gdb 调试正在运行的记录

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源程序test.c

#include <sys/types.h>#include <sys/stat.h>#include <string.h>#include <time.h>#include <stdio.h>#include <stdlib.h>#include <errno.h>int main(int argc, char *argv[]){struct stat sb;if (argc != 2) {fprintf(stderr, "Usage: %s <pathname>\n", argv[0]);exit(EXIT_FAILURE);}while (1) {if (stat("/tmp/tmp", &sb) == 0){if (stat(argv[1], &sb) == -1) {int exitCode = 33;perror("stat");printf("%s\n", strerror(errno));exit(EXIT_FAILURE);}}sleep(5);}return 0;}

编译运行:

$ gcc -g test.c -o test && ./test /tmp/iojjooo

目标，通过gdb查看 exitCode的值.

1. 查看./test进程的pid

ps -ef |grep test

得知进程IP 3429

2. 启动gdb 并attach 该进程.

</pre><pre name="code" class="plain">$gdb --pid 3249GNU gdb (Ubuntu/Linaro 7.4-2012.02-0ubuntu2) 7.4-2012.02Copyright (C) 2012 Free Software Foundation, Inc.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-linux-gnu".For bug reporting instructions, please see:<http://bugs.launchpad.net/gdb-linaro/>.Attaching to process 3249Reading symbols from /home/taoxie/test...done.Reading symbols from /lib/x86_64-linux-gnu/libc.so.6...(no debugging symbols found)...done.Loaded symbols for /lib/x86_64-linux-gnu/libc.so.6Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done.Loaded symbols for /lib64/ld-linux-x86-64.so.20x00007f61e94c5020 in nanosleep () from /lib/x86_64-linux-gnu/libc.so.6(gdb) list test.c:21 # 查看flow.c文件第23行周围的10行 16            }17    18            while (1) {19                if (stat("/tmp/tmp", &sb) == 0)20                {21                    if (stat(argv[1], &sb) == -1) {22                            int exitCode = 33;23                            perror("stat");24                            printf("%s\n", strerror(errno));25                            exit(EXIT_FAILURE);(gdb) b 21 Breakpoint 1 at 0x4007b0: file test.c, line 21.(gdb) info b ＃查看断点信卢Num     Type           Disp Enb Address            What1       breakpoint     keep y   0x00000000004007b0 in main at test.c:21(gdb) delete 1 ＃删除断点 ， 1为断点号(gdb) backtrace  ＃查看堆栈信息#0  main (argc=2, argv=0x7fff0fbf3d68) at test.c:23(gdb) cContinuing.

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