Date: Sun, 20 Aug 2000 09:28:42 +0200 From: "Eli Zaretskii" Sender: halo1 AT zahav DOT net DOT il To: kourino AT hotmail DOT com Message-Id: <1438-Sun20Aug2000092841+0300-eliz@is.elta.co.il> X-Mailer: Emacs 20.6 (via feedmail 8.2.emacs20_6 I) and Blat ver 1.8.5b CC: djgpp AT delorie DOT com In-reply-to: <399F3B95.585EC230@hotmail.com> (message from the Icefalcon on Sun, 20 Aug 2000 01:53:22 GMT) Subject: Re: SIGTSTP References: <399F3B95 DOT 585EC230 AT hotmail DOT com> Reply-To: djgpp AT delorie DOT com Errors-To: nobody AT delorie DOT com X-Mailing-List: djgpp AT delorie DOT com X-Unsubscribes-To: listserv AT delorie DOT com Precedence: bulk > From: the Icefalcon > Newsgroups: comp.os.msdos.djgpp > Date: Sun, 20 Aug 2000 01:53:22 GMT > > cl/cl_funcs.c uses it in the nvi source. A page describes it as "an > interactive stop signal" that can be handled or ignored (unlike > SIGSTOP), but in a different place it also says that the SUSP character > that usually causes SIGTSTP to be sent is "recognized only if the > implementation supports job control". I'm guessing DJGPP doesn't ... ? SIGTSTP is a signal that is generated when you press Ctrl-Z on a Unix terminal. (Ctrl-Z is the default SUSP character.) It causes the current program to be suspended, and switches to a background program (usually, the shell), until you type "fg" to resume the stopped program. DJGPP doesn't support SIGTSTP, although the termios emulation can emulate this by launching a subsidiary shell (you need to type "exit" to return). > For the > moment I'm just throwing in a -DSIGTSTP=SIGABRT to the makefile since > there's also no SIGSTOP (since no job control) ... This is safe, right? No, it isn't safe, unless you like your programs to crash ;-) SIGABRT aborts the program with a stack traceback, so it is not a good replacement for SIGTSTP. It's much better to define away the related code like this: #ifdef SIGTSTP ... code that uses SIGTSTP ... #endif Alternatively, you could use the termios emulation of SIGTSTP described above.