diff options
Diffstat (limited to 'sys/kern')
| -rw-r--r-- | sys/kern/kern_syscall.c | 2 | ||||
| -rw-r--r-- | sys/kern/vfs_syscalls.c | 123 |
2 files changed, 125 insertions, 0 deletions
diff --git a/sys/kern/kern_syscall.c b/sys/kern/kern_syscall.c index 1a750cc..2c81d2c 100644 --- a/sys/kern/kern_syscall.c +++ b/sys/kern/kern_syscall.c @@ -30,10 +30,12 @@ #include <sys/syscall.h> #include <sys/types.h> #include <sys/proc.h> +#include <sys/vfs.h> scret_t(*g_sctab[])(struct syscall_args *) = { NULL, /* SYS_none */ sys_exit, /* SYS_exit */ + sys_open, /* SYS_open */ }; const size_t MAX_SYSCALLS = NELEM(g_sctab); diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c new file mode 100644 index 0000000..477bc81 --- /dev/null +++ b/sys/kern/vfs_syscalls.c @@ -0,0 +1,123 @@ +/* + * 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. + */ + +#include <sys/vfs.h> +#include <sys/vnode.h> +#include <sys/types.h> +#include <sys/systm.h> +#include <sys/errno.h> +#include <sys/filedesc.h> +#include <sys/namei.h> +#include <sys/proc.h> +#include <sys/limits.h> +#include <sys/syslog.h> +#include <vm/dynalloc.h> +#include <assert.h> +#include <string.h> + +/* + * Allocate a file descriptor. + * + * @fd_out: Pointer to allocated file descriptor output. + * + * This routine will create a new file descriptor + * table entry. + * + * Returns 0 on success. + */ +static int +fd_alloc(struct filedesc **fd_out) +{ + struct filedesc *fd; + struct proc *td = this_td(); + + /* Find free fd table entry */ + for (size_t i = 3; i < PROC_MAX_FILEDES; ++i) { + if (td->fds[i] != NULL) { + /* In use */ + continue; + } + + fd = dynalloc(sizeof(struct filedesc)); + memset(fd, 0, sizeof(struct filedesc)); + + if (fd == NULL) { + return -ENOMEM; + } + + fd->fdno = i; + td->fds[i] = fd; + + if (fd_out != NULL) + *fd_out = fd; + + return 0; + } + + return -EMFILE; +} + +/* + * arg0: pathname + * arg1: oflags + * + * TODO: Use oflags. + */ +scret_t +sys_open(struct syscall_args *scargs) +{ + int error; + const char *pathname; + char pathbuf[PATH_MAX]; + struct proc *td; + struct filedesc *filedes; + struct nameidata nd; + + pathname = (char *)scargs->arg0; + td = this_td(); + + nd.path = pathbuf; + nd.flags = 0; + + if (copyinstr(pathname, pathbuf, PATH_MAX) < 0) { + return -EFAULT; + } + + if ((error = namei(&nd)) < 0) { + return error; + } + + if ((error = fd_alloc(&filedes)) != 0) { + vfs_release_vnode(nd.vp); + return error; + } + + filedes->vp = nd.vp; + return filedes->fdno; +} |