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ctime() 导致 SIGABRT(?!)

转载 作者:太空宇宙 更新时间:2023-11-04 01:12:25 26 4
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这是代码:

void i_log_ (int error, const char * file, int line, const char * fmt, ...)
{
/* Get error description */
char * str_err = get_str_error (errno);
remove_trailing_newl (str_err);

/* Format string and parameters */
char message [1024];
va_list ap;
va_start (ap, fmt);
vsprintf (message, fmt, ap);
va_end (ap);

/* Get time */
time_t t = time (NULL);
char stime [64];
char * temp = ctime (&t);
strncpy (stime, temp, sizeof stime - 1);
remove_trailing_newl (stime);

FILE * log;


#ifdef __WIN32__
#else
# ifdef P_LISTENER
log = fopen (I_LOG_FILE, "a+b");
flock (fileno (log), LOCK_EX);
# else /* shared file descriptor of log, lock before opening */
pthread_mutex_lock (& mutex);
log = fopen (I_LOG_FILE, "a+b");
# endif
#endif

if (log) {
if (error)
fprintf (log, ERR_FORMAT, stime, file, line, str_err, message);
else
fprintf (log, ERR_FORMAT_NO_ERRNO, stime, file, line, message);
}

#ifdef __WIN32__
free (str_err);
#else
# ifdef P_LISTENER
flock (fileno (log), LOCK_UN);
fclose (log);
# else
fclose (log);
pthread_mutex_unlock (& mutex);
# endif
#endif
return;
}

虽然有锁机制,但在这种情况下函数并没有被并发调用,所以我认为这不是问题所在。但是,该程序收到一个 SIGABRT:

[...]
(gdb) c
Continuing.

Program received signal SIGHUP, Hangup. // It's OK, I sent this.
0x00dee416 in __kernel_vsyscall ()
(gdb) c
Continuing.

Program received signal SIGABRT, Aborted.
0x00dee416 in __kernel_vsyscall ()
(gdb) up
#1 0x0013ae71 in raise () from /lib/i386-linux-gnu/libc.so.6
(gdb) up
#2 0x0013e34e in abort () from /lib/i386-linux-gnu/libc.so.6
(gdb) up
#3 0x00171577 in ?? () from /lib/i386-linux-gnu/libc.so.6
(gdb) up
#4 0x0017b961 in ?? () from /lib/i386-linux-gnu/libc.so.6
(gdb) up
#5 0x0017d28b in ?? () from /lib/i386-linux-gnu/libc.so.6
(gdb) up
#6 0x0018041d in free () from /lib/i386-linux-gnu/libc.so.6
(gdb) up
#7 0x0019b0d2 in ?? () from /lib/i386-linux-gnu/libc.so.6
(gdb) up
#8 0x0019b3c5 in ?? () from /lib/i386-linux-gnu/libc.so.6
(gdb) up
#9 0x00199a9f in localtime () from /lib/i386-linux-gnu/libc.so.6
(gdb) up
#10 0x00199951 in ctime () from /lib/i386-linux-gnu/libc.so.6
(gdb) up
#11 0x08049634 in i_log_ (error=0, file=0x804b17d "src/group.c", line=53, fmt=0x804b128 "Setting up new configuration: listener type: %s, number: %d, http-log: %s, port: %d.") at src/error.c:42
42 char * temp = ctime (&t);
(gdb) print temp
$1 = 0x260000 ""
(gdb) print t
$2 = 1329935482
(gdb) print &t
$3 = (time_t *) 0xbff8a5b8
(gdb)

我没有任何线索。 ctime 返回一个空字符串,手册页没有提到这种情况。现在想想,我不明白为什么它会返回一个空字符串,以及该代码有什么问题。

感谢任何帮助。

最佳答案

ctime 未返回空字符串。它根本还没有返回,因为它在尝试做它的事情时崩溃了。

崩溃发生在 free() 内部,因此您可能在调用 ctime() 之前的某个时刻损坏了内存。如果您在受支持的平台上运行,请尝试使用 Valgrind 等工具来检查您的内存访问。

关于ctime() 导致 SIGABRT(?!),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9401179/

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