Attachment 11661 Details for Bug 25668 – Extract from a gdb session based on a tutorial.

Extract from a gdb session based on a tutorial.

tutorial (text/plain), 3.94 KB, created by Len Lawrence on 2020-05-25 19:52:30 CEST

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Creator: Len Lawrence

Created: 2020-05-25 19:52:30 CEST

Size: 3.94 KB

patch

obsolete

>$ gdb gfg
>(gdb) break findSquare
>Breakpoint 1 at 0x401179: file gfg.cpp, line 9.
>(gdb) run 10 100
>Starting program: /data/qa/gdb/gfg 10 100
>Missing separate debuginfos, use: debuginfo-install glibc-2.29-20.mga7.x86_64
>
>Breakpoint 1, findSquare (a=10) at gfg.cpp:9
>9	    return a * a; 
>Missing separate debuginfos, use: debuginfo-install libgcc1-8.4.0-1.mga7.x86_64 libstdc++6-8.4.0-1.mga7.x86_64
>(gdb) continue
>Continuing.
>100
>
>Breakpoint 1, findSquare (a=100) at gfg.cpp:9
>9	    return a * a; 
>(gdb) c
>Continuing.
>10000
>[Inferior 1 (process 20955) exited normally]
>(gdb) run 1 10 100
>Starting program: /data/qa/gdb/gfg 1 10 100
>
>Breakpoint 1, findSquare (a=1) at gfg.cpp:9
>9	    return a * a; 
>(gdb) n
>10	} 
>(gdb) n
>1
>main (n=4, args=0x7fffffffd918) at gfg.cpp:14
>14	    for (int i = 1; i < n; i++)  
>.....
>main (n=4, args=0x7fffffffd918) at gfg.cpp:14
>14	    for (int i = 1; i < n; i++)  
>
>Restart:
>$ gdb gfg
>(gdb) b main
>Breakpoint 1 at 0x401191: file gfg.cpp, line 14.
>(gdb) b findSquare
>Breakpoint 2 at 0x401179: file gfg.cpp, line 9.
>(gdb) delete 2
>(gdb) run 10
>Starting program: /data/qa/gdb/gfg 10
>Missing separate debuginfos, use: debuginfo-install glibc-2.29-20.mga7.x86_64
>
>Breakpoint 1, main (n=2, args=0x7fffffffd938) at gfg.cpp:14
>14	    for (int i = 1; i < n; i++)  
>Missing separate debuginfos, use: debuginfo-install libgcc1-8.4.0-1.mga7.x86_64 libstdc++6-8.4.0-1.mga7.x86_64
>(gdb) c
>Continuing.
>100
>[Inferior 1 (process 22668) exited normally]
>(gdb) clear main
>Deleted breakpoint 1 
>(gdb) run 1
>Starting program: /data/qa/gdb/gfg 1
>1
>[Inferior 1 (process 22882) exited normally]
>(gdb) b findSquare
>Breakpoint 3 at 0x401179: file gfg.cpp, line 9.
>(gdb) info breakpoints
>Num     Type           Disp Enb Address            What
>3       breakpoint     keep y   0x0000000000401179 in findSquare(int) 
>                                                   at gfg.cpp:9
>(gdb) b main
>Breakpoint 4 at 0x401191: file gfg.cpp, line 14.
>(gdb) disable 3
>(gdb) info breakpoints
>Num     Type           Disp Enb Address            What
>3       breakpoint     keep n   0x0000000000401179 in findSquare(int) 
>                                                   at gfg.cpp:9
>4       breakpoint     keep y   0x0000000000401191 in main(int, char**) 
>                                                   at gfg.cpp:14
>(gdb) enable 3
>(gdb) info breakpoints
>Num     Type           Disp Enb Address            What
>3       breakpoint     keep y   0x0000000000401179 in findSquare(int) 
>                                                   at gfg.cpp:9
>4       breakpoint     keep y   0x0000000000401191 in main(int, char**) 
>                                                   at gfg.cpp:14
>
>Restart:
>$ gdb gfg
>(gdb) b findSquare
>Breakpoint 1 at 0x401179: file gfg.cpp, line 9.
>(gdb) b main
>Breakpoint 2 at 0x401191: file gfg.cpp, line 14.
>(gdb) run 1 10 100
>Starting program: /data/qa/gdb/gfg 1 10 100
>(gdb) checkpoint
>checkpoint 1: fork returned pid 24496.
>(gdb) continue
>Continuing.
>Breakpoint 1, findSquare (a=1) at gfg.cpp:9
>9	    return a * a; 
>(gdb) checkpoint
>checkpoint 2: fork returned pid 24562.
>(gdb) info checkpoints
>* 0 process 24352 (main process) at 0x0
>  1 process 24496 at 0x401191, file gfg.cpp, line 14
>  2 process 24562 at 0x401179, file gfg.cpp, line 9
>(gdb) restart 1
>Switching to process 24496
>#0  main (n=4, args=0x7fffffffd918) at gfg.cpp:14
>14	    for (int i = 1; i < n; i++)  
>(gdb) info checkpoints
>  0 process 24352 (main process) at 0x401179, file gfg.cpp, line 9
>* 1 process 24496 at 0x401191, file gfg.cpp, line 14
>  2 process 24562 at 0x401179, file gfg.cpp, line 9
>(gdb) restart 0
>Switching to process 24352
>#0  findSquare (a=1) at gfg.cpp:9
>9	    return a * a; 
>(gdb) restart 2
>Switching to process 24562
>#0  findSquare (a=1) at gfg.cpp:9
>9	    return a * a; 
>.....
>(gdb) c
>Continuing.
>10000
>[Inferior 1 (process 24496) exited normally]
>[Switching to process 24562]
>(gdb) info checkpoints
>  0 process 24352 (main process) at 0x401179, file gfg.cpp, line 9
>* 2 process 24562 at 0x401179, file gfg.cpp, line 9
>
>
>

