1package POSIX; 2use strict; 3use warnings; 4 5our ($AUTOLOAD, %SIGRT); 6 7our $VERSION = '1.38_03'; 8 9require XSLoader; 10 11use Fcntl qw(FD_CLOEXEC F_DUPFD F_GETFD F_GETFL F_GETLK F_RDLCK F_SETFD 12 F_SETFL F_SETLK F_SETLKW F_UNLCK F_WRLCK O_ACCMODE O_APPEND 13 O_CREAT O_EXCL O_NOCTTY O_NONBLOCK O_RDONLY O_RDWR O_TRUNC 14 O_WRONLY SEEK_CUR SEEK_END SEEK_SET 15 S_ISBLK S_ISCHR S_ISDIR S_ISFIFO S_ISREG 16 S_IRGRP S_IROTH S_IRUSR S_IRWXG S_IRWXO S_IRWXU S_ISGID S_ISUID 17 S_IWGRP S_IWOTH S_IWUSR S_IXGRP S_IXOTH S_IXUSR); 18 19my $loaded; 20 21sub import { 22 my $pkg = shift; 23 24 load_imports() unless $loaded++; 25 26 # Grandfather old foo_h form to new :foo_h form 27 s/^(?=\w+_h$)/:/ for my @list = @_; 28 29 local $Exporter::ExportLevel = 1; 30 Exporter::import($pkg,@list); 31} 32 33sub croak { require Carp; goto &Carp::croak } 34sub usage { croak "Usage: POSIX::$_[0]" } 35 36XSLoader::load(); 37 38my %replacement = ( 39 atexit => 'END {}', 40 atof => undef, 41 atoi => undef, 42 atol => undef, 43 bsearch => \'not supplied', 44 calloc => undef, 45 clearerr => 'IO::Handle::clearerr', 46 div => '/, % and int', 47 execl => undef, 48 execle => undef, 49 execlp => undef, 50 execv => undef, 51 execve => undef, 52 execvp => undef, 53 fclose => 'IO::Handle::close', 54 fdopen => 'IO::Handle::new_from_fd', 55 feof => 'IO::Handle::eof', 56 ferror => 'IO::Handle::error', 57 fflush => 'IO::Handle::flush', 58 fgetc => 'IO::Handle::getc', 59 fgetpos => 'IO::Seekable::getpos', 60 fgets => 'IO::Handle::gets', 61 fileno => 'IO::Handle::fileno', 62 fopen => 'IO::File::open', 63 fprintf => 'printf', 64 fputc => 'print', 65 fputs => 'print', 66 fread => 'read', 67 free => undef, 68 freopen => 'open', 69 fscanf => '<> and regular expressions', 70 fseek => 'IO::Seekable::seek', 71 fsetpos => 'IO::Seekable::setpos', 72 fsync => 'IO::Handle::sync', 73 ftell => 'IO::Seekable::tell', 74 fwrite => 'print', 75 labs => 'abs', 76 ldiv => '/, % and int', 77 longjmp => 'die', 78 malloc => undef, 79 memchr => 'index()', 80 memcmp => 'eq', 81 memcpy => '=', 82 memmove => '=', 83 memset => 'x', 84 offsetof => undef, 85 putc => 'print', 86 putchar => 'print', 87 puts => 'print', 88 qsort => 'sort', 89 rand => \'non-portable, use Perl\'s rand instead', 90 realloc => undef, 91 scanf => '<> and regular expressions', 92 setbuf => 'IO::Handle::setbuf', 93 setjmp => 'eval {}', 94 setvbuf => 'IO::Handle::setvbuf', 95 siglongjmp => 'die', 96 sigsetjmp => 'eval {}', 97 srand => \'not supplied; refer to Perl\'s srand documentation', 98 sscanf => 'regular expressions', 99 strcat => '.=', 100 strchr => 'index()', 101 strcmp => 'eq', 102 strcpy => '=', 103 strcspn => 'regular expressions', 104 strlen => 'length', 105 strncat => '.