the current working directory.
- getegid
- Returns the effective group id.
- getenv
- Returns the value of the specified enironment variable.
- geteuid
- Returns the effective user id.
- getgid
- Returns the user's real group id.
- getgrgid
- This is identical to Perl's builtin getgrgid function.
- getgrnam
- This is identical to Perl's builtin getgrnam function.
- getgroups
- Returns the ids of the user's supplementary groups.
- getlogin
- This is identical to Perl's builtin getlogin function.
- getpgrp
- This is identical to Perl's builtin getpgrp function.
- getpid
- Returns the process's id.
- getppid
- This is identical to Perl's builtin getppid function.
- getpwnam
- This is identical to Perl's builtin getpwnam function.
- getpwuid
- This is identical to Perl's builtin getpwuid function.
- gets
- Returns one line from STDIN.
- getuid
- Returns the user's id.
- gmtime
- This is identical to Perl's builtin gmtime function.
- isalnum
- This is identical to the C function, except that it can apply to a single character or to a whole string.
- isalpha
- This is identical to the C function, except that it can apply to a single character or to a whole string.
- isatty
- Returns a boolean indicating whether the specified filehandle is connected to a tty.
- iscntrl
- This is identical to the C function, except that it can apply to a single character or to a whole string.
- isdigit
- This is identical to the C function, except that it can apply to a single character or to a whole string.
- isgraph
- This is identical to the C function, except that it can apply to a single character or to a whole string.
- islower
- This is identical to the C function, except that it can apply to a single character or to a whole string.
- isprint
- This is identical to the C function, except that it can apply to a single character or to a whole string.
- ispunct
- This is identical to the C function, except that it can apply to a single character or to a whole string.
- isspace
- This is identical to the C function, except that it can apply to a single character or to a whole string.
- isupper
- This is identical to the C function, except that it can apply to a single character or to a whole string.
- isxdigit
- This is identical to the C function, except that it can apply to a single character or to a whole string.
- kill
- This is identical to Perl's builtin kill function.
- labs
-
labs()
is C-specific, use abs instead. - ldexp
-
This is identical to the
C function
ldexp()
. - ldiv
-
ldiv()
is C-specific, use / and int instead. - link
- This is identical to Perl's builtin link function.
- localeconv
-
Get numeric formatting information. Returns a reference to a hash
containing the current locale formatting values.
The database for the de (Deutsch or German) locale.
$loc = POSIX::setlocale( &POSIX::LC_ALL, "de" ); print "Locale = $loc\n"; $lconv = POSIX::localeconv(); print "decimal_point = ", $lconv->{decimal_point}, "\n"; print "thousands_sep = ", $lconv->{thousands_sep}, "\n"; print "grouping = ", $lconv->{grouping}, "\n"; print "int_curr_symbol = ", $lconv->{int_curr_symbol}, "\n"; print "currency_symbol = ", $lconv->{currency_symbol}, "\n"; print "mon_decimal_point = ", $lconv->{mon_decimal_point}, "\n"; print "mon_thousands_sep = ", $lconv->{mon_thousands_sep}, "\n"; print "mon_grouping = ", $lconv->{mon_grouping}, "\n"; print "positive_sign = ", $lconv->{positive_sign}, "\n"; print "negative_sign = ", $lconv->{negative_sign}, "\n"; print "int_frac_digits = ", $lconv->{int_frac_digits}, "\n"; print "frac_digits = ", $lconv->{frac_digits}, "\n"; print "p_cs_precedes = ", $lconv->{p_cs_precedes}, "\n"; print "p_sep_by_space = ", $lconv->{p_sep_by_space}, "\n"; print "n_cs_precedes = ", $lconv->{n_cs_precedes}, "\n"; print "n_sep_by_space = ", $lconv->{n_sep_by_space}, "\n"; print "p_sign_posn = ", $lconv->{p_sign_posn}, "\n"; print "n_sign_posn = ", $lconv->{n_sign_posn}, "\n";
- localtime
- This is identical to Perl's builtin localtime function.
- log
- This is identical to Perl's builtin log function.
