From 831fe7b239a84f18c369b408c47f69dc9f6b9210 Mon Sep 17 00:00:00 2001
From: mse5gj3yn <780736178@qq.com>
Date: Fri, 9 Jul 2021 00:10:39 +0800
Subject: [PATCH] ADD file via upload

---
 pipe2_1.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 pipe2_1.c

diff --git a/pipe2_1.c b/pipe2_1.c
new file mode 100644
index 0000000..bbc99db
--- /dev/null
+++ b/pipe2_1.c
@@ -0,0 +1,55 @@
+/*
+ *  linux/fs/pipe.c
+ *
+ *  (C) 1991  Linus Torvalds
+ */
+
+#include <signal.h>
+
+#include <linux/sched.h>
+#include <linux/mm.h>	/* for get_free_page */
+#include <asm/segment.h>
+
+
+int sys_pipe2(unsigned long * fildes,int flag)
+{
+	struct m_inode * inode;
+	struct file * f[2];
+	int fd[2];
+	int i,j;
+	if(flag==0){
+		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;
+}