=', 106 strncmp => 'eq', 107 strncpy => '=', 108 strpbrk => undef, 109 strrchr => 'rindex()', 110 strspn => undef, 111 strtok => undef, 112 tmpfile => 'IO::File::new_tmpfile', 113 ungetc => 'IO::Handle::ungetc', 114 vfprintf => undef, 115 vprintf => undef, 116 vsprintf => undef, 117); 118 119my %reimpl = ( 120 assert => 'expr => croak "Assertion failed" if !$_[0]', 121 tolower => 'string => lc($_[0])', 122 toupper => 'string => uc($_[0])', 123 closedir => 'dirhandle => CORE::closedir($_[0])', 124 opendir => 'directory => my $dh; CORE::opendir($dh, $_[0]) ? $dh : undef', 125 readdir => 'dirhandle => CORE::readdir($_[0])', 126 rewinddir => 'dirhandle => CORE::rewinddir($_[0])', 127 errno => '$! + 0', 128 creat => 'filename, mode => &open($_[0], &O_WRONLY | &O_CREAT | &O_TRUNC, $_[1])', 129 fcntl => 'filehandle, cmd, arg => CORE::fcntl($_[0], $_[1], $_[2])', 130 getgrgid => 'gid => CORE::getgrgid($_[0])', 131 getgrnam => 'name => CORE::getgrnam($_[0])', 132 atan2 => 'x, y => CORE::atan2($_[0], $_[1])', 133 cos => 'x => CORE::cos($_[0])', 134 exp => 'x => CORE::exp($_[0])', 135 fabs => 'x => CORE::abs($_[0])', 136 log => 'x => CORE::log($_[0])', 137 pow => 'x, exponent => $_[0] ** $_[1]', 138 sin => 'x => CORE::sin($_[0])', 139 sqrt => 'x => CORE::sqrt($_[0])', 140 getpwnam => 'name => CORE::getpwnam($_[0])', 141 getpwuid => 'uid => CORE::getpwuid($_[0])', 142 kill => 'pid, sig => CORE::kill $_[1], $_[0]', 143 raise => 'sig => CORE::kill $_[0], $$; # Is this good enough', 144 getc => 'handle => CORE::getc($_[0])', 145 getchar => 'CORE::getc(STDIN)', 146 gets => 'scalar <STDIN>', 147 remove => 'filename => (-d $_[0]) ? CORE::rmdir($_[0]) : CORE::unlink($_[0])', 148 rename => 'oldfilename, newfilename => CORE::rename($_[0], $_[1])', 149 rewind => 'filehandle => CORE::seek($_[0],0,0)', 150 abs => 'x => CORE::abs($_[0])', 151 exit => 'status => CORE::exit($_[0])', 152 getenv => 'name => $ENV{$_[0]}', 153 system => 'command => CORE::system($_[0])', 154 strerror => 'errno => local $! = $_[0]; "$!"', 155 strstr => 'big, little => CORE::index($_[0], $_[1])', 156 chmod => 'mode, filename => CORE::chmod($_[0], $_[1])', 157 fstat => 'fd => CORE::open my $dup, "<&", $_[0]; CORE::stat($dup)', # Gross. 158 mkdir => 'directoryname, mode => CORE::mkdir($_[0], $_[1])', 159 stat => 'filename => CORE::stat($_[0])', 160 umask => 'mask => CORE::umask($_[0])', 161 wait => 'CORE::wait()', 162 waitpid => 'pid, options => CORE::waitpid($_[0], $_[1])', 163 gmtime => 'time => CORE::gmtime($_[0])', 164 localtime => 'time => CORE::localtime($_[0])', 165 time => 'CORE::time', 166 alarm => 'seconds => CORE::alarm($_[0])', 167 chdir => 'directory => CORE::chdir($_[0])', 168 chown => 'uid, gid, filename => CORE::chown($_[0], $_[1], $_[2])', 169 fork => 'CORE::fork', 170 getegid => '$) + 0', 171 geteuid => '$> + 0', 172 getgid => '$( + 0', 173 getgroups => 'my %seen; grep !