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-rw-r--r--sys/include/sys/filedesc.h7
-rw-r--r--sys/kern/kern_descrip.c233
-rw-r--r--sys/kern/vfs_syscalls.c181
3 files changed, 244 insertions, 177 deletions
diff --git a/sys/include/sys/filedesc.h b/sys/include/sys/filedesc.h
index dbac349..f5f24db 100644
--- a/sys/include/sys/filedesc.h
+++ b/sys/include/sys/filedesc.h
@@ -43,4 +43,11 @@ struct filedesc {
struct spinlock lock;
};
+int fd_close(unsigned int fd);
+int fd_read(unsigned int fd, void *buf, size_t count);
+
+int fd_alloc(struct filedesc **fd_out);
+int fd_open(const char *pathname, int flags);
+struct filedesc *fd_get(unsigned int fdno);
+
#endif /* !_SYS_FILEDESC_H_ */
diff --git a/sys/kern/kern_descrip.c b/sys/kern/kern_descrip.c
new file mode 100644
index 0000000..adc5027
--- /dev/null
+++ b/sys/kern/kern_descrip.c
@@ -0,0 +1,233 @@
+/*
+ * 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/atomic.h>
+#include <sys/errno.h>
+#include <sys/proc.h>
+#include <sys/limits.h>
+#include <sys/namei.h>
+#include <sys/filedesc.h>
+#include <sys/systm.h>
+#include <vm/dynalloc.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.
+ */
+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->refcnt = 1;
+ fd->fdno = i;
+ td->fds[i] = fd;
+
+ if (fd_out != NULL)
+ *fd_out = fd;
+
+ return 0;
+ }
+
+ return -EMFILE;
+}
+
+/*
+ * Fetch a file descriptor from a file descriptor
+ * number.
+ *
+ * @fdno: File descriptor to fetch
+ */
+struct filedesc *
+fd_get(unsigned int fdno)
+{
+ struct proc *td = this_td();
+
+ if (fdno > PROC_MAX_FILEDES) {
+ return NULL;
+ }
+
+ return td->fds[fdno];
+}
+
+/*
+ * Close a file descriptor with a file
+ * descriptor number.
+ *
+ * @fd: File descriptor number to close.
+ */
+int
+fd_close(unsigned int fd)
+{
+ struct filedesc *filedes;
+ struct proc *td;
+
+ if ((filedes = fd_get(fd)) == NULL) {
+ return -EBADF;
+ }
+
+ /* Return if other threads still hold a ref */
+ if (atomic_dec_int(&filedes->refcnt) > 0) {
+ return 0;
+ }
+
+ td = this_td();
+
+ /*
+ * Each file descriptor structure references a vnode,
+ * we want to reclaim it or at the very least drop
+ * one of its references. After we've cleaned up within
+ * the file descriptor, we can clear it from the fd table
+ * and free up the memory for it.
+ */
+ vfs_release_vnode(filedes->vp);
+ td->fds[fd] = NULL;
+ dynfree(filedes);
+ return 0;
+}
+
+/*
+ * Read bytes from a file using a file
+ * descriptor number.
+ *
+ * @fd: File descriptor number.
+ * @buf: Buffer to read into.
+ * @count: Number of bytes to read.
+ */
+int
+fd_read(unsigned int fd, void *buf, size_t count)
+{
+ char *kbuf = NULL;
+ struct filedesc *filedes;
+ struct sio_txn sio;
+ scret_t retval = 0;
+
+ if (count > SSIZE_MAX) {
+ retval = -EINVAL;
+ goto done;
+ }
+
+ filedes = fd_get(fd);
+ kbuf = dynalloc(count);
+
+ if (kbuf == NULL) {
+ retval = -ENOMEM;
+ goto done;
+ }
+
+ if (filedes == NULL) {
+ retval = -EBADF;
+ goto done;
+ }
+
+ if (filedes->is_dir) {
+ retval = -EISDIR;
+ goto done;
+ }
+
+ sio.len = count;
+ sio.buf = kbuf;
+ sio.offset = filedes->offset;
+
+ if ((count = vfs_vop_read(filedes->vp, &sio)) < 0) {
+ retval = -EIO;
+ goto done;
+ }
+
+ if (copyout(kbuf, buf, count) < 0) {
+ retval = -EFAULT;
+ goto done;
+ }
+
+ retval = count;
+done:
+ if (kbuf != NULL) {
+ dynfree(kbuf);
+ }
+ return retval;
+}
+
+/*
+ * Open a file and get a file descriptor
+ * number.