$ gdb gfg
(gdb) break findSquare
Breakpoint 1 at 0x401179: file gfg.cpp, line 9.
(gdb) run 10 100
Starting program: /data/qa/gdb/gfg 10 100
Missing separate debuginfos, use: debuginfo-install glibc-2.29-20.mga7.x86_64

Breakpoint 1, findSquare (a=10) at gfg.cpp:9
9	    return a * a; 
Missing separate debuginfos, use: debuginfo-install libgcc1-8.4.0-1.mga7.x86_64 libstdc++6-8.4.0-1.mga7.x86_64
(gdb) continue
Continuing.
100

Breakpoint 1, findSquare (a=100) at gfg.cpp:9
9	    return a * a; 
(gdb) c
Continuing.
10000
[Inferior 1 (process 20955) exited normally]
(gdb) run 1 10 100
Starting program: /data/qa/gdb/gfg 1 10 100

Breakpoint 1, findSquare (a=1) at gfg.cpp:9
9	    return a * a; 
(gdb) n
10	} 
(gdb) n
1
main (n=4, args=0x7fffffffd918) at gfg.cpp:14
14	    for (int i = 1; i < n; i++)  
.....
main (n=4, args=0x7fffffffd918) at gfg.cpp:14
14	    for (int i = 1; i < n; i++)  

Restart:
$ gdb gfg
(gdb) b main
Breakpoint 1 at 0x401191: file gfg.cpp, line 14.
(gdb) b findSquare
Breakpoint 2 at 0x401179: file gfg.cpp, line 9.
(gdb) delete 2
(gdb) run 10
Starting program: /data/qa/gdb/gfg 10
Missing separate debuginfos, use: debuginfo-install glibc-2.29-20.mga7.x86_64

Breakpoint 1, main (n=2, args=0x7fffffffd938) at gfg.cpp:14
14	    for (int i = 1; i < n; i++)  
Missing separate debuginfos, use: debuginfo-install libgcc1-8.4.0-1.mga7.x86_64 libstdc++6-8.4.0-1.mga7.x86_64
(gdb) c
Continuing.
100
[Inferior 1 (process 22668) exited normally]
(gdb) clear main
Deleted breakpoint 1 
(gdb) run 1
Starting program: /data/qa/gdb/gfg 1
1
[Inferior 1 (process 22882) exited normally]
(gdb) b findSquare
Breakpoint 3 at 0x401179: file gfg.cpp, line 9.
(gdb) info breakpoints
Num     Type           Disp Enb Address            What
3       breakpoint     keep y   0x0000000000401179 in findSquare(int) 
                                                   at gfg.cpp:9
(gdb) b main
Breakpoint 4 at 0x401191: file gfg.cpp, line 14.
(gdb) disable 3
(gdb) info breakpoints
Num     Type           Disp Enb Address            What
3       breakpoint     keep n   0x0000000000401179 in findSquare(int) 
                                                   at gfg.cpp:9
4       breakpoint     keep y   0x0000000000401191 in main(int, char**) 
                                                   at gfg.cpp:14
(gdb) enable 3
(gdb) info breakpoints
Num     Type           Disp Enb Address            What
3       breakpoint     keep y   0x0000000000401179 in findSquare(int) 
                                                   at gfg.cpp:9
4       breakpoint     keep y   0x0000000000401191 in main(int, char**) 
                                                   at gfg.cpp:14

Restart:
$ gdb gfg
(gdb) b findSquare
Breakpoint 1 at 0x401179: file gfg.cpp, line 9.
(gdb) b main
Breakpoint 2 at 0x401191: file gfg.cpp, line 14.
(gdb) run 1 10 100
Starting program: /data/qa/gdb/gfg 1 10 100
(gdb) checkpoint
checkpoint 1: fork returned pid 24496.
(gdb) continue
Continuing.
Breakpoint 1, findSquare (a=1) at gfg.cpp:9
9	    return a * a; 
(gdb) checkpoint
checkpoint 2: fork returned pid 24562.
(gdb) info checkpoints
* 0 process 24352 (main process) at 0x0
  1 process 24496 at 0x401191, file gfg.cpp, line 14
  2 process 24562 at 0x401179, file gfg.cpp, line 9
(gdb) restart 1
Switching to process 24496
#0  main (n=4, args=0x7fffffffd918) at gfg.cpp:14
14	    for (int i = 1; i < n; i++)  
(gdb) info checkpoints
  0 process 24352 (main process) at 0x401179, file gfg.cpp, line 9
* 1 process 24496 at 0x401191, file gfg.cpp, line 14
  2 process 24562 at 0x401179, file gfg.cpp, line 9
(gdb) restart 0
Switching to process 24352
#0  findSquare (a=1) at gfg.cpp:9
9	    return a * a; 
(gdb) restart 2
Switching to process 24562
#0  findSquare (a=1) at gfg.cpp:9
9	    return a * a; 
.....
(gdb) c
Continuing.
10000
[Inferior 1 (process 24496) exited normally]
[Switching to process 24562]
(gdb) info checkpoints
  0 process 24352 (main process) at 0x401179, file gfg.cpp, line 9
* 2 process 24562 at 0x401179, file gfg.cpp, line 9

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Attachments on bug 25668: 11661