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Handling Signals
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Handling Signals
If your program contains a signal handler routine, you may need to adjust the
way TotalView handles signals. The following table shows how TotalView handles
UNIX signals if you do not tell it how to handle them:
Signals that TotalView Passes Back
to Your Program Signals that TotalView Treats as Errors
SIGHUP SIGIO SIGILL SIGPIPE
SIGINT SIGIO SIGTRAP SIGTERM
SIGQUIT SIGPROF SIGIOT SIGTSTP
SIGKILL SIGWINCH SIGEMT SIGTTIN
SIGALRM SIGLOST SIGFPE SIGTTOU
SIGURG SIGUSR1 SIGBUS SIGXCPU
SIGCONT SIGUSR2 SIGSEGV SIGXFSZ
SIGCHLD SIGSYS
TotalView uses the SIGTRAP and SIGSTOP signals internally. If a process receives either
of these signals, TotalView neither stops the process with an error nor passes the signal
back to your program. You cannot alter the way TotalView uses these signals.
On some systems, hardware registers affect how TotalView and your program
handle signals such as SIGFPE. For more information, see “Interpreting
the Status and Control Registers” on page 250 of this manual and the “Architectures”
chapter in the TotalView Reference Guide.
On an SGI computer, setting the TRAP_FPE environment variable to any value indicates
that your program traps underflow errors. If you set this variable, however, you
also need to use the controls in the File > Signals Dialog Box to indicate what
TotalView should do with SIGFPE errors. (In most cases, you set SIGFPE to Resend.)
You can change the signal handling mode using the File > Signals command.
(See Figure 63.)
CLI: dset TV::signal_handling_mode
The signal names and numbers that TotalView displays are platform-specific.
That is, what you see in this box depends on the computer and operating
system in which your program is executing.
You can change the default way in which TotalView handles a signal by setting
the TV::signal_handling_mode variable in a .tvdrc startup file. For more
information, see Chapter 4 of the “TotalView Reference Guide.”
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