usr/klibc/llseek.c

/*
 * llseek.c
 *
 * On 32-bit platforms, we need to use the _llseek() system call
 * rather than lseek(), to be able to handle large disks.  _llseek()
 * isn't just a normal syscall which takes a 64-bit argument; it needs
 * to return a 64-bit value and so takes an extra pointer.
 */

#include <unistd.h>
#include <sys/syscall.h>
#include <bitsize.h>

#if _BITSIZE == 32

extern int __llseek(int fd, unsigned long hi, unsigned long lo, off_t * res,
		    int whence);

off_t lseek(int fd, off_t offset, int whence)
{
	off_t result;
	int rv;

	rv = __llseek(fd, (unsigned long)(offset >> 32), (unsigned long)offset,
		      &result, whence);

	return rv ? (off_t) - 1 : result;
}

#endif
1	/*
2	* llseek.c
3	*
4	* On 32-bit platforms, we need to use the _llseek() system call
5	* rather than lseek(), to be able to handle large disks. _llseek()
6	* isn't just a normal syscall which takes a 64-bit argument; it needs
7	* to return a 64-bit value and so takes an extra pointer.
8	*/
9
10	#include <unistd.h>
11	#include <sys/syscall.h>
12	#include <bitsize.h>
13
14	#if _BITSIZE == 32
15
16	extern int __llseek(int fd, unsigned long hi, unsigned long lo, off_t * res,
17	int whence);
18
19	off_t lseek(int fd, off_t offset, int whence)
20	{
21	off_t result;
22	int rv;
23
24	rv = __llseek(fd, (unsigned long)(offset >> 32), (unsigned long)offset,
25	&result, whence);
26
27	return rv ? (off_t) - 1 : result;
28	}
29
30	#endif