$seen{$_}++, split " ", $)', 174 getlogin => 'CORE::getlogin()', 175 getpgrp => 'CORE::getpgrp', 176 getpid => '$$', 177 getppid => 'CORE::getppid', 178 getuid => '$<', 179 isatty => 'filehandle => -t $_[0]', 180 link => 'oldfilename, newfilename => CORE::link($_[0], $_[1])', 181 rmdir => 'directoryname => CORE::rmdir($_[0])', 182 unlink => 'filename => CORE::unlink($_[0])', 183 utime => 'filename, atime, mtime => CORE::utime($_[1], $_[2], $_[0])', 184); 185 186eval join ';', map "sub $_", keys %replacement, keys %reimpl; 187 188sub AUTOLOAD { 189 my ($func) = ($AUTOLOAD =~ /.*::(.*)/); 190 191 die "POSIX.xs has failed to load\n" if $func eq 'constant'; 192 193 if (my $code = $reimpl{$func}) { 194 my ($num, $arg) = (0, ''); 195 if ($code =~ s/^(.*?) *=> *//) { 196 $arg = $1; 197 $num = 1 + $arg =~ tr/,//; 198 } 199 # no warnings to be consistent with the old implementation, where each 200 # function was in its own little AutoSplit world: 201 eval qq{ sub $func { 202 no warnings; 203 usage "$func($arg)" if \@_ != $num; 204 $code 205 } }; 206 no strict; 207 goto &$AUTOLOAD; 208 } 209 if (exists $replacement{$func}) { 210 my $how = $replacement{$func}; 211 croak "Unimplemented: POSIX::$func() is C-specific, stopped" 212 unless defined $how; 213 croak "Unimplemented: POSIX::$func() is $$how" if ref $how; 214 croak "Use method $how() instead of POSIX::$func()" if $how =~ /::/; 215 croak "Unimplemented: POSIX::$func() is C-specific: use $how instead"; 216 } 217 218 constant($func); 219} 220 221sub perror { 222 print STDERR "@_: " if @_; 223 print STDERR $!,"\n"; 224} 225 226sub printf { 227 usage "printf(pattern, args...)" if @_ < 1; 228 CORE::printf STDOUT @_; 229} 230 231sub sprintf { 232 usage "sprintf(pattern, args...)" if @_ == 0; 233 CORE::sprintf(shift,@_); 234} 235 236sub load_imports { 237our %EXPORT_TAGS = ( 238 239 assert_h => [qw(assert NDEBUG)], 240 241 ctype_h => [qw(isalnum isalpha iscntrl isdigit isgraph islower 242 isprint ispunct isspace isupper isxdigit tolower toupper)], 243 244 dirent_h => [], 245 246 errno_h => [qw(E2BIG EACCES EADDRINUSE EADDRNOTAVAIL EAFNOSUPPORT EAGAIN 247 EALREADY EBADF EBADMSG EBUSY ECANCELED ECHILD ECONNABORTED 248 ECONNREFUSED ECONNRESET EDEADLK EDESTADDRREQ EDOM EDQUOT EEXIST 249 EFAULT EFBIG EHOSTDOWN EHOSTUNREACH EIDRM EILSEQ EINPROGRESS 250 EINTR EINVAL EIO EISCONN EISDIR ELOOP EMFILE EMLINK EMSGSIZE 251 ENAMETOOLONG ENETDOWN ENETRESET ENETUNREACH ENFILE ENOBUFS 252 ENODATA ENODEV ENOENT ENOEXEC ENOLCK ENOLINK ENOMEM ENOMSG 253 ENOPROTOOPT ENOSPC ENOSR ENOSTR ENOSYS ENOTBLK ENOTCONN ENOTDIR 254 ENOTEMPTY ENOTRECOVERABLE ENOTSOCK ENOTSUP ENOTTY ENXIO 255 EOPNOTSUPP EOTHER EOVERFLOW EOWNERDEAD EPERM EPFNOSUPPORT EPIPE 256 EPROCLIM EPROTO EPROTONOSUPPORT