mirror of
https://github.com/drasko/codezero.git
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142 lines
2.9 KiB
C
142 lines
2.9 KiB
C
/*
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* l4/posix glue for read() / sys_readdir()
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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 <string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <l4lib/ipcdefs.h>
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#include <l4lib/os/posix/readdir.h>
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#include <l4/macros.h>
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#include INC_GLUE(memory.h)
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#include INC_GLUE(message.h)
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#include <libposix.h>
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/*
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* TODO:
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*
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* Do this as follows:
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*
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* A short ipc l4_send() to indicate request
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* An extended l4_receive_extended() to get back extended buffer.
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*
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* Or do it just like read()
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*/
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static inline int l4_readdir(int fd, void *buf, size_t count)
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{
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int cnt, err;
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write_mr(L4SYS_ARG0, fd);
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write_mr(L4SYS_ARG1, count);
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/* Call pager with readdir() request. Check ipc error. */
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if ((err = l4_send(pagerid, L4_IPC_TAG_READDIR)) < 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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/* Call pager with readdir() request. Check ipc error. */
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if ((err = l4_receive_extended(pagerid,
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L4_IPC_EXTENDED_MAX_SIZE,
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buf)) < 0) {
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print_err("%s: L4 Extended 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 ((cnt = l4_get_retval()) < 0) {
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print_err("%s: READDIR Error: %d.\n", __FUNCTION__, (int)cnt);
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return cnt;
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}
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return cnt;
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}
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#if 0
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static inline int l4_readdir(int fd, void *buf, size_t count)
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{
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int cnt;
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write_mr(L4SYS_ARG0, fd);
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write_mr(L4SYS_ARG1, (unsigned long)buf);
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write_mr(L4SYS_ARG2, count);
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/* Call pager with readdir() request. Check ipc error. */
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if ((cnt = l4_sendrecv(pagerid, pagerid, L4_IPC_TAG_READDIR)) < 0) {
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print_err("%s: L4 IPC Error: %d.\n", __FUNCTION__, cnt);
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return cnt;
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}
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/* Check if syscall itself was successful */
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if ((cnt = l4_get_retval()) < 0) {
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print_err("%s: READDIR Error: %d.\n", __FUNCTION__, (int)cnt);
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return cnt;
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}
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return cnt;
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}
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#endif
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static inline int l4_read(int fd, void *buf, size_t count)
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{
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int cnt;
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write_mr(L4SYS_ARG0, fd);
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write_mr(L4SYS_ARG1, (unsigned long)buf);
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write_mr(L4SYS_ARG2, count);
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/* Call pager with read() request. Check ipc error. */
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if ((cnt = l4_sendrecv(pagerid, pagerid, L4_IPC_TAG_READ)) < 0) {
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print_err("%s: L4 IPC Error: %d.\n", __FUNCTION__, cnt);
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return cnt;
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}
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/* Check if syscall itself was successful */
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if ((cnt = l4_get_retval()) < 0) {
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print_err("%s: READ Error: %d.\n", __FUNCTION__, (int)cnt);
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return cnt;
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}
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return cnt;
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}
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ssize_t read(int fd, void *buf, size_t count)
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{
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int ret;
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if (!count)
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return 0;
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ret = l4_read(fd, buf, count);
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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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ssize_t os_readdir(int fd, void *buf, size_t count)
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{
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int ret;
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if (!count)
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return 0;
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ret = l4_readdir(fd, buf, count);
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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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