z/OS V1R9.0 UNIX System Services Command ... - Christian Grothoff

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dbx
Files
Examples
The following operators are valid in expressions:
Expression Operators
exp (exponentiation) Algebraic + (addition), - (subtraction), *
(multiplication), / (floating point division),
div (integral division), mod (modulo
division), exp (exponentiation)
Bitwise ? (unary minus), ? (bitwise or), & (bitwise
and), ? (bitwise xor), ~ (one’s
complement), >
(bitwise right shift), bitand (bitwise and),
xor (bitwise xor)
Logical ?? (logical or), && (logical and), ! (logical
not), or, and, not
Comparison < (less than), > (greater than), = (greater than or
equal to), (not equal to), != (not equal
to), = (equal to), == (equal to)
Other sizeof
a.out The object file a.out is the default name of an executable file produced by
the compiler. If no executable is specified on the dbx command line, then
dbx will look for an a.out file to debug.
.dbxinit
Contains initial commands.
.dbxsetup
Contains initial commands.
.dbxhistory
Contains a listing of recently used dbx commands. Used by the history dbx
subcommand.
1. This example shows you how to attach dbx to a running process. To do this, it
is useful to insert a sleep(30) call into the program to be debugged. This will
give you enough time to issue the ps -Aef shell command to find the process ID
of the program. Once you have the process id, issue the shell command: dbx -a
process-id.
Before starting the server, set the following environment variable to have all
DLLs and executables loaded into read/write storage:
export _BPX_PTRACE_ATTACH=yes
You must also ensure that the following environment variable is set before
invoking dbx. This ensures that Language Environment notifies dbx of important
program events.
export _CEE_RUNOPTS="test(all)"
Use dbx commands to set breakpoints, step through program statements, print
variables, work with threads, examine storage, and actions as needed.
2. Example of creating .dbxinit file in your home directory:
186 z/OS V1R9.0 UNIX System Services Command Reference