Dubugging using gdb

spatlou

Debugging insertionSort.c Program using gdb

spatlou

gcc -g insertionSort.c -o isort

...

-g compiles the insertionSort.c for debugging

-o gives optional name for the compiled program. isort in this case.

Now we are going to start gdb:

[root@localhost Arrays]# gdb isort

GNU gdb (GDB) Fedora 8.0.1-36.fc27

License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software: you are free to change and redistribute it.

There is NO WARRANTY, to the extent permitted by law. Type "show copying"

and "show warranty" for details.

This GDB was configured as "x86_64-redhat-linux-gnu".

Type "show configuration" for configuration details.

For bug reporting instructions, please see:

<http://www.gnu.org/software/gdb/bugs/>.

Find the GDB manual and other documentation resources online at:

<http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".

Type "apropos word" to search for commands related to "word"...

Reading symbols from isort...done.

(gdb)

spatlou

(gdb)

...

This is the gdb prompt.

(gdb) break 25

Breakpoint 1 at 0x400699: file insertionSort.c, line 25.

...

... This puts the breakpoint at Line no 25 in out program.

... Now we can add commands to check variables in our program.

(gdb) commands

Type commands for breakpoint(s) 1, one per line.

End with a line saying just "end".

... Commands will expect you to type in some commands that you would like to use at the break point where your program breaks.

>print j

>print p

>print e

>print i

>print k

>print arr[0]@10

>end

(gdb)

.. I gave these commands as i wanted to see these variables. followed by end

spatlou

Now going to run

(gdb) run

Starting program: /home/EmbLogic/Training/Torsha/Arrays/isort

Missing separate debuginfos, use: dnf debuginfo-install glibc-2.26-30.fc27.x86_64

Enter Values in The Array

22

44

66

88

99

77

55

33

11

65

Breakpoint 1, main () at insertionSort.c:25

25 printf("\n");

$1 = 0

$2 = 1

$3 = 44

$4 = 1

$5 = 0

$6 = {44, 44, 66, 88, 99, 77, 55, 33, 11, 65}

spatlou

use cont

to continue

Dubugging using gdb

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