HP SunSoft Pascal 4.0 Uživatelský manuál stáhnout pdf (Strana 37)

Pascal Programs 13

Assuming that the ﬁle data is still in the current directory, you can compile

and run the program as follows:

Where Did My Program Fail?

SPARCompiler Pascal can trace why a program failed; its traceback utility

ﬁnds the routine that triggers the error.

Using Pascal Traceback

Pascal traceback installs signal handlers on selected signals and dumps a

backtrace when those signals are caught. The backtrace shows the chain of

calls leading from the routine in which the error occurred, all the way back to

the main program.

Pascal catches the following set of signals:

See the signal(3) man page for further information on these signals.

After the system produces the traceback, it continues with whatever action it

would have taken if the interposer had not been in place, including calling a

user signal handler that was previously set.

The traceback facility uses the debugger dbx. To obtain a traceback,

SPARCworks must be installed on your system, and the directory containing

dbx must be in your PATH environment variable. If the traceback routine

cannot ﬁnd dbx, it does not produce the traceback.

Use the -notrace command-line option to disable traceback.

hostname% pc -o copy2 copy2.p

hostname% copy2

hello, are you listening?

goodbye, I must go now.

SIGQUIT SIGIOT SIGFPE SIGSYS SIGTERM

SIGILL SIGABRT SIGBUS SIGPIPE SIGLOST

SIGTRAP SIGEMT

SIGSEGV

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 332 333

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HP SunSoft Pascal 4.0 Uživatelský manuál Strana 37