diff --git a/pipe2.c b/pipe2.c new file mode 100644 index 0000000..bbc99db --- /dev/null +++ b/pipe2.c @@ -0,0 +1,55 @@ +/* + * linux/fs/pipe.c + * + * (C) 1991 Linus Torvalds + */ + +#include + +#include +#include /* for get_free_page */ +#include + + +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 && if_count++; + if (j==1) + f[0]->f_count=0; + if (j<2) + return -1; + j=0; + for(i=0;j<2 && ifilp[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; +}