解释 gdb 输出
我的程序中出现段错误，并尝试通过 gdb 检测源。
gdb 的 O/p 如下：
[Switching to Thread 0xb6dffb70 (LWP 6448)]
#0 0x00adc026 in __strlen_sse2_bsf () from /lib/libc.so/6
#1 0x08049e77 in sim_txn (fd=0x804c5c0) at rand_trace0.c:390
在 rand_trace0.c:390 处，我有一行“
system_call_length = strlen("rename(")+strlen(filename1)+strlen(",")+strlen(filename)+strlen(")")+1;
一切似乎都在它之前工作”。 我不知所措。
I get a segfault in my program and was trying to detect the source via gdb.
O/p of the gdb is as follows:
[Switching to Thread 0xb6dffb70 (LWP 6448)]
#0 0x00adc026 in __strlen_sse2_bsf () from /lib/libc.so/6
#1 0x08049e77 in sim_txn (fd=0x804c5c0) at rand_trace0.c:390
and at rand_trace0.c:390 I have the line
system_call_length = strlen("rename(")+strlen(filename1)+strlen(",")+strlen(filename)+strlen(")")+1;
Everything seems to be working before it.
I am at a loss.
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filename1和filename都是指向空终止字符串的有效指针吗？出现段错误的最常见原因是指针未正确初始化，或者其中一个字符串不是以 null 结尾（可能是由于缓冲区溢出），从而导致 strlen( ) 尝试读取已分配内存的大小。Are
filename1andfilenameboth valid pointers to null-terminated strings? The most common reason you might get a segfault with that is if your pointer wasn't properly initialized or if one of the strings isn't null-terminated (possibly because of a buffer overflow) and thus is resulting instrlen()trying to read past the size of the allocated memory.