我没有使用动态内存分配，没有在任何地方释放内存。它甚至给出了两个自由误差。有谁能帮帮我吗?
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/inotify.h>
#include <limits.h>
#define MAX_EVENTS 1024 /*Max. number of events to process at one go*/
#define LEN_NAME 16 /*Assuming that the length of the filename won't exceed 16 bytes*/
#define EVENT_SIZE ( sizeof (struct inotify_event) ) /*size of one event*/
#define BUF_LEN ( MAX_EVENTS * ( EVENT_SIZE + LEN_NAME )) /*buffer to store the data of events*/
#define SIZE 20000
int main( int argc, char **argv )
{
int length, i = 0, wd;
int fd;
char buffer[BUF_LEN];
time_t timer;
char buffer2[25];
char *s=NULL;
struct tm* tm_info;
FILE *fk;
//char buffer[EVENT_BUF_LEN];
char str1[] = "File has been updated at time :";
time(&timer);
tm_info = localtime(&timer);
strftime(buffer2, 25, "%Y:%m:%d %H:%M:%S", tm_info);
fk = fopen( "/home/technoworld/Desktop/file.txt" , "w" );
/* Initialize Inotify*/
fd = inotify_init();
if ( fd < 0 ) {
perror( "Couldn't initialize inotify");
}
/* add watch to starting directory */
wd = inotify_add_watch(fd, argv[1], IN_MODIFY );
if (wd == -1)
{
printf("Couldn't add listen to %sn",argv[1]);
}
else
{
printf("Listening: %sn",argv[1]);
}
/* do it forever*/
while(1)
{
i = 0;
length = read( fd, buffer, BUF_LEN );
if ( length < 0 ) {
perror( "read" );
}
while ( i < length ) {
struct inotify_event *event = ( struct inotify_event * ) &buffer[ i ];
if ( event->len ) {
if ( event->mask & IN_MODIFY) {
if (event->mask & IN_ISDIR)
printf( "The directory %s was modified.n", event->name );
else
{
printf( "The file %s was modified at %s n", event->name, buffer2 );
fprintf(fk,"%s %s %c",str1, buffer2, 'n');
}
}
i += EVENT_SIZE + event->len;
}
}
fcloseall(fk);
}
/* Clean up*/
inotify_rm_watch( fd, wd );
close( fd );
return 0;
}
我正在尝试收听文件中的更改，并将更改写入带有时间戳的日志文件。
错误:Listening: /home/technoworld/Desktop/tmp/
The file .goutputstream-L3JTXW was modified at 2013:05:24 22:06:21
The file .goutputstream-IRR4XW was modified at 2013:05:24 22:06:21
*** glibc detected *** ./a: double free or corruption (fasttop): 0x09438008 ***
======= Backtrace: =========
/lib/i386-linux-gnu/libc.so.6(+0x75ee2)[0xb7624ee2]
./a[0x80488bb]
/lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xf3)[0xb75c84d3]
./a[0x80485c1]
======= Memory map: ========
08048000-08049000 r-xp 00000000 07:00 558766 /home/technoworld/Desktop/a
08049000-0804a000 r--p 00000000 07:00 558766 /home/technoworld/Desktop/a
0804a000-0804b000 rw-p 00001000 07:00 558766 /home/technoworld/Desktop/a
09438000-09459000 rw-p 00000000 00:00 0 [heap]
b7578000-b7594000 r-xp 00000000 07:00 394123 /lib/i386-linux-gnu/libgcc_s.so.1
b7594000-b7595000 r--p 0001b000 07:00 394123 /lib/i386-linux-gnu/libgcc_s.so.1
b7595000-b7596000 rw-p 0001c000 07:00 394123 /lib/i386-linux-gnu/libgcc_s.so.1
b75ae000-b75af000 rw-p 00000000 00:00 0
b75af000-b7752000 r-xp 00000000 07:00 394098 /lib/i386-linux-gnu/libc-2.15.so
b7752000-b7753000 ---p 001a3000 07:00 394098 /lib/i386-linux-gnu/libc-2.15.so
b7753000-b7755000 r--p 001a3000 07:00 394098 /lib/i386-linux-gnu/libc-2.15.so
b7755000-b7756000 rw-p 001a5000 07:00 394098 /lib/i386-linux-gnu/libc-2.15.so
b7756000-b7759000 rw-p 00000000 00:00 0
b776e000-b7773000 rw-p 00000000 00:00 0
b7773000-b7774000 r-xp 00000000 00:00 0 [vdso]
b7774000-b7794000 r-xp 00000000 07:00 394076 /lib/i386-linux-gnu/ld-2.15.so
b7794000-b7795000 r--p 0001f000 07:00 394076 /lib/i386-linux-gnu/ld-2.15.so
b7795000-b7796000 rw-p 00020000 07:00 394076 /lib/i386-linux-gnu/ld-2.15.so
bfe5d000-bfe7e000 rw-p 00000000 00:00 0 [stack]
Aborted (core dumped)
fcloseall不接受任何参数。(这是怎么编译的?)
