Are you checking the pointer returned by kmalloc() before using it?
Norm
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, July 02, 2002 6:07 AM
Subject: [rtl] problem in allocating memory in kernel
hi,all
In my program, memory (by using kmalloc) is allocated to form a chain
table in kernel(RTLinux v3.1):
code in kernel:
int allocate_mem(unsigned int fifo)
{
......
p0=(struct Head_Struct *)kmalloc(HEAD_LEN_SIZE);
......
}
int init_module(void)
{
.....
rtf_create_handler(PLC_DATA_FIFO, &allocate_mem);
.....
}
code in userspace:
write(fd1,p,HEAD_LEN_SIZE);
it works well if the chain table is short, But if the chain table is longer
,there is an error: segmentation fault.
why?
chen
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