From 5a064ce758921ff6e0451506085399c8a82f6f6c Mon Sep 17 00:00:00 2001 From: Ian Moffett Date: Sat, 20 Sep 2025 21:33:49 -0400 Subject: kern: syscall: Add initial write(2) stub Here we add a write(2) stub and add it to the UNIX syscall interface. We also move the UNIX syscall numbers into compat/unix/syscall.h Signed-off-by: Ian Moffett --- src/sys/include/compat/unix/syscall.h | 15 ++++++++++- src/sys/include/os/filedesc.h | 47 +++++++++++++++++++++++++++++++++++ src/sys/include/sys/syscall.h | 6 ----- 3 files changed, 61 insertions(+), 7 deletions(-) create mode 100644 src/sys/include/os/filedesc.h (limited to 'src/sys/include') diff --git a/src/sys/include/compat/unix/syscall.h b/src/sys/include/compat/unix/syscall.h index 2bb699a..daca2dc 100644 --- a/src/sys/include/compat/unix/syscall.h +++ b/src/sys/include/compat/unix/syscall.h @@ -34,15 +34,28 @@ #include #include +/* + * Syscall numbers + */ +#define SYS_none 0x00 +#define SYS_exit 0x01 +#define SYS_write 0x02 + /* * Exit the current process - exit(2) syscall */ scret_t sys_exit(struct syscall_args *scargs); +/* + * Write to a file descriptor - write(2) syscall + */ +scret_t sys_write(struct syscall_args *scargs); + #ifdef _NEED_UNIX_SCTAB scret_t(*g_unix_sctab[])(struct syscall_args *) = { [SYS_none] = NULL, - [SYS_exit] = sys_exit + [SYS_exit] = sys_exit, + [SYS_write] = sys_write }; #endif /* !_NEED_UNIX_SCTAB */ diff --git a/src/sys/include/os/filedesc.h b/src/sys/include/os/filedesc.h new file mode 100644 index 0000000..9d6f229 --- /dev/null +++ b/src/sys/include/os/filedesc.h @@ -0,0 +1,47 @@ +/* + * Copyright (c) 2025 Ian Marco Moffett and L5 engineers + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the project nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef _OS_FILEDESC_H_ +#define _OS_FILEDESC_H_ 1 + +#include + +/* + * Write to a file descriptor + * + * @fd: File descriptor to write to + * @buf: Buffer to write + * @count: Buffer byte count + * + * Returns the number of bytes written on success, otherwise + * a less than zero value on error. + */ +ssize_t write(int fd, const void *buf, size_t count); + +#endif /* !_OS_FILEDESC_H_ */ diff --git a/src/sys/include/sys/syscall.h b/src/sys/include/sys/syscall.h index e0891e6..9d9c765 100644 --- a/src/sys/include/sys/syscall.h +++ b/src/sys/include/sys/syscall.h @@ -33,12 +33,6 @@ #include #include -/* - * Syscall numbers - */ -#define SYS_none 0x00 -#define SYS_exit 0x01 - #if defined(_KERNEL) /* * Acquire a specific syscall argument -- cgit v1.2.3