add directory kernel

2024-02-19 00:24:53 -05:00
parent eec934fe6c
commit a4964ba92d
749 changed files with 100620 additions and 0 deletions
--- a/kernel/0.95/linux-0.95/fs/pipe.c
+++ b/kernel/0.95/linux-0.95/fs/pipe.c
@@ -0,0 +1,131 @@
+/*
+ *  linux/fs/pipe.c
+ *
+ *  (C) 1991  Linus Torvalds
+ */
+
+#include <signal.h>
+#include <errno.h>
+#include <termios.h>
+#include <fcntl.h>
+
+#include <linux/sched.h>
+#include <asm/segment.h>
+#include <linux/kernel.h>
+
+int pipe_read(struct inode * inode, struct file * filp, char * buf, int count)
+{
+	int chars, size, read = 0;
+
+	if (!(filp->f_flags & O_NONBLOCK))
+		while (!PIPE_SIZE(*inode)) {
+			wake_up(& PIPE_WRITE_WAIT(*inode));
+			if (inode->i_count != 2) /* are there any writers? */
+				return 0;
+			if (current->signal & ~current->blocked)
+				return -ERESTARTSYS;
+			interruptible_sleep_on(& PIPE_READ_WAIT(*inode));
+		}
+	while (count>0 && (size = PIPE_SIZE(*inode))) {
+		chars = PAGE_SIZE-PIPE_TAIL(*inode);
+		if (chars > count)
+			chars = count;
+		if (chars > size)
+			chars = size;
+		count -= chars;
+		read += chars;
+		size = PIPE_TAIL(*inode);
+		PIPE_TAIL(*inode) += chars;
+		PIPE_TAIL(*inode) &= (PAGE_SIZE-1);
+		while (chars-->0)
+			put_fs_byte(((char *)inode->i_size)[size++],buf++);
+	}
+	wake_up(& PIPE_WRITE_WAIT(*inode));
+	return read;
+}
+	
+int pipe_write(struct inode * inode, struct file * filp, char * buf, int count)
+{
+	int chars, size, written = 0;
+
+	while (count>0) {
+		while (!(size=(PAGE_SIZE-1)-PIPE_SIZE(*inode))) {
+			wake_up(& PIPE_READ_WAIT(*inode));
+			if (inode->i_count != 2) { /* no readers */
+				current->signal |= (1<<(SIGPIPE-1));
+				return written?written:-EINTR;
+			}
+			if (current->signal & ~current->blocked)
+				return written?written:-EINTR;
+			interruptible_sleep_on(&PIPE_WRITE_WAIT(*inode));
+		}
+		chars = PAGE_SIZE-PIPE_HEAD(*inode);
+		if (chars > count)
+			chars = count;
+		if (chars > size)
+			chars = size;
+		count -= chars;
+		written += chars;
+		size = PIPE_HEAD(*inode);
+		PIPE_HEAD(*inode) += chars;
+		PIPE_HEAD(*inode) &= (PAGE_SIZE-1);
+		while (chars-->0)
+			((char *)inode->i_size)[size++]=get_fs_byte(buf++);
+	}
+	wake_up(& PIPE_READ_WAIT(*inode));
+	return written;
+}
+
+int sys_pipe(unsigned long * fildes)
+{
+	struct inode * inode;
+	struct file * f[2];
+	int fd[2];
+	int i,j;
+
+	j=0;
+	for(i=0;j<2 && i<NR_FILE;i++)
+		if (!file_table[i].f_count)
+			(f[j++]=i+file_table)->f_count++;
+	if (j==1)
+		f[0]->f_count=0;
+	if (j<2)
+		return -1;
+	j=0;
+	for(i=0;j<2 && i<NR_OPEN;i++)
+		if (!current->filp[i]) {
+			current->filp[ fd[j]=i ] = f[j];
+			j++;
+		}
+	if (j==1)
+		current->filp[fd[0]]=NULL;
+	if (j<2) {
+		f[0]->f_count=f[1]->f_count=0;
+		return -1;
+	}
+	if (!(inode=get_pipe_inode())) {
+		current->filp[fd[0]] =
+			current->filp[fd[1]] = NULL;
+		f[0]->f_count = f[1]->f_count = 0;
+		return -1;
+	}
+	f[0]->f_inode = f[1]->f_inode = inode;
+	f[0]->f_pos = f[1]->f_pos = 0;
+	f[0]->f_mode = 1;		/* read */
+	f[1]->f_mode = 2;		/* write */
+	put_fs_long(fd[0],0+fildes);
+	put_fs_long(fd[1],1+fildes);
+	return 0;
+}
+
+int pipe_ioctl(struct inode *pino, int cmd, int arg)
+{
+	switch (cmd) {
+		case FIONREAD:
+			verify_area((void *) arg,4);
+			put_fs_long(PIPE_SIZE(*pino),(unsigned long *) arg);
+			return 0;
+		default:
+			return -EINVAL;
+	}
+}