mirror of
https://github.com/drasko/codezero.git
synced 2026-01-12 02:43:15 +01:00
45 lines
963 B
C
45 lines
963 B
C
/*
|
|
* l4/posix glue for write()
|
|
*
|
|
* 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>
|
|
|
|
static inline int l4_write(int fd, const void *buf, size_t count)
|
|
{
|
|
size_t wrcnt;
|
|
|
|
write_mr(L4SYS_ARG0, fd);
|
|
write_mr(L4SYS_ARG1, (const unsigned long)buf);
|
|
write_mr(L4SYS_ARG2, count);
|
|
|
|
/* Call pager with shmget() request. Check ipc error. */
|
|
if ((errno = l4_sendrecv(VFS_TID, VFS_TID, L4_IPC_TAG_WRITE)) < 0) {
|
|
printf("%s: L4 IPC Error: %d.\n", __FUNCTION__, errno);
|
|
return -1;
|
|
}
|
|
/* Check if syscall itself was successful */
|
|
if ((wrcnt = l4_get_retval()) < 0) {
|
|
printf("%s: WRITE Error: %d.\n", __FUNCTION__, (int)wrcnt);
|
|
errno = (int)wrcnt;
|
|
return -1;
|
|
|
|
}
|
|
return wrcnt;
|
|
}
|
|
|
|
ssize_t write(int fd, const void *buf, size_t count)
|
|
{
|
|
if (!count)
|
|
return 0;
|
|
|
|
return l4_write(fd, buf, count);
|
|
}
|
|
|