- log10
-
This is identical to the
C function
log10()
. - longjmp
-
longjmp()
is C-specific: use die instead. - lseek
-
Move the file's read/write position. This uses file descriptors such as
those obtained by calling
POSIX::open
.$fd = POSIX::open( "foo", &POSIX::O_RDONLY ); $off_t = POSIX::lseek( $fd, 0, &POSIX::SEEK_SET );
Returns undef on failure.
- malloc
-
malloc()
is C-specific. - mblen
-
This is identical to the
C function
mblen()
. - mbstowcs
-
This is identical to the
C function
mbstowcs()
. - mbtowc
-
This is identical to the
C function
mbtowc()
. - memchr
-
memchr()
is C-specific, useindex()
instead. - memcmp
-
memcmp()
is C-specific, use eq instead. - memcpy
-
memcpy()
is C-specific, use = instead. - memmove
-
memmove()
is C-specific, use = instead. - memset
-
memset()
is C-specific, use x instead. - mkdir
- This is identical to Perl's builtin mkdir function.
- mkfifo
-
This is similar to the
C function
mkfifo()
.Returns undef on failure.
- mktime
-
Convert date/time info to a calendar time.
Synopsis:
mktime(sec, min, hour, mday, mon, year, wday = 0, yday = 0, isdst = 0)
The month (
mon
), weekday (wday
), and yearday (yday
) begin at zero. I.e. January is 0, not 1; Sunday is 0, not 1; January 1st is 0, not 1. The year (year
) is given in years since 1900. I.e. The year 1995 is 95; the year 2001 is 101. Consult your system'smktime()
manpage for details about these and the other arguments.Calendar time for December 12, 1995, at 10:30 am.
$time_t = POSIX::mktime( 0, 30, 10, 12, 11, 95 ); print "Date = ", POSIX::ctime($time_t);
Returns undef on failure.
- modf
-
Return the integral and fractional parts of a floating-point number.
($fractional, $integral) = POSIX::modf( 3.14 );
- nice
-
This is similar to the
C function
nice()
.Returns undef on failure.
- offsetof
-
offsetof()
is C-specific. - open
-
Open a file for reading for writing. This returns file descriptors, not
Perl filehandles. Use
POSIX::close
to close the file.Open a file read-only with mode 0666.
$fd = POSIX::open( "foo" );
Open a file for read and write.
$fd = POSIX::open( "foo", &POSIX::O_RDWR );
Open a file for write, with truncation.
$fd = POSIX::open( "foo", &POSIX::O_WRONLY | &POSIX::O_TRUNC );
Create a new file with mode 0640. Set up the file for writing.
$fd = POSIX::open( "foo", &POSIX::O_CREAT | &POSIX::O_WRONLY, 0640 );
Returns undef on failure.
- opendir
-
Open a directory for reading.
$dir = POSIX::opendir( "/tmp" ); @files = POSIX::readdir( $dir ); POSIX::closedir( $dir );
Returns undef on failure.
- pathconf
-
Retrieves the value of a configurable limit on a file or directory.
The following will determine the maximum length of the longest allowable pathname on the filesystem which holds
/tmp
.$path_max = POSIX::pathconf( "/tmp", &POSIX::_PC_PATH_MAX );
Returns undef on failure.
- pause
-
This is similar to the
C function
pause()
.Returns undef on failure.
- perror
-
This is identical to the
C function
perror()
. - pipe
-
Create an interprocess channel. This returns file descriptors like those
returned by
POSIX::open
.($fd0, $fd1) = POSIX::pipe(); POSIX::write( $fd0, "hello", 5 ); POSIX::read( $fd1, $buf, 5 );
- pow
-
Computes
$x
raised to the power $exponent.$ret = POSIX::pow( $x, $exponent );
- printf
- Prints the specified arguments to STDOUT.
- putc
-
putc()
is C-specific--use print instead. - putchar
-
putchar()
is C-specific--use print instead. - puts
-
puts()
is C-specific--use print instead. - qsort
-
qsort()
is C-specific, use sort instead. - raise
- Sends the specified signal to the current process.
- rand
-
rand()
is non-portable, use Perl's rand instead. - read
-
Read from a file. This uses file descriptors such as those obtained by
calling
POSIX::open
. If the buffer$buf
is not large enough for the read then Perl will extend it to make room for the request.$fd = POSIX::open( "foo", &POSIX::O_RDONLY ); $bytes = POSIX::read( $fd, $buf, 3 );
Returns undef on failure.
