bc4374b5fe
The POSIX_MAX_FDS option does not correspond to any standard POSIX option. It was used to define the size of the file descriptor table, which is by no means exclusively used by POSIX (also net, fs, ...). POSIX_MAX_FDS is being deprecated in order to ensure that Zephyr's POSIX Kconfig variables correspond to those defined in the specification, as of IEEE 1003.1-2017. Namely, POSIX_OPEN_MAX. CONFIG_POSIX_MAX_OPEN_FILES is being deprecated for the same reason. To mitigate any possible layering violations, that option is not user selectable. It tracks the newly added CONFIG_ZVFS_OPEN_MAX option, which is native to Zephyr. With this deprecation, we introduce the following Kconfig options that map directly to standard POSIX Option Groups by simply removing "CONFIG_": * CONFIG_POSIX_DEVICE_IO Similarly, with this deprecation, we introduce the following Kconfig options that map directly to standard POSIX Options by simply removing "CONFIG": * CONFIG_POSIX_OPEN_MAX In order to maintain parity with the current feature set, we introduce the following Kconfig options. * CONFIG_POSIX_DEVICE_IO_ALIAS_CLOSE * CONFIG_POSIX_DEVICE_IO_ALIAS_OPEN * CONFIG_POSIX_DEVICE_IO_ALIAS_READ * CONFIG_POSIX_DEVICE_IO_ALIAS_WRITE Gate open(), close(), read(), and write() via the CONFIG_POSIX_DEVICE_IO Kconfig option and move implementations into device_io.c, to be conformant with the spec. Lastly, stage function names for upcoming ZVFS work, to be completed as part of the LTSv3 Roadmap (e.g. zvfs_open(), ..). Signed-off-by: Chris Friedt <cfriedt@tenstorrent.com>
64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
/*
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* Copyright (c) 2024, Tenstorrent AI ULC
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <stddef.h>
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#include <stdint.h>
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#include <zephyr/posix/poll.h>
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#include <zephyr/posix/unistd.h>
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#include <zephyr/posix/sys/select.h>
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#include <zephyr/posix/sys/socket.h>
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/* prototypes for external, not-yet-public, functions in fdtable.c or fs.c */
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int zvfs_close(int fd);
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int zvfs_open(const char *name, int flags);
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ssize_t zvfs_read(int fd, void *buf, size_t sz);
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ssize_t zvfs_write(int fd, const void *buf, size_t sz);
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int close(int fd)
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{
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return zvfs_close(fd);
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}
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#ifdef CONFIG_POSIX_DEVICE_IO_ALIAS_CLOSE
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FUNC_ALIAS(close, _close, int);
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#endif
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int open(const char *name, int flags, ...)
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{
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/* FIXME: necessarily need to check for O_CREAT and unpack ... if set */
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return zvfs_open(name, flags);
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}
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#ifdef CONFIG_POSIX_DEVICE_IO_ALIAS_OPEN
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FUNC_ALIAS(open, _open, int);
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#endif
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int poll(struct pollfd *fds, int nfds, int timeout)
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{
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/* TODO: create zvfs_poll() and dispatch to subsystems based on file type */
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return zsock_poll(fds, nfds, timeout);
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}
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ssize_t read(int fd, void *buf, size_t sz)
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{
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return zvfs_read(fd, buf, sz);
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}
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#ifdef CONFIG_POSIX_DEVICE_IO_ALIAS_READ
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FUNC_ALIAS(read, _read, ssize_t);
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#endif
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int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout)
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{
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/* TODO: create zvfs_select() and dispatch to subsystems based on file type */
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return zsock_select(nfds, readfds, writefds, exceptfds, (struct zsock_timeval *)timeout);
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}
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ssize_t write(int fd, const void *buf, size_t sz)
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{
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return zvfs_write(fd, buf, sz);
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}
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#ifdef CONFIG_POSIX_DEVICE_IO_ALIAS_WRITE
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FUNC_ALIAS(write, _write, ssize_t);
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#endif
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