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Posted by / 10-Apr-2017 18:52

Gdb pipe dating

1 - if I set a break point - else if(pid == 0) - This is free software: you are free to change and redistribute it.

There is NO WARRANTY, to the extent permitted by law. (gdb) set detach-on-fork off (gdb) b fork Breakpoint 1 at 0x400710 (gdb) r Starting program: /tmp/% dddd Breakpoint 1, 0x00007ffff7ae0e04 in fork () from /lib64/6 Missing separate debuginfos, use: debuginfo-install glibc-2.18-9.11.mga4.x86_64 (gdb) bt #0 0x00007ffff7ae0e04 in fork () from /lib64/6 #1 0x0000000000400880 in main (argc=1, argv=0x7fffffffdc38) at delme.c:19 (gdb) info inferior Num Description Executable * 1 process 8272 /tmp/(gdb) n Single stepping until exit from function fork, which has no line number information.

returns a non negative pid to the parent and 0 to the child.

I would like to step through this sequence of calls with GDB, however my break points causes the child not to run or interrupt system calls which cause the parent to terminate.

First you'll need a basic compiler setup -- Min GW and MSYS -- in order to run the configuration scripts.

bison and flex are also required in order to build a GCC toolchain from source.

When a program forks, gdb will continue to debug the parent process and the child process will run unimpeded.

/bin/ls (gdb) shell lsof -p 5262 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME ls 5262 njriley cwd DIR 0,18 14336 262358 /afs/edu/user/njriley ls 5262 njriley rtd DIR 8,5 4096 2 / ls 5262 njriley txt REG 8,5 92312 8255 /bin/ls ls 5262 njriley mem REG 8,5 14744 441594 /lib/1.1.0 ls 5262 njriley mem REG 8,5 9680 450321 /lib/i686/cmov/libdl-2.7ls 5262 njriley mem REG 8,5 116414 450307 /lib/i686/cmov/libpthread-2.7ls 5262 njriley mem REG 8,5 1413540 450331 /lib/i686/cmov/libc-2.7ls 5262 njriley mem REG 8,5 24800 441511 /lib/1.1.0 ls 5262 njriley mem REG 8,5 95964 441580 /lib/1 ls 5262 njriley mem REG 8,5 30624 450337 /lib/i686/cmov/librt-2.7ls 5262 njriley mem REG 8,5 113248 441966 /lib/ld-2.7ls 5262 njriley 0u CHR 136,14 16 /dev/pts/14 ls 5262 njriley 1u CHR 136,14 16 /dev/pts/14 ls 5262 njriley 2u CHR 136,14 16 /dev/pts/14 ls 5262 njriley 3r FIFO 0,6 62083274 pipe ls 5262 njriley 4w FIFO 0,6 62083274 pipe ls 5262 njriley 5r REG 8,5 92312 8255 /bin/ls You can attach a breakpoint command list (sourceware.org/gdb/current/onlinedocs/gdb/Break-Commands.ht‌​ml) to any breakpoint, thus running lsof on a breakpoint.

In case it matters I'm using g 4.4.3, gdb 7.1, running on Ubuntu 10.04 x86_64.

The example shell scripts given here can just be saved to the build directory and run directly from the MSYS shell.

Although they specify an arm-elf target they should be suitable for any cross compiler if you change the target variable to suit your chosen processor.

After gdb hangs and I have to kill it to free the terminal (ctrl-C does not work, I have to do this from a different terminal window by getting the process id for that gdb session and using kill -9).

I'm guessing that gdb is hanging because it's waiting for the application to stop at the next instruction and somehow the application finished execution without gdb identifying this.

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Does anybody have an idea why Core Dump Directory isn't working on Ubuntu?

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