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https://github.com/drasko/codezero.git
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cb561ab262
Added UTCB functions for full ipc that copy buffer or string payloads in secondary message registers. Some posix syscalls now use these utcb functions to copy pathnames.
127 lines
2.6 KiB
C
127 lines
2.6 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 <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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#include <libposix.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_full(PAGER_TID, PAGER_TID, L4_IPC_TAG_FSTAT)) < 0) {
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print_err("%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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print_err("%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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return 0;
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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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utcb_full_strcpy_from(pathname);
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/* Pathname address on utcb page */
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write_mr(L4SYS_ARG0, (unsigned long)utcb_full_buffer());
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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_full(PAGER_TID, PAGER_TID, L4_IPC_TAG_STAT)) < 0) {
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print_err("%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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print_err("%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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