From fab307311f6e1e87f1c3580b03c5a3e36d1b2645 Mon Sep 17 00:00:00 2001 From: Ian Moffett Date: Tue, 29 Oct 2024 18:34:24 -0400 Subject: kernel: syscall: Add SYS_stat Signed-off-by: Ian Moffett --- sys/include/sys/stat.h | 49 +++++++++++++++++++++++++++++++++++++ sys/include/sys/syscall.h | 1 + sys/include/sys/vfs.h | 1 + sys/kern/kern_syscall.c | 1 + sys/kern/vfs_syscalls.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 113 insertions(+) create mode 100644 sys/include/sys/stat.h (limited to 'sys') diff --git a/sys/include/sys/stat.h b/sys/include/sys/stat.h new file mode 100644 index 0000000..a59c2b9 --- /dev/null +++ b/sys/include/sys/stat.h @@ -0,0 +1,49 @@ +/* + * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team. + * 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 Hyra 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 _SYS_STAT_H_ +#define _SYS_STAT_H_ + +#include + +struct stat { + dev_t st_dev; + ino_t st_ino; + mode_t st_mode; + nlink_t st_nlink; + uid_t st_uid; + gid_t st_guid; + dev_t st_rdev; + off_t st_size; + time_t st_atime; + time_t st_mtime; + time_t st_ctime; +}; + +#endif /* _SYS_STAT_H_ */ diff --git a/sys/include/sys/syscall.h b/sys/include/sys/syscall.h index a4b12d3..b9e1d09 100644 --- a/sys/include/sys/syscall.h +++ b/sys/include/sys/syscall.h @@ -40,6 +40,7 @@ #define SYS_open 2 #define SYS_read 3 #define SYS_close 4 +#define SYS_stat 5 #if defined(_KERNEL) /* Syscall return value and arg type */ diff --git a/sys/include/sys/vfs.h b/sys/include/sys/vfs.h index 776ee66..0ec190e 100644 --- a/sys/include/sys/vfs.h +++ b/sys/include/sys/vfs.h @@ -38,6 +38,7 @@ scret_t sys_open(struct syscall_args *scargs); scret_t sys_close(struct syscall_args *args); scret_t sys_read(struct syscall_args *scargs); +scret_t sys_stat(struct syscall_args *scargs); #endif /* _KERNEL */ #endif /* !_SYS_VFS_H_ */ diff --git a/sys/kern/kern_syscall.c b/sys/kern/kern_syscall.c index b36c6af..f4d9cb8 100644 --- a/sys/kern/kern_syscall.c +++ b/sys/kern/kern_syscall.c @@ -38,6 +38,7 @@ scret_t(*g_sctab[])(struct syscall_args *) = { sys_open, /* SYS_open */ sys_read, /* SYS_read */ sys_close, /* SYS_close */ + sys_stat, /* SYS_stat */ }; const size_t MAX_SYSCALLS = NELEM(g_sctab); diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c index f4c5c59..0ef3d42 100644 --- a/sys/kern/vfs_syscalls.c +++ b/sys/kern/vfs_syscalls.c @@ -28,10 +28,61 @@ */ #include +#include +#include +#include +#include +#include +#include +#include #include #include #include +static int +vfs_dostat(const char *path, struct stat *sbuf) +{ + char pathbuf[PATH_MAX]; + struct vattr *attr; + struct stat st; + struct vnode *vp; + struct vop_getattr_args gattr; + struct nameidata nd; + int error; + + if (sbuf == NULL || path == NULL) { + return -EINVAL; + } + + if ((copyinstr(path, pathbuf, sizeof(path))) < 0) { + return -EFAULT; + } + + nd.path = path; + nd.flags = 0; + + if ((error = namei(&nd)) != 0) { + return error; + } + + vp = nd.vp; + gattr.vp = vp; + error = vfs_vop_getattr(vp, &gattr); + + if (error != 0) { + return error; + } + + attr = gattr.res; + memset(&st, VNOVAL, sizeof(st)); + + /* Copy stat data to userspace statbuf */ + st.st_mode = attr->mode; + st.st_size = attr->size; + copyout(&st, sbuf, sizeof(*sbuf)); + return 0; +} + /* * arg0: pathname * arg1: oflags @@ -64,3 +115,13 @@ sys_read(struct syscall_args *scargs) return fd_read(scargs->arg0, (void *)scargs->arg1, scargs->arg2); } + +/* + * arg0: path + * arg1: buf + */ +scret_t +sys_stat(struct syscall_args *scargs) +{ + return vfs_dostat((const char *)scargs->arg0, (void *)scargs->arg1); +} -- cgit v1.2.3