EPROTOTYPE ERANGE EREMOTE 257 ERESTART EROFS ESHUTDOWN ESOCKTNOSUPPORT ESPIPE ESRCH ESTALE 258 ETIME ETIMEDOUT ETOOMANYREFS ETXTBSY EUSERS EWOULDBLOCK EXDEV 259 errno)], 260 261 fcntl_h => [qw(FD_CLOEXEC F_DUPFD F_GETFD F_GETFL F_GETLK F_RDLCK 262 F_SETFD F_SETFL F_SETLK F_SETLKW F_UNLCK F_WRLCK 263 O_ACCMODE O_APPEND O_CREAT O_EXCL O_NOCTTY O_NONBLOCK 264 O_RDONLY O_RDWR O_TRUNC O_WRONLY 265 creat 266 SEEK_CUR SEEK_END SEEK_SET 267 S_IRGRP S_IROTH S_IRUSR S_IRWXG S_IRWXO S_IRWXU 268 S_ISBLK S_ISCHR S_ISDIR S_ISFIFO S_ISGID S_ISREG S_ISUID 269 S_IWGRP S_IWOTH S_IWUSR)], 270 271 float_h => [qw(DBL_DIG DBL_EPSILON DBL_MANT_DIG 272 DBL_MAX DBL_MAX_10_EXP DBL_MAX_EXP 273 DBL_MIN DBL_MIN_10_EXP DBL_MIN_EXP 274 FLT_DIG FLT_EPSILON FLT_MANT_DIG 275 FLT_MAX FLT_MAX_10_EXP FLT_MAX_EXP 276 FLT_MIN FLT_MIN_10_EXP FLT_MIN_EXP 277 FLT_RADIX FLT_ROUNDS 278 LDBL_DIG LDBL_EPSILON LDBL_MANT_DIG 279 LDBL_MAX LDBL_MAX_10_EXP LDBL_MAX_EXP 280 LDBL_MIN LDBL_MIN_10_EXP LDBL_MIN_EXP)], 281 282 grp_h => [], 283 284 limits_h => [qw( ARG_MAX CHAR_BIT CHAR_MAX CHAR_MIN CHILD_MAX 285 INT_MAX INT_MIN LINK_MAX LONG_MAX LONG_MIN MAX_CANON 286 MAX_INPUT MB_LEN_MAX NAME_MAX NGROUPS_MAX OPEN_MAX 287 PATH_MAX PIPE_BUF SCHAR_MAX SCHAR_MIN SHRT_MAX SHRT_MIN 288 SSIZE_MAX STREAM_MAX TZNAME_MAX UCHAR_MAX UINT_MAX 289 ULONG_MAX USHRT_MAX _POSIX_ARG_MAX _POSIX_CHILD_MAX 290 _POSIX_LINK_MAX _POSIX_MAX_CANON _POSIX_MAX_INPUT 291 _POSIX_NAME_MAX _POSIX_NGROUPS_MAX _POSIX_OPEN_MAX 292 _POSIX_PATH_MAX _POSIX_PIPE_BUF _POSIX_SSIZE_MAX 293 _POSIX_STREAM_MAX _POSIX_TZNAME_MAX)], 294 295 locale_h => [qw(LC_ALL LC_COLLATE LC_CTYPE LC_MESSAGES 296 LC_MONETARY LC_NUMERIC LC_TIME NULL 297 localeconv setlocale)], 298 299 math_h => [qw(HUGE_VAL acos asin atan ceil cosh fabs floor fmod 300 frexp ldexp log10 modf pow sinh tan tanh)], 301 302 pwd_h => [], 303 304 setjmp_h => [qw(longjmp setjmp siglongjmp sigsetjmp)], 305 306 signal_h => [qw(SA_NOCLDSTOP SA_NOCLDWAIT SA_NODEFER SA_ONSTACK 307 SA_RESETHAND SA_RESTART SA_SIGINFO SIGABRT SIGALRM 308 SIGCHLD SIGCONT SIGFPE SIGHUP SIGILL SIGINT SIGKILL 309 SIGPIPE %SIGRT SIGRTMIN SIGRTMAX SIGQUIT SIGSEGV SIGSTOP 310 SIGTERM SIGTSTP SIGTTIN SIGTTOU SIGUSR1 SIGUSR2 SIGBUS 311 SIGPOLL SIGPROF SIGSYS SIGTRAP SIGURG SIGVTALRM SIGXCPU SIGXFSZ 312 SIG_BLOCK SIG_DFL SIG_ERR SIG_IGN SIG_SETMASK SIG_UNBLOCK 313 raise sigaction signal sigpending sigprocmask sigsuspend)], 314 315 stdarg_h => [], 316 317 stddef_h => [qw(NULL offsetof)], 318 319 stdio_h => [qw(BUFSIZ EOF FILENAME_MAX L_ctermid L_cuserid 320 L_tmpname NULL SEEK_CUR SEEK_END SEEK_SET 321 STREAM_MAX TMP_MAX stderr stdin stdout 322 clearerr fclose fdopen feof ferror fflush fgetc fgetpos 323 fgets fopen fprintf fputc fputs fread freopen 324 fscanf fseek fsetpos ftell fwrite getchar gets 325 perror putc putchar