AT&T UNIX™PC Unix System V Users Manual - tenox

SDB(l) SDB(l)
V Print the version number.
Q Print a list of procedures and files being debugged.
Y Toggle debug output.
Sdb may be instructed to monitor a given memory location and
stop the program when the value at that location changes in a
given way. For example:
>if X =, or !=.
off n Disables or turns off a data breakpoint without removing
it from the list.
on n Enables a breakpoint that was turned off.
out n Removes a breakpoint from the list.
Conditional breakpoints are used in a manner similar to data
breakpoints, except that the user specifies a place in the program
at which sdb should stop to check the data values. For example,
mysub:99 b if xyz = 123
The above example instructs sdb to check the value of xyz every
time the program arrives at line 99 of subroutine mysub. If the
condition is true, then execution stops there, as with a normal
breakpoint. This type of breakpoint does not monitor the value
xyz at every line of code, as the data breakpoint does.
FILES
a.out
core
SEE ALSO
cc( l), sh( 1), a.out(4), core(4).
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