- readdir
- This is identical to Perl's builtin readdir function.
- realloc
-
realloc()
is C-specific. - remove
- This is identical to Perl's builtin unlink function.
- rename
- This is identical to Perl's builtin rename function.
- rewind
- Seeks to the beginning of the file.
- rewinddir
- This is identical to Perl's builtin rewinddir function.
- rmdir
- This is identical to Perl's builtin rmdir function.
- scanf
-
scanf()
is C-specific--use <> and regular expressions instead. - setgid
- Sets the real group id for this process.
- setjmp
-
setjmp()
is C-specific: use eval {} instead. - setlocale
-
Modifies and queries program's locale.
The following will set the traditional UNIX system locale behavior (the second argument perlop).
$loc = POSIX::setlocale( &POSIX::LC_ALL, "C" );
The following will query (the missing second argument) the current LC_CTYPE category.
$loc = POSIX::setlocale( &POSIX::LC_CTYPE);
The following will set the LC_CTYPE behaviour according to the locale environment variables (the second argument
""
). Please see your systems setlocale(3) documentation for the locale environment variables' meaning or consult perllocale.$loc = POSIX::setlocale( &POSIX::LC_CTYPE, "");
The following will set the LC_COLLATE behaviour to Argentinian Spanish. NOTE: The naming and availability of locales depends on your operating system. Please consult perllocale for how to find out which locales are available in your system.
$loc = POSIX::setlocale( &POSIX::LC_ALL, "es_AR.ISO8859-1" );
- setpgid
-
This is similar to the
C function
setpgid()
.Returns undef on failure.
- setsid
-
This is identical to the
C function
setsid()
. - setuid
- Sets the real user id for this process.
- sigaction
-
Detailed signal management. This uses
POSIX::SigAction
objects for theaction
andoldaction
arguments. Consult your system'ssigaction
manpage for details.Synopsis:
sigaction(sig, action, oldaction = 0)
Returns undef on failure.
- siglongjmp
-
siglongjmp()
is C-specific: use die instead. - sigpending
-
Examine signals that are blocked and pending. This uses
POSIX::SigSet
objects for thesigset
argument. Consult your system'ssigpending
manpage for details.Synopsis:
sigpending(sigset)
Returns undef on failure.
- sigprocmask
-
Change and/or examine calling process's signal mask. This uses
POSIX::SigSet
objects for thesigset
andoldsigset
arguments. Consult your system'ssigprocmask
manpage for details.Synopsis:
sigprocmask(how, sigset, oldsigset = 0)
Returns undef on failure.
- sigsetjmp
-
sigsetjmp()
is C-specific: use eval {} instead. - sigsuspend
-
Install a signal mask and suspend process until signal arrives. This uses
POSIX::SigSet
objects for thesignal_mask
argument. Consult your system'ssigsuspend
manpage for details.Synopsis:
sigsuspend(signal_mask)
Returns undef on failure.
- sin
- This is identical to Perl's builtin sin function.
- sinh
-
This is identical to the
C function
sinh()
. - sleep
- This is identical to Perl's builtin sleep function.
- sprintf
- This is identical to Perl's builtin sprintf function.
- sqrt
- This is identical to Perl's builtin sqrt function.
- srand
-
srand().
- sscanf
-
sscanf()
is C-specific--use regular expressions instead. - stat
- This is identical to Perl's builtin stat function.
- strcat
-
strcat()
is C-specific, use .= instead. - strchr
-
strchr()
is C-specific, useindex()
instead. - strcmp
-
strcmp()
is C-specific, use eq instead. - strcoll
-
This is identical to the
C function
strcoll()
. - strcpy
-
strcpy()
is C-specific, use = instead. - strcspn
-
strcspn()
is C-specific, use regular expressions instead. - strerror
- Returns the error string for the specified errno.
- strftime
-
Convert date and time information to string. Returns the string.
