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58b833dd7f
This is the first commit towards implementing vm object based paging with right COW methods.
75 lines
1.6 KiB
C
75 lines
1.6 KiB
C
/*
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* l4/posix glue for open()
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*
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* Copyright (C) 2007 Bahadir Balban
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <sys/shm.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <l4lib/arch/syscalls.h>
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#include <l4lib/arch/syslib.h>
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#include <l4lib/ipcdefs.h>
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#include <fcntl.h>
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#include <l4/macros.h>
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#include INC_GLUE(memory.h)
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/*
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* Arguments that are too large to fit in message registers are
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* copied onto another area that is still on the utcb, and the servers
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* map-in the task utcb and read those arguments from there.
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*/
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void *copy_to_utcb(void *arg, int size)
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{
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BUG_ON(size > PAGE_SIZE);
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memcpy(utcb->buf, arg, size);
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}
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static inline int l4_open(const char *pathname, int flags, mode_t mode)
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{
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int fd;
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// write_mr(L4SYS_ARG0, (unsigned long)pathname);
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copy_to_utcb((void *)pathname, strlen(pathname));
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write_mr(L4SYS_ARG1, flags);
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write_mr(L4SYS_ARG2, (u32)mode);
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/* Call pager with shmget() request. Check ipc error. */
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if ((fd = l4_sendrecv(VFS_TID, VFS_TID, L4_IPC_TAG_OPEN)) < 0) {
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printf("%s: L4 IPC Error: %d.\n", __FUNCTION__, fd);
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return fd;
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}
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/* Check if syscall itself was successful */
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if ((fd = l4_get_retval()) < 0) {
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printf("%s: OPEN Error: %d.\n", __FUNCTION__, fd);
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return fd;
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}
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return fd;
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}
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int open(const char *pathname, int oflag, ...)
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{
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int ret;
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mode_t mode = 0;
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if (oflag & O_CREAT) {
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va_list arg;
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va_start(arg, oflag);
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mode = va_arg(arg, mode_t);
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va_end(arg);
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}
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ret = l4_open(pathname, oflag, mode);
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/* If error, return positive error code */
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if (ret < 0) {
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errno = -ret;
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return -1;
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}
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/* else return value */
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return ret;
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}
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