/*===========================================================================* * do_pipe * *===========================================================================*/ PUBLIC int do_pipe() { /* Perform the pipe(fil_des) system call. */ register struct fproc *rfp; int r; struct filp *fil_ptr0, *fil_ptr1; int fil_des[2]; /* reply goes here */ struct vnode *vp; struct vmnt *vmp; struct node_details res; /* See if a free vnode is available */ if ( (vp = get_free_vnode()) == NIL_VNODE) return(err_code); /* Acquire two file descriptors. */ rfp = fp; if ((r = get_fd(0, R_BIT, &fil_des[0], &fil_ptr0)) != OK) return(r); rfp->fp_filp[fil_des[0]] = fil_ptr0; FD_SET(fil_des[0], &rfp->fp_filp_inuse); fil_ptr0->filp_count = 1; if ((r = get_fd(0, W_BIT, &fil_des[1], &fil_ptr1)) != OK) { rfp->fp_filp[fil_des[0]] = NIL_FILP; FD_CLR(fil_des[0], &rfp->fp_filp_inuse); fil_ptr0->filp_count = 0; return(r); } rfp->fp_filp[fil_des[1]] = fil_ptr1; FD_SET(fil_des[1], &rfp->fp_filp_inuse); fil_ptr1->filp_count = 1; /* Create a named pipe inode on PipeFS */ r = req_newnode(PFS_PROC_NR, fp->fp_effuid, fp->fp_effgid, I_NAMED_PIPE, (dev_t) 0, &res); if (r != OK) { rfp->fp_filp[fil_des[0]] = NIL_FILP; FD_CLR(fil_des[0], &rfp->fp_filp_inuse); fil_ptr0->filp_count = 0; rfp->fp_filp[fil_des[1]] = NIL_FILP; FD_CLR(fil_des[1], &rfp->fp_filp_inuse); fil_ptr1->filp_count = 0; return(r); } /* Fill in vnode */ vp->v_fs_e = res.fs_e; vp->v_mapfs_e = res.fs_e; vp->v_inode_nr = res.inode_nr; vp->v_mapinode_nr = res.inode_nr; vp->v_mode = res.fmode; vp->v_pipe = I_PIPE; vp->v_pipe_rd_pos= 0; vp->v_pipe_wr_pos= 0; vp->v_fs_count = 1; vp->v_mapfs_count = 1; vp->v_ref_count = 1; vp->v_size = 0; vp->v_vmnt = NIL_VMNT; vp->v_dev = NO_DEV; /* Fill in filp objects */ fil_ptr0->filp_vno = vp; dup_vnode(vp); fil_ptr1->filp_vno = vp; fil_ptr0->filp_flags = O_RDONLY; fil_ptr1->filp_flags = O_WRONLY; m_out.reply_i1 = fil_des[0]; m_out.reply_i2 = fil_des[1]; return(OK); }
/*===========================================================================* * do_pipe * *===========================================================================*/ PUBLIC int do_pipe() { /* Perform the pipe(fil_des) system call. */ register struct fproc *rfp; int r; struct filp *fil_ptr0, *fil_ptr1; int fil_des[2]; /* reply goes here */ struct vnode *vp; struct node_details res; /* See if a free vnode is available */ if ( (vp = get_free_vnode()) == NULL) return(err_code); /* Acquire two file descriptors. */ rfp = fp; /* Check if process can open 2 more files */ if(rfp->fp_openfd + 1 >= (unsigned int)rfp->fp_nofilelim.rlim_cur && rfp->fp_nofilelim.rlim_cur != RLIM_INFINITY) return(EMFILE); if ((r = get_fd(0, R_BIT, &fil_des[0], &fil_ptr0)) != OK) return(r); rfp->fp_filp[fil_des[0]] = fil_ptr0; FD_SET(fil_des[0], &rfp->fp_filp_inuse); fil_ptr0->filp_count = 1; if ((r = get_fd(0, W_BIT, &fil_des[1], &fil_ptr1)) != OK) { rfp->fp_filp[fil_des[0]] = NULL; FD_CLR(fil_des[0], &rfp->fp_filp_inuse); fil_ptr0->filp_count = 0; return(r); } rfp->fp_filp[fil_des[1]] = fil_ptr1; FD_SET(fil_des[1], &rfp->fp_filp_inuse); fil_ptr1->filp_count = 1; /* Create a named pipe inode on PipeFS */ r = req_newnode(PFS_PROC_NR, fp->fp_effuid, fp->fp_effgid, I_NAMED_PIPE, NO_DEV, &res); if (r != OK) { rfp->fp_filp[fil_des[0]] = NULL; FD_CLR(fil_des[0], &rfp->fp_filp_inuse); fil_ptr0->filp_count = 0; rfp->fp_filp[fil_des[1]] = NULL; FD_CLR(fil_des[1], &rfp->fp_filp_inuse); fil_ptr1->filp_count = 0; return(r); } /* 2 new files openned */ rfp->fp_openfd+=2; /* Fill in vnode */ vp->v_fs_e = res.fs_e; vp->v_mapfs_e = res.fs_e; vp->v_inode_nr = res.inode_nr; vp->v_mapinode_nr = res.inode_nr; vp->v_mode = res.fmode; vp->v_pipe = I_PIPE; vp->v_pipe_rd_pos= 0; vp->v_pipe_wr_pos= 0; vp->v_fs_count = 1; vp->v_mapfs_count = 1; vp->v_ref_count = 1; vp->v_size = 0; vp->v_vmnt = NULL; vp->v_dev = NO_DEV; /* Fill in filp objects */ fil_ptr0->filp_vno = vp; dup_vnode(vp); fil_ptr1->filp_vno = vp; fil_ptr0->filp_flags = O_RDONLY; fil_ptr1->filp_flags = O_WRONLY; m_out.reply_i1 = fil_des[0]; m_out.reply_i2 = fil_des[1]; return(OK); }
/*===========================================================================* * do_pipe * *===========================================================================*/ int do_pipe() { /* Perform the pipe(fil_des) system call. */ register struct fproc *rfp; int r; struct filp *fil_ptr0, *fil_ptr1; int fil_des[2]; /* reply goes here */ struct vnode *vp; struct vmnt *vmp; struct node_details res; /* Get a lock on PFS */ if ((vmp = find_vmnt(PFS_PROC_NR)) == NULL) panic("PFS gone"); if ((r = lock_vmnt(vmp, VMNT_READ)) != OK) return(r); /* See if a free vnode is available */ if ((vp = get_free_vnode()) == NULL) { unlock_vmnt(vmp); return(err_code); } lock_vnode(vp, VNODE_OPCL); /* Acquire two file descriptors. */ rfp = fp; if ((r = get_fd(0, R_BIT, &fil_des[0], &fil_ptr0)) != OK) { unlock_vnode(vp); unlock_vmnt(vmp); return(r); } rfp->fp_filp[fil_des[0]] = fil_ptr0; FD_SET(fil_des[0], &rfp->fp_filp_inuse); fil_ptr0->filp_count = 1; /* mark filp in use */ if ((r = get_fd(0, W_BIT, &fil_des[1], &fil_ptr1)) != OK) { rfp->fp_filp[fil_des[0]] = NULL; FD_CLR(fil_des[0], &rfp->fp_filp_inuse); fil_ptr0->filp_count = 0; /* mark filp free */ unlock_filp(fil_ptr0); unlock_vnode(vp); unlock_vmnt(vmp); return(r); } rfp->fp_filp[fil_des[1]] = fil_ptr1; FD_SET(fil_des[1], &rfp->fp_filp_inuse); fil_ptr1->filp_count = 1; /* Create a named pipe inode on PipeFS */ r = req_newnode(PFS_PROC_NR, fp->fp_effuid, fp->fp_effgid, I_NAMED_PIPE, NO_DEV, &res); if (r != OK) { rfp->fp_filp[fil_des[0]] = NULL; FD_CLR(fil_des[0], &rfp->fp_filp_inuse); fil_ptr0->filp_count = 0; rfp->fp_filp[fil_des[1]] = NULL; FD_CLR(fil_des[1], &rfp->fp_filp_inuse); fil_ptr1->filp_count = 0; unlock_filp(fil_ptr1); unlock_filp(fil_ptr0); unlock_vnode(vp); unlock_vmnt(vmp); return(r); } /* Fill in vnode */ vp->v_fs_e = res.fs_e; vp->v_mapfs_e = res.fs_e; vp->v_inode_nr = res.inode_nr; vp->v_mapinode_nr = res.inode_nr; vp->v_mode = res.fmode; vp->v_fs_count = 1; vp->v_mapfs_count = 1; vp->v_ref_count = 1; vp->v_size = 0; vp->v_vmnt = NULL; vp->v_dev = NO_DEV; /* Fill in filp objects */ fil_ptr0->filp_vno = vp; dup_vnode(vp); fil_ptr1->filp_vno = vp; fil_ptr0->filp_flags = O_RDONLY; fil_ptr1->filp_flags = O_WRONLY; m_out.reply_i1 = fil_des[0]; m_out.reply_i2 = fil_des[1]; unlock_filps(fil_ptr0, fil_ptr1); unlock_vmnt(vmp); return(OK); }
/*===========================================================================* * create_pipe * *===========================================================================*/ static int create_pipe(int fil_des[2], int flags) { register struct fproc *rfp; int r; struct filp *fil_ptr0, *fil_ptr1; struct vnode *vp; struct vmnt *vmp; struct node_details res; /* Get a lock on PFS */ if ((vmp = find_vmnt(PFS_PROC_NR)) == NULL) panic("PFS gone"); if ((r = lock_vmnt(vmp, VMNT_READ)) != OK) return(r); /* See if a free vnode is available */ if ((vp = get_free_vnode()) == NULL) { unlock_vmnt(vmp); return(err_code); } lock_vnode(vp, VNODE_OPCL); /* Acquire two file descriptors. */ rfp = fp; if ((r = get_fd(fp, 0, R_BIT, &fil_des[0], &fil_ptr0)) != OK) { unlock_vnode(vp); unlock_vmnt(vmp); return(r); } rfp->fp_filp[fil_des[0]] = fil_ptr0; fil_ptr0->filp_count = 1; /* mark filp in use */ if ((r = get_fd(fp, 0, W_BIT, &fil_des[1], &fil_ptr1)) != OK) { rfp->fp_filp[fil_des[0]] = NULL; fil_ptr0->filp_count = 0; /* mark filp free */ unlock_filp(fil_ptr0); unlock_vnode(vp); unlock_vmnt(vmp); return(r); } rfp->fp_filp[fil_des[1]] = fil_ptr1; fil_ptr1->filp_count = 1; /* Create a named pipe inode on PipeFS */ r = req_newnode(PFS_PROC_NR, fp->fp_effuid, fp->fp_effgid, I_NAMED_PIPE, NO_DEV, &res); if (r != OK) { rfp->fp_filp[fil_des[0]] = NULL; fil_ptr0->filp_count = 0; rfp->fp_filp[fil_des[1]] = NULL; fil_ptr1->filp_count = 0; unlock_filp(fil_ptr1); unlock_filp(fil_ptr0); unlock_vnode(vp); unlock_vmnt(vmp); return(r); } /* Fill in vnode */ vp->v_fs_e = res.fs_e; vp->v_mapfs_e = res.fs_e; vp->v_inode_nr = res.inode_nr; vp->v_mapinode_nr = res.inode_nr; vp->v_mode = res.fmode; vp->v_fs_count = 1; vp->v_mapfs_count = 1; vp->v_ref_count = 1; vp->v_size = 0; vp->v_vmnt = NULL; vp->v_dev = NO_DEV; /* Fill in filp objects */ fil_ptr0->filp_vno = vp; dup_vnode(vp); fil_ptr1->filp_vno = vp; fil_ptr0->filp_flags = O_RDONLY | (flags & ~O_ACCMODE); fil_ptr1->filp_flags = O_WRONLY | (flags & ~O_ACCMODE); if (flags & O_CLOEXEC) { FD_SET(fil_des[0], &rfp->fp_cloexec_set); FD_SET(fil_des[1], &rfp->fp_cloexec_set); } unlock_filps(fil_ptr0, fil_ptr1); unlock_vmnt(vmp); return(OK); }