Synopsis:
strftime(fmt, sec, min, hour, mday, mon, year, wday = 0, yday = 0, isdst = 0)
The month (
mon
), weekday (wday
), and yearday (yday
) begin at zero. I.e. January is 0, not 1; Sunday is 0, not 1; January 1st is 0, not 1. The year (year
) is given in years since 1900. I.e. The year 1995 is 95; the year 2001 is 101. Consult your system'sstrftime()
manpage for details about these and the other arguments.The string for Tuesday, December 12, 1995.
$str = POSIX::strftime( "%A, %B %d, %Y", 0, 0, 0, 12, 11, 95, 2 ); print "$str\n";
- strlen
-
strlen()
is C-specific, use length instead. - strncat
-
strncat()
is C-specific, use .= instead. - strncmp
-
strncmp()
is C-specific, use eq instead. - strncpy
-
strncpy()
is C-specific, use = instead. - stroul
-
stroul()
is C-specific. - strpbrk
-
strpbrk()
is C-specific. - strrchr
-
strrchr()
is C-specific, userindex()
instead. - strspn
-
strspn()
is C-specific. - strstr
- This is identical to Perl's builtin index function.
- strtod
-
String to double translation. Returns the parsed number and the number of characters in the unparsed portion of the string. Truly POSIX-compliant systems set $!
($ERRNO) to indicate a translation error, so clear $! before calling strtod. However, non-POSIX systems may not check for overflow, and therefore will never set $!.
strtod should respect any POSIX setlocale() settings.
To parse a string
$str
as a floating point number use$! = 0; ($num, $n_unparsed) = POSIX::strtod($str);
The second returned item and $! can be used to check for valid input:
if (($str eq '') || ($n_unparsed != 0) || !$!) { die "Non-numeric input $str" . $! ? ": $!\n" : "\n"; }
When called in a scalar context strtod returns the parsed number.
- strtok
-
strtok()
is C-specific. - strtol
-
String to (long) integer translation. Returns the parsed number and the number of characters in the unparsed portion of the string. Truly POSIX-compliant systems set $!
($ERRNO) to indicate a translation error, so clear $! before calling strtol. However, non-POSIX systems may not check for overflow, and therefore will never set $!.
strtol should respect any POSIX setlocale() settings.
To parse a string
$str
as a number in some base$base
use$! = 0; ($num, $n_unparsed) = POSIX::strtol($str, $base);
The base should be zero or between 2 and 36, inclusive. When the base is zero or omitted strtol will use the string itself to determine the base: a leading ``0x'' or ``0X'' means hexadecimal; a leading ``0'' means octal; any other leading characters mean decimal. Thus, ``1234'' is parsed as a decimal number, ``01234'' as an octal number, and ``0x1234'' as a hexadecimal number.
The second returned item and $! can be used to check for valid input:
if (($str eq '') || ($n_unparsed != 0) || !$!) { die "Non-numeric input $str" . $! ? ": $!\n" : "\n"; }
When called in a scalar context strtol returns the parsed number.
- strtoul
-
String to unsigned (long) integer translation. strtoul is identical to
strtol except that strtoul only parses unsigned integers. See
strtol for details.
Note: Some vendors supply strtod and strtol but not strtoul. Other vendors that do suply strtoul parse ``-1'' as a valid value.
- strxfrm
-
String transformation. Returns the transformed string.
$dst = POSIX::strxfrm( $src );
- sysconf
-
Retrieves values of system configurable variables.
The following will get the machine's clock speed.
$clock_ticks = POSIX::sysconf( &POSIX::_SC_CLK_TCK );
Returns undef on failure.
- system
- This is identical to Perl's builtin system function.
- tan
-
This is identical to the
C function
tan()
. - tanh
-
This is identical to the
C function
tanh()
. - tcdrain
-
This is similar to the
C function
tcdrain()
.Returns undef on failure.
- tcflow
-
This is similar to the
C function
tcflow()
.Returns undef on failure.
- tcflush
-
This is similar to the
C function
tcflush()
.Returns undef on failure.
- tcgetpgrp
-
This is identical to the
C function
tcgetpgrp()
. - tcsendbreak
-
This is similar to the
C function
tcsendbreak()
.Returns undef on failure.
- tcsetpgrp
-
This is similar to the
C function
tcsetpgrp()
.Returns undef on failure.
- time
- This is identical to Perl's builtin time function.
