diff options
Diffstat (limited to 'pod/perlfaq8.pod')
| -rw-r--r-- | pod/perlfaq8.pod | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/pod/perlfaq8.pod b/pod/perlfaq8.pod index 7250afbca5..bc8412bf6f 100644 --- a/pod/perlfaq8.pod +++ b/pod/perlfaq8.pod @@ -104,7 +104,7 @@ give the numeric values you want directly, using octal ("\015"), hex Even though with normal text files, a "\n" will do the trick, there is still no unified scheme for terminating a line that is portable -between Unix, DOS/Win, and Macintosh, except to terminate I<ALL> line +between Unix, MS-DOS/Windows, and Macintosh, except to terminate I<ALL> line ends with "\015\012", and strip what you don't need from the output. This applies especially to socket I/O and autoflushing, discussed next. @@ -208,7 +208,7 @@ You don't actually "trap" a control character. Instead, that character generates a signal, which you then trap. Signals are documented in L<perlipc/"Signals"> and chapter 6 of the Camel. -Be warned that very few C libraries are re-entrant. Therefore, if you +Be warned that very few C libraries are reentrant. Therefore, if you attempt to print() in a handler that got invoked during another stdio operation your internal structures will likely be in an inconsistent state, and your program will dump core. You can @@ -230,7 +230,7 @@ For example: However, because syscalls restart by default, you'll find that if you're in a "slow" call, such as E<lt>FHE<gt>, read(), connect(), or wait(), that the only way to terminate them is by "longjumping" out; -that is, by raising an exception. See the time-out handler for a +that is, by raising an exception. See the timeout handler for a blocking flock() in L<perlipc/"Signals"> or chapter 6 of the Camel. =head2 How do I modify the shadow password file on a Unix system? @@ -267,7 +267,7 @@ http://www.perl.com/CPAN/doc/misc/ancient/tutorial/eg/itimers.pl . =head2 How can I measure time under a second? In general, you may not be able to. The Time::HiRes module (available -from CPAN) provides this functionality for some systems. +from CPAN) provides this functionality for some systems. In general, you may not be able to. But if you system supports both the syscall() function in Perl as well as a system call like gettimeofday(2), @@ -311,7 +311,7 @@ END blocks you should also use Perl's exception-handling mechanism is its eval() operator. You can use eval() as setjmp and die() as longjmp. For details of this, see -the section on signals, especially the time-out handler for a blocking +the section on signals, especially the timeout handler for a blocking flock() in L<perlipc/"Signals"> and chapter 6 of the Camel. If exception handling is all you're interested in, try the @@ -352,7 +352,7 @@ Simple files like F<errno.h>, F<syscall.h>, and F<socket.h> were fine, but the hard ones like F<ioctl.h> nearly always need to hand-edited. Here's how to install the *.ph files: - 1. become super-user + 1. become superuser 2. cd /usr/include 3. h2ph *.h */*.h @@ -513,7 +513,7 @@ You have to do this: Just as with system(), no shell escapes happen when you exec() a list. -=head2 Why can't my script read from STDIN after I gave it EOF (^D on Unix, ^Z on MSDOS)? +=head2 Why can't my script read from STDIN after I gave it EOF (^D on Unix, ^Z on MS-DOS)? Because some stdio's set error and eof flags that need clearing. The POSIX module defines clearerr() that you can use. That is the @@ -552,7 +552,7 @@ Things that are awkward to do in the shell are easy to do in Perl, and this very awkwardness is what would make a shell->perl converter nigh-on impossible to write. By rewriting it, you'll think about what you're really trying to do, and hopefully will escape the shell's -pipeline datastream paradigm, which while convenient for some matters, +pipeline data stream paradigm, which while convenient for some matters, causes many inefficiencies. =head2 Can I use perl to run a telnet or ftp session? |