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https://github.com/drasko/codezero.git
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54a9b2901d
- Now libl4 has no references to utcb page or shmat etc. - Pager does not deal with special case utcb page allocation. It instead allocates a shared page from shm memory pool. - All tasks working to original standard. Next: - Add per-thread utcb allocation from the kernel - Add larger register file for standard ipc - Add long ipc (up to 1Kb)
124 lines
2.5 KiB
C
124 lines
2.5 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 <string.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/os/posix/kstat.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 <l4lib/utcb.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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#include <shpage.h>
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static inline int l4_fstat(int fd, void *buffer)
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{
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int err;
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/* Pathname address on utcb page */
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write_mr(L4SYS_ARG0, fd);
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write_mr(L4SYS_ARG1, (unsigned long)buffer);
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/* Call pager with open() request. Check ipc error. */
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if ((err = l4_sendrecv(VFS_TID, VFS_TID, L4_IPC_TAG_FSTAT)) < 0) {
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printf("%s: L4 IPC Error: %d.\n", __FUNCTION__, err);
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return err;
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}
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/* Check if syscall itself was successful */
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if ((err = l4_get_retval()) < 0) {
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printf("%s: FSTAT Error: %d.\n", __FUNCTION__, err);
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return err;
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}
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return err;
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}
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int kstat_to_stat(struct kstat *ks, struct stat *s)
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{
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s->st_dev = 0;
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s->st_ino = ks->vnum;
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s->st_mode = ks->mode;
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s->st_nlink = ks->links;
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s->st_uid = ks->uid;
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s->st_gid = ks->gid;
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s->st_rdev = 0;
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s->st_size = ks->size;
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s->st_blksize = ks->blksize;
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s->st_blocks = ks->size / ks->blksize;
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s->st_atime = ks->atime;
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s->st_mtime = ks->mtime;
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s->st_ctime = ks->ctime;
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}
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static inline int l4_stat(const char *pathname, void *buffer)
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{
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int err;
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struct kstat ks;
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copy_to_shpage((void *)pathname, 0, strlen(pathname) + 1);
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/* Pathname address on utcb page */
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write_mr(L4SYS_ARG0, (unsigned long)shared_page);
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/* Pass on buffer that should receive stat */
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write_mr(L4SYS_ARG1, (unsigned long)&ks);
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/* Call vfs with stat() request. Check ipc error. */
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if ((err = l4_sendrecv(VFS_TID, VFS_TID, L4_IPC_TAG_STAT)) < 0) {
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printf("%s: L4 IPC Error: %d.\n", __FUNCTION__, err);
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return err;
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}
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/* Check if syscall itself was successful */
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if ((err = l4_get_retval()) < 0) {
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printf("%s: STAT Error: %d.\n", __FUNCTION__, err);
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return err;
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}
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/* Convert c0-style stat structure to posix stat */
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kstat_to_stat(&ks, buffer);
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return err;
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}
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int fstat(int fd, struct stat *buffer)
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{
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int ret;
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ret = l4_fstat(fd, buffer);
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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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int stat(const char *pathname, struct stat *buffer)
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{
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int ret;
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ret = l4_stat(pathname, buffer);
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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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