Hello all
I am facing a strange problem.... Memory leak during file write to a USB
memory stick.
We are using uClinux2.6.17 on coldfire 5372. The memory card is mounted
on /hom/usb directory. I am trying to run the following simple code
which involves copying a file to different files on the USB storage
device.
Code :
#define BUFSZ 300000
int FileCopy(const char *src, const char *dst )
{
char *buf2;
FILE *fi;
FILE *fo;
unsigned int amount;
unsigned int written;
int result;
buf2 = (char *)malloc(BUFSZ);////new char[BUFSZ]; #if 1
fi = open( src, O_RDONLY );
fo = open( dst, O_CREAT | O_WRONLY, S_IWRITE );
result = 1;
if((fi == -1) || (fo == -1) )
{
result = -1;
if (fi != -1) close(fi);
if (fo != -1) close(fo);
}
amount = read( fi, buf2, BUFSZ);
printf("amount:%d\n", amount);
written = write(fo, buf2, amount);
printf("amount:%d\n", written);
close(fi);
close(fo);
system("free");
return(result);
}
int main()
{
char src[255] = "file2.m4v";
char dst[255];
int i = 0;
long delay;
while(1)
{
sprintf(dst, "/home/usb/Flv%d", i++);
if (FileCopy( src, dst ) != 1)
{
printf("Failed to copy file\n");
}
else
{
printf("Copied file%d\n", i);
}
delay = 0x100000;
while(delay--);
}
return 0;
}
The problem is whenever I run this code I observe following output:
total used free shared buffers
Mem: 62276 9912 52364 0 1536
Copied file9
amount:271005
amount:271005
total used free shared buffers
Mem: 62276 10212 52064 0 1536
Copied file10
amount:271005
amount:271005
total used free shared buffers
Mem: 62276 10500 51776 0 1536
Copied file11
amount:271005
amount:271005
cat /proc/meminfo
MemTotal: 62276 kB
MemFree: 51800 kB
Buffers: 1536 kB
Cached: 3764 kB
SwapCached: 0 kB
Active: 1680 kB
Inactive: 3592 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 62276 kB
LowFree: 51800 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 2948 kB
Writeback: 0 kB
Mapped: 0 kB
Slab: 0 kB
CommitLimit: 31136 kB
Committed_AS: 0 kB
PageTables: 0 kB
VmallocTotal: 0 kB
VmallocUsed: 0 kB
VmallocChunk: 0 kB
total used free shared buffers
Mem: 62276 10800 51476 0 1536
Copied file12
amount:271005
amount:271005
total used free shared buffers
Mem: 62276 11088 51188 0 1536
Copied file13
amount:271005
amount:271005
It can be observed that Used memory increases by about 300KB each time I
do a malloc and fwrite and finally the kernel crashes when the used
memory reaches around 30MB. I am not sure about what is the problem. I
googled around it but I couldn't find much. Could anyone help me in this
regard?
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