每行打印一個結構體成員
例子
#include <stdio.h>
#include <pthread.h>
typedef struct
{
int a;
int b;
int c;
int d;
pthread_mutex_t mutex;
}ex_st;
int main(void) {
ex_st st = {1, 2, 3, 4, PTHREAD_MUTEX_INITIALIZER};
printf("%d,%d,%d,%d\n", st.a, st.b, st.c, st.d);
return 0;
}
技巧
默認情況下,gdb以一種“緊湊”的方式打印結構體。以上面代碼為例:
(gdb) n
15 printf("%d,%d,%d,%d\n", st.a, st.b, st.c, st.d);
(gdb) p st
$1 = {a = 1, b = 2, c = 3, d = 4, mutex = {__data = {__lock = 0, __count = 0, __owner = 0, __nusers = 0, __kind = 0,
__spins = 0, __list = {__prev = 0x0, __next = 0x0}}, __size = '\000' <repeats 39 times>, __align = 0}}
可以看到結構體的顯示很混亂,尤其是結構體裡還嵌套著其它結構體時。
可以執行“set print pretty on”命令,這樣每行只會顯示結構體的一名成員,而且還會根據成員的定義層次進行縮進:
(gdb) set print pretty on
(gdb) p st
$2 = {
a = 1,
b = 2,
c = 3,
d = 4,
mutex = {
__data = {
__lock = 0,
__count = 0,
__owner = 0,
__nusers = 0,
__kind = 0,
__spins = 0,
__list = {
__prev = 0x0,
__next = 0x0
}
},
__size = '\000' <repeats 39 times>,
__align = 0
}
}
詳情參見gdb手冊
貢獻者
nanxiao