puts remove rewind 326 scanf setbuf setvbuf sscanf tmpfile tmpnam 327 ungetc vfprintf vprintf vsprintf)], 328 329 stdlib_h => [qw(EXIT_FAILURE EXIT_SUCCESS MB_CUR_MAX NULL RAND_MAX 330 abort atexit atof atoi atol bsearch calloc div 331 free getenv labs ldiv malloc mblen mbstowcs mbtowc 332 qsort realloc strtod strtol strtoul wcstombs wctomb)], 333 334 string_h => [qw(NULL memchr memcmp memcpy memmove memset strcat 335 strchr strcmp strcoll strcpy strcspn strerror strlen 336 strncat strncmp strncpy strpbrk strrchr strspn strstr 337 strtok strxfrm)], 338 339 sys_stat_h => [qw(S_IRGRP S_IROTH S_IRUSR S_IRWXG S_IRWXO S_IRWXU 340 S_ISBLK S_ISCHR S_ISDIR S_ISFIFO S_ISGID S_ISREG 341 S_ISUID S_IWGRP S_IWOTH S_IWUSR S_IXGRP S_IXOTH S_IXUSR 342 fstat mkfifo)], 343 344 sys_times_h => [], 345 346 sys_types_h => [], 347 348 sys_utsname_h => [qw(uname)], 349 350 sys_wait_h => [qw(WEXITSTATUS WIFEXITED WIFSIGNALED WIFSTOPPED 351 WNOHANG WSTOPSIG WTERMSIG WUNTRACED)], 352 353 termios_h => [qw( B0 B110 B1200 B134 B150 B1800 B19200 B200 B2400 354 B300 B38400 B4800 B50 B600 B75 B9600 BRKINT CLOCAL 355 CREAD CS5 CS6 CS7 CS8 CSIZE CSTOPB ECHO ECHOE ECHOK 356 ECHONL HUPCL ICANON ICRNL IEXTEN IGNBRK IGNCR IGNPAR 357 INLCR INPCK ISIG ISTRIP IXOFF IXON NCCS NOFLSH OPOST 358 PARENB PARMRK PARODD TCIFLUSH TCIOFF TCIOFLUSH TCION 359 TCOFLUSH TCOOFF TCOON TCSADRAIN TCSAFLUSH TCSANOW 360 TOSTOP VEOF VEOL VERASE VINTR VKILL VMIN VQUIT VSTART 361 VSTOP VSUSP VTIME 362 cfgetispeed cfgetospeed cfsetispeed cfsetospeed tcdrain 363 tcflow tcflush tcgetattr tcsendbreak tcsetattr )], 364 365 time_h => [qw(CLK_TCK CLOCKS_PER_SEC NULL asctime clock ctime 366 difftime mktime strftime tzset tzname)], 367 368 unistd_h => [qw(F_OK NULL R_OK SEEK_CUR SEEK_END SEEK_SET 369 STDERR_FILENO STDIN_FILENO STDOUT_FILENO W_OK X_OK 370 _PC_CHOWN_RESTRICTED _PC_LINK_MAX _PC_MAX_CANON 371 _PC_MAX_INPUT _PC_NAME_MAX _PC_NO_TRUNC _PC_PATH_MAX 372 _PC_PIPE_BUF _PC_VDISABLE _POSIX_CHOWN_RESTRICTED 373 _POSIX_JOB_CONTROL _POSIX_NO_TRUNC _POSIX_SAVED_IDS 374 _POSIX_VDISABLE _POSIX_VERSION _SC_ARG_MAX 375 _SC_CHILD_MAX _SC_CLK_TCK _SC_JOB_CONTROL 376 _SC_NGROUPS_MAX _SC_OPEN_MAX _SC_PAGESIZE _SC_SAVED_IDS 377 _SC_STREAM_MAX _SC_TZNAME_MAX _SC_VERSION 378 _exit access ctermid cuserid 379 dup2 dup execl execle execlp execv execve execvp 380 fpathconf fsync getcwd getegid geteuid getgid getgroups 381 getpid getuid isatty lseek pathconf pause setgid setpgid 382 setsid setuid sysconf tcgetpgrp tcsetpgrp ttyname)], 383 384 utime_h => [], 385); 386 387# Exporter::export_tags(); 388{ 389 # De-duplicate the export list: 390 my %export; 391 @export{map {@$_} values %EXPORT_TAGS} = (); 392 # Doing the de-dup with a temporary hash has the advantage that the SVs in 393 # @EXPORT are actually shared hash key scalars, which will save some memory. 