- times
-
The
times()
function returns elapsed realtime since some point in the past (such as system startup), user and system times for this process, and user and system times used by child processes. All times are returned in clock ticks.($realtime, $user, $system, $cuser, $csystem) = POSIX::times();
Note: Perl's builtin times function returns four values, measured in seconds.
- tmpfile
-
Use method
IO::File::new_tmpfile()
instead. - tmpnam
-
Returns a name for a temporary file.
$tmpfile = POSIX::tmpnam();
- tolower
- This is identical to Perl's builtin lc function.
- toupper
- This is identical to Perl's builtin uc function.
- ttyname
-
This is identical to the
C function
ttyname()
. - tzname
-
Retrieves the time conversion information from the
tzname
variable.POSIX::tzset(); ($std, $dst) = POSIX::tzname();
- tzset
-
This is identical to the
C function
tzset()
. - umask
- This is identical to Perl's builtin umask function.
- uname
-
Get name of current operating system.
($sysname, $nodename, $release, $version, $machine ) = POSIX::uname();
- ungetc
-
Use method
IO::Handle::ungetc()
instead. - unlink
- This is identical to Perl's builtin unlink function.
- utime
- This is identical to Perl's builtin utime function.
- vfprintf
-
vfprintf()
is C-specific. - vprintf
-
vprintf()
is C-specific. - vsprintf
-
vsprintf()
is C-specific. - wait
- This is identical to Perl's builtin wait function.
- waitpid
-
Wait for a child process to change state. This is identical to Perl's
builtin waitpid function.
$pid = POSIX::waitpid( -1, &POSIX::WNOHANG ); print "status = ", ($? / 256), "\n";
- wcstombs
-
This is identical to the
C function
wcstombs()
. - wctomb
-
This is identical to the
C function
wctomb()
. - write
-
Write to a file. This uses file descriptors such as those obtained by
calling
POSIX::open
.$fd = POSIX::open( "foo", &POSIX::O_WRONLY ); $buf = "hello"; $bytes = POSIX::write( $b, $buf, 5 );
Returns undef on failure.
CLASSES
POSIX::SigAction
- new
-
Creates a new
POSIX::SigAction
object which corresponds to the Cstruct sigaction
. This object will be destroyed automatically when it is no longer needed. The first parameter is the fully-qualified name of a sub which is a signal-handler. The second parameter is aPOSIX::SigSet
object, it defaults to the empty set. The third parameter contains thesa_flags
, it defaults to 0.$sigset = POSIX::SigSet->new(SIGINT, SIGQUIT); $sigaction = POSIX::SigAction->new( 'main::handler', $sigset, &POSIX::SA_NOCLDSTOP );
This
POSIX::SigAction
object should be used with thePOSIX::sigaction()
function.
POSIX::SigSet
- new
-
Create a new SigSet object. This object will be destroyed automatically
when it is no longer needed. Arguments may be supplied to initialize the
set.
Create an empty set.
$sigset = POSIX::SigSet->new;
Create a set with SIGUSR1.
$sigset = POSIX::SigSet->new( &POSIX::SIGUSR1 );
- addset
-
Add a signal to a SigSet object.
$sigset->addset( &POSIX::SIGUSR2 );
Returns undef on failure.
- delset
-
Remove a signal from the SigSet object.
$sigset->delset( &POSIX::SIGUSR2 );
Returns undef on failure.
- emptyset
-
Initialize the SigSet object to be empty.
$sigset->emptyset();
Returns undef on failure.
- fillset
-
Initialize the SigSet object to include all signals.
$sigset->fillset();
Returns undef on failure.
- ismember
-
Tests the SigSet object to see if it contains a specific signal.
if( $sigset->ismember( &POSIX::SIGUSR1 ) ){ print "contains SIGUSR1\n"; }
POSIX::Termios
- new
-
Create a new Termios object. This object will be destroyed automatically when it is no longer needed.
A Termios object corresponds to the termios
C struct.
new()
mallocs a new one,getattr()
fills it from a file descriptor, andsetattr()
sets a file descriptor's parameters to match Termios' contents.$termios = POSIX::Termios->new;
- getattr
-
Get terminal control attributes.
Obtain the attributes for stdin.
