mirror of
https://github.com/drasko/codezero.git
synced 2026-01-12 02:43:15 +01:00
51 lines
1.1 KiB
C
51 lines
1.1 KiB
C
/*
|
|
* l4/posix glue for lseek()
|
|
*
|
|
* Copyright (C) 2007 Bahadir Balban
|
|
*/
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
#include <l4lib/arch/syscalls.h>
|
|
#include <l4lib/arch/syslib.h>
|
|
#include <l4lib/ipcdefs.h>
|
|
#include <libposix.h>
|
|
|
|
static inline off_t l4_lseek(int fildes, off_t offset, int whence)
|
|
{
|
|
off_t offres;
|
|
|
|
write_mr(L4SYS_ARG0, fildes);
|
|
write_mr(L4SYS_ARG1, offset);
|
|
write_mr(L4SYS_ARG2, whence);
|
|
|
|
/* Call pager with shmget() request. Check ipc error. */
|
|
if ((offres = l4_sendrecv(PAGER_TID, PAGER_TID, L4_IPC_TAG_LSEEK)) < 0) {
|
|
print_err("%s: L4 IPC Error: %d.\n", __FUNCTION__, offres);
|
|
return offres;
|
|
}
|
|
/* Check if syscall itself was successful */
|
|
if ((offres = l4_get_retval()) < 0) {
|
|
print_err("%s: OPEN Error: %d.\n", __FUNCTION__, (int)offres);
|
|
return offres;
|
|
|
|
}
|
|
return offres;
|
|
}
|
|
|
|
off_t lseek(int fildes, off_t offset, int whence)
|
|
{
|
|
int ret = l4_lseek(fildes, offset, whence);
|
|
|
|
/* If error, return positive error code */
|
|
if (ret < 0) {
|
|
errno = -ret;
|
|
return -1;
|
|
}
|
|
/* else return value */
|
|
return ret;
|
|
|
|
}
|
|
|