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	niro	532	/*
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