$termios->getattr()
Obtain the attributes for stdout.
$termios->getattr( 1 )
Returns undef on failure.
- getcc
-
Retrieve a value from the c_cc field of a termios object. The c_cc field is
an array so an index must be specified.
$c_cc[1] = $termios->getcc(1);
- getcflag
-
Retrieve the c_cflag field of a termios object.
$c_cflag = $termios->getcflag;
- getiflag
-
Retrieve the c_iflag field of a termios object.
$c_iflag = $termios->getiflag;
- getispeed
-
Retrieve the input baud rate.
$ispeed = $termios->getispeed;
- getlflag
-
Retrieve the c_lflag field of a termios object.
$c_lflag = $termios->getlflag;
- getoflag
-
Retrieve the c_oflag field of a termios object.
$c_oflag = $termios->getoflag;
- getospeed
-
Retrieve the output baud rate.
$ospeed = $termios->getospeed;
- setattr
-
Set terminal control attributes.
Set attributes immediately for stdout.
$termios->setattr( 1, &POSIX::TCSANOW );
Returns undef on failure.
- setcc
-
Set a value in the c_cc field of a termios object. The c_cc field is an
array so an index must be specified.
$termios->setcc( &POSIX::VEOF, 1 );
- setcflag
-
Set the c_cflag field of a termios object.
$termios->setcflag( $c_cflag | &POSIX::CLOCAL );
- setiflag
-
Set the c_iflag field of a termios object.
$termios->setiflag( $c_iflag | &POSIX::BRKINT );
- setispeed
-
Set the input baud rate.
$termios->setispeed( &POSIX::B9600 );
Returns undef on failure.
- setlflag
-
Set the c_lflag field of a termios object.
$termios->setlflag( $c_lflag | &POSIX::ECHO );
- setoflag
-
Set the c_oflag field of a termios object.
$termios->setoflag( $c_oflag | &POSIX::OPOST );
- setospeed
-
Set the output baud rate.
$termios->setospeed( &POSIX::B9600 );
Returns undef on failure.
- Baud rate values
- B38400 B75 B200 B134 B300 B1800 B150 B0 B19200 B1200 B9600 B600 B4800 B50 B2400 B110
- Terminal interface values
- TCSADRAIN TCSANOW TCOON TCIOFLUSH TCOFLUSH TCION TCIFLUSH TCSAFLUSH TCIOFF TCOOFF
- c_cc field values
- VEOF VEOL VERASE VINTR VKILL VQUIT VSUSP VSTART VSTOP VMIN VTIME NCCS
- c_cflag field values
- CLOCAL CREAD CSIZE CS5 CS6 CS7 CS8 CSTOPB HUPCL PARENB PARODD
- c_iflag field values
- BRKINT ICRNL IGNBRK IGNCR IGNPAR INLCR INPCK ISTRIP IXOFF IXON PARMRK
- c_lflag field values
- ECHO ECHOE ECHOK ECHONL ICANON IEXTEN ISIG NOFLSH TOSTOP
- c_oflag field values
- OPOST
PATHNAME CONSTANTS
- Constants
- _PC_CHOWN_RESTRICTED _PC_LINK_MAX _PC_MAX_CANON _PC_MAX_INPUT _PC_NAME_MAX _PC_NO_TRUNC _PC_PATH_MAX _PC_PIPE_BUF _PC_VDISABLE