+ *
+ * @pathname: Path of file to open.
+ * @flags: Flags to use.
+ *
+ * TODO: Use of flags.
+ */
+int
+fd_open(const char *pathname, int flags)
+{
+ int error;
+ char pathbuf[PATH_MAX];
+ struct filedesc *filedes;
+ struct nameidata nd;
+
+ 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;
+}
diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c
index 77070ab..f4c5c59 100644
--- a/sys/kern/vfs_syscalls.c
+++ b/sys/kern/vfs_syscalls.c
@@ -28,83 +28,11 @@
*/
#include <sys/vfs.h>
-#include <sys/vnode.h>
#include <sys/types.h>
-#include <sys/systm.h>
-#include <sys/errno.h>
-#include <sys/sio.h>
#include <sys/filedesc.h>
-#include <sys/atomic.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>
/*
- * Fetch a file descriptor from a file descriptor
- * number.
- *
- * @fdno: File descriptor to fetch
- */
-static struct filedesc *
-fd_get(int fdno)
-{
- struct proc *td = this_td();
-
- if (fdno < 0 || fdno > PROC_MAX_FILEDES) {
- return NULL;
- }
-
- return td->fds[fdno];
-}
-
-/*
- * 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->refcnt = 1;
- fd->fdno = i;
- td->fds[i] = fd;
-
- if (fd_out != NULL)
- *fd_out = fd;
-
- return 0;
- }
-
- return -EMFILE;
-}
-
-/*
* arg0: pathname
* arg1: oflags
*
@@ -113,31 +41,7 @@ fd_alloc(struct filedesc **fd_out)
scret_t
sys_open(struct syscall_args *scargs)
{
- int error;
- const char *pathname;
- char pathbuf[PATH_MAX];
- struct filedesc *filedes;
- struct nameidata nd;
-
- pathname = (char *)scargs->arg0;
- 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;
+ return fd_open((char *)scargs->arg0, scargs->arg1);
}
/*
@@ -146,32 +50,7 @@ sys_open(struct syscall_args *scargs)
scret_t
sys_close(struct syscall_args *args)
{
- struct filedesc *filedes;
- struct proc *td;
- int fd = args->arg0;
-
- if ((filedes = fd_get(fd)) == NULL) {
- return -EBADF;
- }
-
- /* Return if other threads still hold a ref */
- if (atomic_dec_int(&filedes->refcnt) > 0) {
- return 0;
- }
-
- td = this_td();
-
- /*
- * Each file descriptor structure references a vnode,
- * we want to reclaim it or at the very least drop
- * one of its references. After we've cleaned up within
- * the file descriptor, we can clear it from the fd table
- * and free up the memory for it.
- */
- vfs_release_vnode(filedes->vp);
- td->fds[fd] = NULL;
- dynfree(filedes);
- return 0;
+ return fd_close(args->arg0);
}
/*
@@ -182,58 +61,6 @@ sys_close(struct syscall_args *args)
scret_t
sys_read(struct syscall_args *scargs)
{
- int fd;
- char *buf, *kbuf = NULL;
- size_t count;
- struct filedesc *filedes;
- struct sio_txn sio;
- scret_t retval = 0;
-
- fd = scargs->arg0;
- buf = (char *)scargs->arg1;
- count = scargs->arg2;
-
- if (count > SSIZE_MAX) {
- retval = -EINVAL;
- goto done;
- }
-
- filedes = fd_get(fd);
- kbuf = dynalloc(count);
-
- if (kbuf == NULL) {
- retval = -ENOMEM;
- goto done;
- }
-
- if (filedes == NULL) {
- retval = -EBADF;
- goto done;
- }
-
- if (filedes->is_dir) {
- retval = -EISDIR;
- goto done;
- }
-
- sio.len = count;
- sio.buf = kbuf;
- sio.offset = filedes->offset;
-
- if ((count = vfs_vop_read(filedes->vp, &sio)) < 0) {
- retval = -EIO;
- goto done;
- }
-
- if (copyout(kbuf, buf, count) < 0) {
- retval = -EFAULT;
- goto done;
- }
-
- retval = count;
-done:
- if (kbuf != NULL) {
- dynfree(kbuf);
- }
- return retval;
+ return fd_read(scargs->arg0, (void *)scargs->arg1,
+ scargs->arg2);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-22 10:17:51 +0000