比如在运行时,我想找出函数"printf"的定义位置.我该怎么做?
我的节目:
#include <stdio.h>
#include <unistd.h>
void main()
{
printf("address of printf is 0x%X\n", printf);
printf("pid is %d\n", getpid());
while (1);
}
输出:
-bash-4.1$ ./a &
[1] 28837
-bash-4.1$ address of printf is 0x4003F8
pid is 28837
然而,这说明这个函数是在我自己的程序中定义的!
-bash-4.1$ head /proc/28837/maps
00400000-00401000 r-xp 00000000 08:06 6946857 /data2/temp/del/a <<<<<<< Address 0x4003F8 is in my own program?
00600000-00601000 rw-p 00000000 08:06 6946857 /data2/temp/del/a
397ec00000-397ec20000 r-xp 00000000 08:11 55837039 /lib64/ld-2.12.so
397ee1f000-397ee20000 r--p 0001f000 08:11 55837039 /lib64/ld-2.12.so
397ee20000-397ee21000 rw-p 00020000 08:11 55837039 /lib64/ld-2.12.so
397ee21000-397ee22000 rw-p 00000000 00:00 0
397f000000-397f18a000 r-xp 00000000 08:11 55837204 /lib64/libc-2.12.so
397f18a000-397f38a000 ---p 0018a000 08:11 55837204 /lib64/libc-2.12.so
397f38a000-397f38e000 r--p 0018a000 08:11 55837204 /lib64/libc-2.12.so
397f38e000-397f38f000 rw-p 0018e000 08:11 55837204 /lib64/libc-2.12.so
这不应该是对libc的呼吁吗?我如何找到这个"printf"或任何其他函数的来源?