POSIX CONSTANTS
- Constants
- _POSIX_ARG_MAX _POSIX_CHILD_MAX _POSIX_CHOWN_RESTRICTED _POSIX_JOB_CONTROL _POSIX_LINK_MAX _POSIX_MAX_CANON _POSIX_MAX_INPUT _POSIX_NAME_MAX _POSIX_NGROUPS_MAX _POSIX_NO_TRUNC _POSIX_OPEN_MAX _POSIX_PATH_MAX _POSIX_PIPE_BUF _POSIX_SAVED_IDS _POSIX_SSIZE_MAX _POSIX_STREAM_MAX _POSIX_TZNAME_MAX _POSIX_VDISABLE _POSIX_VERSION
SYSTEM CONFIGURATION
- Constants
- _SC_ARG_MAX _SC_CHILD_MAX _SC_CLK_TCK _SC_JOB_CONTROL _SC_NGROUPS_MAX _SC_OPEN_MAX _SC_SAVED_IDS _SC_STREAM_MAX _SC_TZNAME_MAX _SC_VERSION
ERRNO
- Constants
- E2BIG EACCES EADDRINUSE EADDRNOTAVAIL EAFNOSUPPORT EAGAIN EALREADY EBADF EBUSY ECHILD ECONNABORTED ECONNREFUSED ECONNRESET EDEADLK EDESTADDRREQ EDOM EDQUOT EEXIST EFAULT EFBIG EHOSTDOWN EHOSTUNREACH EINPROGRESS EINTR EINVAL EIO EISCONN EISDIR ELOOP EMFILE EMLINK EMSGSIZE ENAMETOOLONG ENETDOWN ENETRESET ENETUNREACH ENFILE ENOBUFS ENODEV ENOENT ENOEXEC ENOLCK ENOMEM ENOPROTOOPT ENOSPC ENOSYS ENOTBLK ENOTCONN ENOTDIR ENOTEMPTY ENOTSOCK ENOTTY ENXIO EOPNOTSUPP EPERM EPFNOSUPPORT EPIPE EPROCLIM EPROTONOSUPPORT EPROTOTYPE ERANGE EREMOTE ERESTART EROFS ESHUTDOWN ESOCKTNOSUPPORT ESPIPE ESRCH ESTALE ETIMEDOUT ETOOMANYREFS ETXTBSY EUSERS EWOULDBLOCK EXDEV
FCNTL
- Constants
- FD_CLOEXEC F_DUPFD F_GETFD F_GETFL F_GETLK F_OK F_RDLCK F_SETFD F_SETFL F_SETLK F_SETLKW F_UNLCK F_WRLCK O_ACCMODE O_APPEND O_CREAT O_EXCL O_NOCTTY O_NONBLOCK O_RDONLY O_RDWR O_TRUNC O_WRONLY
FLOAT
- Constants
- DBL_DIG DBL_EPSILON DBL_MANT_DIG DBL_MAX DBL_MAX_10_EXP DBL_MAX_EXP DBL_MIN DBL_MIN_10_EXP DBL_MIN_EXP FLT_DIG FLT_EPSILON FLT_MANT_DIG FLT_MAX FLT_MAX_10_EXP FLT_MAX_EXP FLT_MIN FLT_MIN_10_EXP FLT_MIN_EXP FLT_RADIX FLT_ROUNDS LDBL_DIG LDBL_EPSILON LDBL_MANT_DIG LDBL_MAX LDBL_MAX_10_EXP LDBL_MAX_EXP LDBL_MIN LDBL_MIN_10_EXP LDBL_MIN_EXP
LIMITS
- Constants
- ARG_MAX CHAR_BIT CHAR_MAX CHAR_MIN CHILD_MAX INT_MAX INT_MIN LINK_MAX LONG_MAX LONG_MIN MAX_CANON MAX_INPUT MB_LEN_MAX NAME_MAX NGROUPS_MAX OPEN_MAX PATH_MAX PIPE_BUF SCHAR_MAX SCHAR_MIN SHRT_MAX SHRT_MIN SSIZE_MAX STREAM_MAX TZNAME_MAX UCHAR_MAX UINT_MAX ULONG_MAX USHRT_MAX
LOCALE
- Constants
- LC_ALL LC_COLLATE LC_CTYPE LC_MONETARY LC_NUMERIC LC_TIME
MATH
- Constants
- HUGE_VAL
SIGNAL
- Constants
- SA_NOCLDSTOP SA_NOCLDWAIT SA_NODEFER SA_ONSTACK SA_RESETHAND SA_RESTART SA_SIGINFO SIGABRT SIGALRM SIGCHLD SIGCONT SIGFPE SIGHUP SIGILL SIGINT SIGKILL SIGPIPE SIGQUIT SIGSEGV SIGSTOP SIGTERM SIGTSTP SIGTTIN SIGTTOU SIGUSR1 SIGUSR2 SIG_BLOCK SIG_DFL SIG_ERR SIG_IGN SIG_SETMASK SIG_UNBLOCK