每行打印一个结构体成员
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
默认情况下,gdb以一种“紧凑”的方式打印结构体。以上面代码为例:
(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}}
可以看到结构体的显示很混乱,尤其是结构体里还嵌套着其它结构体时。
可以执行“set print pretty on”命令,这样每行只会显示结构体的一名成员,而且还会根据成员的定义层次进行缩进:
(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
}
}
详情参见gdb手册
贡献者
nanxiao