Messages in this thread | | | From | "Srinivas Surabhi" <> | Subject | parameters passing problem in driver module | Date | Tue, 20 Feb 2001 16:07:55 +0530 |
| |
In application program ,code for call to write system call is given below... #include<fcntl.h> main() { int count,fd; fd=open("/dev/pseudo",O_RDWR); write(fd,buff,5); } In driver module code for getting the buffer and count
#include<all related header files...> int psuedo_write(struct inode*in,struct file*fp,char *buf,int count) { kprintf("<1>pseudo_write routine called \n"); kprintf("<1>count=%d \n",count); kprintf("<1>buffer=%s \n",buff); return 0; } /******so here after inserting the module into the kernel using insmod pseudo.o and executing the application cc -c pseudo_app.c, the o/p on console is *****/
"pseudo_write routine called" "count=9988345352" /*garbage*/ "buffer=@#%h" . /*garbage*/ /*** but neither the buffer is carried from user space to kernel space nor the count, why?***/Please help me out.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |