gdb

user@localhost:~/Documents/MOS/LAB3> gcc -g ourcat.c -o ourcat.out
user@localhost:~/Documents/MOS/LAB3> gdb -quiet ourcat.out
Reading symbols from ourcat.out...done.
(gdb) break printFile
Breakpoint 1 at 0x400689: file ourcat.c, line 23.
(gdb) break 26
Breakpoint 2 at 0x4006ef: file ourcat.c, line 26.
(gdb) run 1.txt 2.txt
Starting program: /home/user/Documents/MOS/LAB3/ourcat.out 1.txt 2.txt
Missing separate debuginfo for /lib64/ld-linux-x86-64.so.2
Try: zypper install -C "debuginfo(build-id)=eb2c8c73c3e72388ba2922084444fdb2b7c592ba"
Missing separate debuginfo for /lib64/libc.so.6
Try: zypper install -C "debuginfo(build-id)=d15eed2af0706b9f841d2d763796fef6e5a63aec"

Breakpoint 1, printFile (fileName=0x7fffffffe2d2 "1.txt") at ourcat.c:23
23      void printFile(char* fileName) {
(gdb) c
Continuing.

Breakpoint 2, printFile (fileName=0x7fffffffe2d2 "1.txt") at ourcat.c:26
26          int  fileDesc = open(fileName, O_RDONLY);
(gdb) watch readBytes
Hardware watchpoint 3: readBytes
(gdb) c
Continuing.

Hardware watchpoint 3: readBytes

Old value = 0
New value = 5
0x0000000000400752 in printFile (fileName=0x7fffffffe2d2 "1.txt") at ourcat.c:27
27          while ((readBytes = read(fileDesc, buffer, BUFFER_SIZE)) > 0) {
(gdb) print fileName
$1 = 0x7fffffffe2d2 "1.txt"
(gdb) c
Continuing.
1234

Hardware watchpoint 3: readBytes

Old value = 5
New value = 0
0x0000000000400752 in printFile (fileName=0x7fffffffe2d2 "1.txt") at ourcat.c:27
27          while ((readBytes = read(fileDesc, buffer, BUFFER_SIZE)) > 0) {
(gdb) delete
Delete all breakpoints? (y or n) y
(gdb) c
Continuing.
45678
[Inferior 1 (process 14043) exited normally]
(gdb) exit
Undefined command: "exit".  Try "help".
(gdb) quit