即使初始的fopen是成功的(因此fk不是NULL)，在通过while (1)循环的第一次行程之后，您将调用fcloseall并因此关闭文件。因此，fprintf到fk被打印到一个关闭的文件。由于文件操作分配和使用内存，而关闭操作释放内存，因此您使用的是释放的内存，因此出现glibc错误。
问题就在那里，因为你在64位系统上工作，你不包括time.h和localtime(&timer)的返回类型被解释为32位整数而不是64位指针(未声明的类型默认为int)…您正在丢失隐式声明中的信息。
石蕊试验看看我是否正确:
在include下面声明以下内容:
#include <limits.h>
struct tm;
struct timep;
struct tm *localtime(const time_t *timep);
SIGSEG将消失(尽管您的代码仍然有bug)
正确的做法是#include <time.h>
我在while(1)完成后加入了fclose(fk)。它不会给出任何错误，并且在终端上运行良好。但是在这个例子中，它没有写入file.txt。
代码:#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/inotify.h>
#include <limits.h>
#include <time.h>
#define MAX_EVENTS 1024 /*Max. number of events to process at one go*/
#define LEN_NAME 16 /*Assuming that the length of the filename won't exceed 16 bytes*/
#define EVENT_SIZE ( sizeof (struct inotify_event) ) /*size of one event*/
#define BUF_LEN ( MAX_EVENTS * ( EVENT_SIZE + LEN_NAME )) /*buffer to store the data of events*/
#define SIZE 20000
int main( int argc, char **argv )
{
int length, i = 0, wd;
int fd;
char buffer[BUF_LEN];
time_t timer;
char buffer2[25];
char *s=NULL;
struct tm* tm_info;
FILE *fk;
//char buffer[EVENT_BUF_LEN];
char str1[] = "File has been updated at time :";
time(&timer);
tm_info = localtime(&timer);
strftime(buffer2, 25, "%Y:%m:%d %H:%M:%S", tm_info);
fk = fopen( "/home/technoworld/Desktop/file.txt" , "w" );
/* Initialize Inotify*/
fd = inotify_init();
if ( fd < 0 ) {
perror( "Couldn't initialize inotify");
}
/* add watch to starting directory */
wd = inotify_add_watch(fd, argv[1], IN_MODIFY );
if (wd == -1)
{
printf("Couldn't add listen to %sn",argv[1]);
}
else
{
printf("Listening: %sn",argv[1]);
}
/* do it forever*/
while(1)
{
i = 0;
length = read( fd, buffer, BUF_LEN );
if ( length < 0 ) {
perror( "read" );
}
while ( i < length ) {
struct inotify_event *event = ( struct inotify_event * ) &buffer[ i ];
if ( event->len ) {
if ( event->mask & IN_MODIFY) {
if (event->mask & IN_ISDIR)
printf( "The directory %s was modified.n", event->name );
else
{
printf( "The file %s was modified at %s n", event->name, buffer2 );
fprintf(fk,"%s %s %c",str1, buffer2, 'n');
}
}
i += EVENT_SIZE + event->len;
}
}
}
fclose(fk);
/* Clean up*/
inotify_rm_watch( fd, wd );
close( fd );
return 0;
}