michaelh/zephyr
1
0
Fork 0
Code Releases Activity

lib: fdtable: Define standard I/O file descriptors if CONFIG_POSIX_API

Browse source 
This is simplistic implementation which just redirects to (likewise
simplistic) implementation in lib/libc/newlib/libc-hooks.c. This
should be replaced with bindings to "real console", but what should
be a "real console" is so far discussed, at the RFC stage.

This implementation goes into the fdtable.c itself to keep all those
things nicely static. (This is again likely will change when we have
"real console", but again, it's so far not clear where it would
belong, so at least avoid creating random files to be deleted later).

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
This commit is contained in:
Paul Sokolovsky 2018-10-18 22:01:02 +03:00 • committed by Carles Cufí
commit 65a33bd0c0
1 changed files with 55 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

56
lib/fdtable.c
View file

@ -22,7 +22,28 @@ struct fd_entry {
const struct fd_op_vtable *vtable;
};
static struct fd_entry fdtable[CONFIG_POSIX_MAX_FDS];
/* A few magic values for fd_entry::obj used in the code. */
#define FD_OBJ_RESERVED (void *)1
#define FD_OBJ_STDIN (void *)0x10
#define FD_OBJ_STDOUT (void *)0x11
#define FD_OBJ_STDERR (void *)0x12
#ifdef CONFIG_POSIX_API
static struct fd_op_vtable stdinout_fd_op_vtable;
#endif
static struct fd_entry fdtable[CONFIG_POSIX_MAX_FDS] = {
#ifdef CONFIG_POSIX_API
/*
* Predefine entries for stdin/stdout/stderr. Object pointer
* is unused and just should be !0 (random different values
* are used to posisbly help with debugging).
*/
{FD_OBJ_STDIN, &stdinout_fd_op_vtable},
{FD_OBJ_STDOUT, &stdinout_fd_op_vtable},
{FD_OBJ_STDERR, &stdinout_fd_op_vtable},
#endif
};
static K_MUTEX_DEFINE(fdtable_lock);
@ -168,4 +189,37 @@ off_t lseek(int fd, off_t offset, int whence)
offset, whence);
}
/*
* fd operations for stdio/stdout/stderr
*/
int _impl__zephyr_write(const char *buf, int nbytes);
static ssize_t stdinout_read_vmeth(void *obj, void *buffer, size_t count)
{
return 0;
}
static ssize_t stdinout_write_vmeth(void *obj, const void *buffer, size_t count)
{
#ifdef CONFIG_BOARD_NATIVE_POSIX
return write(1, buffer, count);
#else
return _impl__zephyr_write(buffer, count);
#endif
}
static int stdinout_ioctl_vmeth(void *obj, unsigned int request, ...)
{
errno = EINVAL;
return -1;
}
static struct fd_op_vtable stdinout_fd_op_vtable = {
.read = stdinout_read_vmeth,
.write = stdinout_write_vmeth,
.ioctl = stdinout_ioctl_vmeth,
};
#endif /* CONFIG_POSIX_API */