POSIX(3)

NAME
POSIX - Perl interface to IEEE Std 1003.1

SYNOPSIS

    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_CREAT|O_EXCL|O_WRONLY, 0644);
        # note: that's a filedescriptor, *NOT* a filehandle

DESCRIPTION
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 the perlfunc manpage 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. Use POSIX::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, use index() 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's mktime() 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 "C").

            $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 the setlocale(3) manpage documentation for the locale environment variables' meaning or consult the perllocale manpage.

            $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 the perllocale manpage 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 the action and oldaction arguments. Consult your system's sigaction 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 the sigset argument. Consult your system's sigpending 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 the sigset and oldsigset arguments. Consult your system's sigprocmask 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 the signal_mask argument. Consult your system's sigsuspend 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, use index() 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 = -1, yday = -1, isdst = -1)
    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's strftime() manpage for details about these and the other arguments. The given arguments are made consistent by calling mktime() before calling your system's strftime() function.

    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, use rindex() 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 C struct 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 a POSIX::SigSet object, it defaults to the empty set. The third parameter contains the sa_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 the POSIX::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, and setattr() 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

STAT

Constants
    S_IRGRP S_IROTH S_IRUSR S_IRWXG S_IRWXO S_IRWXU S_ISGID S_ISUID S_IWGRP S_IWOTH S_IWUSR S_IXGRP S_IXOTH S_IXUSR

Macros
    S_ISBLK S_ISCHR S_ISDIR S_ISFIFO S_ISREG

STDLIB

Constants
    EXIT_FAILURE EXIT_SUCCESS MB_CUR_MAX RAND_MAX

STDIO

Constants
    BUFSIZ EOF FILENAME_MAX L_ctermid L_cuserid L_tmpname TMP_MAX

TIME

Constants
    CLK_TCK CLOCKS_PER_SEC

UNISTD

Constants
    R_OK SEEK_CUR SEEK_END SEEK_SET STDIN_FILENO STDOUT_FILENO STRERR_FILENO W_OK X_OK

WAIT

Constants
    WNOHANG WUNTRACED

Macros
    WIFEXITED WEXITSTATUS WIFSIGNALED WTERMSIG WIFSTOPPED WSTOPSIG

CREATION
This document generated by ./mkposixman.PL version 19960129.