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                # 為vfork調用設置catchpoint ## 例子 #include <stdio.h> #include <stdlib.h> #include <sys/types.h> #include <unistd.h> int main(void) { pid_t pid; pid = vfork(); if (pid < 0) { exit(1); } else if (pid > 0) { exit(0); } printf("hello world\n"); return 0; } ## 技巧 使用gdb調試程序時,可以用“`catch vfork`”命令為`vfork`調用設置`catchpoint`,以上面程序為例: (gdb) catch vfork Catchpoint 1 (vfork) (gdb) r Starting program: /home/nan/a Catchpoint 1 (vforked process 27312), 0x00000034e42acfc4 in vfork () from /lib64/libc.so.6 (gdb) bt #0 0x00000034e42acfc4 in vfork () from /lib64/libc.so.6 #1 0x0000000000400561 in main () at a.c:9 可以看到當`vfork`調用發生后,gdb會暫停程序的運行。 注意:目前只有HP-UX和GNU/Linux支持這個功能。 參見[gdb手冊](https://sourceware.org/gdb/onlinedocs/gdb/Set-Catchpoints.html). ## 貢獻者 nanxiao
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