394 our @EXPORT = keys %export; 395 396 our @EXPORT_OK = (qw(close lchown nice open pipe read sleep times write 397 printf sprintf), 398 grep {!exists $export{$_}} keys %reimpl, keys %replacement); 399} 400 401require Exporter; 402} 403 404package POSIX::SigAction; 405 406sub new { bless {HANDLER => $_[1], MASK => $_[2], FLAGS => $_[3] || 0, SAFE => 0}, $_[0] } 407sub handler { $_[0]->{HANDLER} = $_[1] if @_ > 1; $_[0]->{HANDLER} }; 408sub mask { $_[0]->{MASK} = $_[1] if @_ > 1; $_[0]->{MASK} }; 409sub flags { $_[0]->{FLAGS} = $_[1] if @_ > 1; $_[0]->{FLAGS} }; 410sub safe { $_[0]->{SAFE} = $_[1] if @_ > 1; $_[0]->{SAFE} }; 411 412{ 413package POSIX::SigSet; 414# This package is here entirely to make sure that POSIX::SigSet is seen by the 415# PAUSE indexer, so that it will always be clearly indexed in core. This is to 416# prevent the accidental case where a third-party distribution can accidentally 417# claim the POSIX::SigSet package, as occurred in 2011-12. -- rjbs, 2011-12-30 418} 419 420package POSIX::SigRt; 421 422require Tie::Hash; 423 424our @ISA = 'Tie::StdHash'; 425 426our ($_SIGRTMIN, $_SIGRTMAX, $_sigrtn); 427 428our $SIGACTION_FLAGS = 0; 429 430sub _init { 431 $_SIGRTMIN = &POSIX::SIGRTMIN; 432 $_SIGRTMAX = &POSIX::SIGRTMAX; 433 $_sigrtn = $_SIGRTMAX - $_SIGRTMIN; 434} 435 436sub _croak { 437 &_init unless defined $_sigrtn; 438 die "POSIX::SigRt not available" unless defined $_sigrtn && $_sigrtn > 0; 439} 440 441sub _getsig { 442 &_croak; 443 my $rtsig = $_[0]; 444 # Allow (SIGRT)?MIN( + n)?, a common idiom when doing these things in C. 445 $rtsig = $_SIGRTMIN + ($1 || 0) 446 if $rtsig =~ /^(?:(?:SIG)?RT)?MIN(\s*\+\s*(\d+))?$/; 447 return $rtsig; 448} 449 450sub _exist { 451 my $rtsig = _getsig($_[1]); 452 my $ok = $rtsig >= $_SIGRTMIN && $rtsig <= $_SIGRTMAX; 453 ($rtsig, $ok); 454} 455 456sub _check { 457 my ($rtsig, $ok) = &_exist; 458 die "No POSIX::SigRt signal $_[1] (valid range SIGRTMIN..SIGRTMAX, or $_SIGRTMIN..$_SIGRTMAX)" 459 unless $ok; 460 return $rtsig; 461} 462 463sub new { 464 my ($rtsig, $handler, $flags) = @_; 465 my $sigset = POSIX::SigSet->new($rtsig); 466 my $sigact = POSIX::SigAction->new($handler, $sigset, $flags); 467 POSIX::sigaction($rtsig, $sigact); 468} 469 470sub EXISTS { &_exist } 471sub FETCH { my $rtsig = &_check; 472 my $oa = POSIX::SigAction->new(); 473 POSIX::sigaction($rtsig, undef, $oa); 474 return $oa->{HANDLER} } 475sub STORE { my $rtsig = &_check; new($rtsig, $_[2], $SIGACTION_FLAGS) } 476sub DELETE { delete $SIG{ &_check } } 477sub CLEAR { &_exist; delete @SIG{ &POSIX::SIGRTMIN .. &POSIX::SIGRTMAX } } 478sub SCALAR { &_croak; $_sigrtn + 1 } 479 480tie %POSIX::SIGRT, 'POSIX::SigRt'; 481# and the expression on the line above is true, so we return true. 482