gdb调试多进程和多线程命令
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gdb调试多进程和多线程命令
原文地址:http://blog.csdn.net/pbymw8iwm/article/details/7876797
- 默认设置下,在调试多进程程序时GDB只会调试主进程。但是GDB(>V7.0)支持多进程的
分别以及同时
调试,换句话说,GDB可以同时调试多个程序。只需要设置follow-fork-mode(默认值:parent)和detach-on-fork(默认值:on)即可。
设置方法:set follow-fork-mode [parent|child] set detach-on-fork [on|off]
查询正在调试的进程:info inferiors
切换调试的进程: inferior
添加新的调试进程: add-inferior [-copies n] [-exec executable] ,可以用file executable来分配给inferior可执行文件。
其他:remove-inferiors infno, detach inferior
GDB默认支持调试多线程,跟主线程,子线程block在create thread。
查询线程:info threads
切换调试线程:thread
例程:
#include <stdio.h>#include <pthread.h>void processA();void processB();void * processAworker(void *arg);int main(int argc, const char *argv[]) { int pid; pid = fork(); if(pid != 0) processA(); else processB(); return 0; }void processA() { pid_t pid = getpid(); char prefix[] = "ProcessA: "; char tprefix[] = "thread "; int tstatus; pthread_t pt; printf("%s%lu %s\n", prefix, pid, "step1"); tstatus = pthread_create(&pt, NULL, processAworker, NULL); if( tstatus != 0 ) { printf("ProcessA: Can not create new thread."); } processAworker(NULL); sleep(1); }void * processAworker(void *arg) { pid_t pid = getpid(); pthread_t tid = pthread_self(); char prefix[] = "ProcessA: "; char tprefix[] = "thread "; printf("%s%lu %s%lu %s\n", prefix, pid, tprefix, tid, "step2"); printf("%s%lu %s%lu %s\n", prefix, pid, tprefix, tid, "step3"); return NULL; }void processB() { pid_t pid = getpid(); char prefix[] = "ProcessB: "; printf("%s%lu %s\n", prefix, pid, "step1"); printf("%s%lu %s\n", prefix, pid, "step2"); printf("%s%lu %s\n", prefix, pid, "step3"); }
输出:
[cnwuwil@centos c-lab]$ ./test
ProcessA: 802 step1
ProcessB: 803 step1
ProcessB: 803 step2
ProcessB: 803 step3
ProcessA: 802 thread 3077555904 step2
ProcessA: 802 thread 3077555904 step3
ProcessA: 802 thread 3077553008 step2
ProcessA: 802 thread 3077553008 step3
调试:
调试主进程,block子进程。
(gdb) set detach-on-fork off
(gdb) show detach-on-fork
Whether gdb will detach the child of a fork is off.
(gdb) catch fork
Catchpoint 1 (fork)
(gdb) r
[Thread debugging using libthread_db enabled]
Catchpoint 1 (forked process 3475), 0x00110424 in __kernel_vsyscall ()
Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.47.el6.i686
(gdb) break test.c:14
Breakpoint 2 at 0x8048546: file test.c, line 14.
(gdb) cont
[New process 3475]
[Thread debugging using libthread_db enabled]
Breakpoint 2, main (argc=1, argv=0xbffff364) at test.c:14
Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.47.el6.i686
(gdb) info inferiors
Num Description Executable
2 process 3475 /home/cnwuwil/labs/c-lab/test
* 1 process 3472 /home/cnwuwil/labs/c-lab/test切换到子进程:
设断点继续调试主进程,主进程产生两个子线程:
(gdb) break test.c:50
Breakpoint 3 at 0x804867d: file test.c, line 50. (2 locations)
(gdb) cont
ProcessA: 3472 step1
[New Thread 0xb7fe7b70 (LWP 3562)]
ProcessA: 3472 thread 3086911168 step2
Breakpoint 3, processAworker (arg=0x0) at test.c:50
(gdb) info inferiors
Num Description Executable
2 process 3475 /home/cnwuwil/labs/c-lab/test
* 1 process 3472 /home/cnwuwil/labs/c-lab/test
(gdb) info threads
3 Thread 0xb7fe7b70 (LWP 3562) 0x00110424 in __kernel_vsyscall ()
2 Thread 0xb7fe86c0 (LWP 3475) 0x00110424 in ?? ()
* 1 Thread 0xb7fe86c0 (LWP 3472) processAworker (arg=0x0) at test.c:50切换到主进程中的子线程,注意:线程2为前面产生的子进程
(gdb) thread 3
[Switching to thread 3 (Thread 0xb7fe7b70 (LWP 3562))]#0 0x00110424 in __kernel_vsyscall ()
(gdb) cont
ProcessA: 3472 thread 3086911168 step3
ProcessA: 3472 thread 3086908272 step2
[Switching to Thread 0xb7fe7b70 (LWP 3562)]
Breakpoint 3, processAworker (arg=0x0) at test.c:50
(gdb) info threads
* 3 Thread 0xb7fe7b70 (LWP 3562) processAworker (arg=0x0) at test.c:50
2 Thread 0xb7fe86c0 (LWP 3475) 0x00110424 in ?? ()
1 Thread 0xb7fe86c0 (LWP 3472) 0x00110424 in __kernel_vsyscall ()
(gdb) thread 1
- gdb调试多进程和多线程命令
- GDB调试多进程和多线程命令
- gdb调试多进程和多线程命令
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- gdb调试多进程和多线程命令
- gdb调试多进程和多线程命令
- gdb调试多进程和多线程命令
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