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https://github.com/drasko/codezero.git
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193430d226
Added system call prototypes and posix glue for reading a directory. TODO: FS0 should implement the L4_IPC_TAG_READDIR ipc call.
96 lines
1.9 KiB
C
96 lines
1.9 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 <sys/types.h>
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#include <unistd.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/os/posix/readdir.h>
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static inline int l4_readdir(int fd, void *buf, size_t count)
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{
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size_t 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 shmget() request. Check ipc error. */
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if ((cnt = l4_sendrecv(VFS_TID, VFS_TID, L4_IPC_TAG_READDIR)) < 0) {
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printf("%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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printf("%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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static inline int l4_read(int fd, void *buf, size_t count)
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{
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size_t 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 shmget() request. Check ipc error. */
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if ((cnt = l4_sendrecv(VFS_TID, VFS_TID, L4_IPC_TAG_READ)) < 0) {
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printf("%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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printf("%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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