1996-01-28 23:38:26 +00:00
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/*
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* Copyright (c) 1996 John S. Dyson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice immediately at the beginning of the file, without modification,
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* this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Absolutely no warranty of function or purpose is made by the author
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* John S. Dyson.
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* 4. This work was done expressly for inclusion into FreeBSD. Other use
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* is allowed if this notation is included.
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* 5. Modifications may be freely made to this file if the above conditions
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* are met.
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*
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1996-01-31 02:05:12 +00:00
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* $Id: sys_pipe.c,v 1.2 1996/01/29 02:57:33 dyson Exp $
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1996-01-28 23:38:26 +00:00
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*/
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#ifndef OLD_PIPE
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/*
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* This file contains a high-performance replacement for the socket-based
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* pipes scheme originally used in FreeBSD/4.4Lite. It does not support
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* all features of sockets, but does do everything that pipes normally
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* do.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/file.h>
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#include <sys/protosw.h>
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#include <sys/stat.h>
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#include <sys/filedesc.h>
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#include <sys/malloc.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/select.h>
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#include <sys/signalvar.h>
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#include <sys/errno.h>
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#include <sys/queue.h>
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#include <sys/vmmeter.h>
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#include <sys/kernel.h>
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#include <sys/sysproto.h>
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#include <sys/pipe.h>
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#include <vm/vm.h>
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#include <vm/vm_prot.h>
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#include <vm/vm_param.h>
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#include <vm/lock.h>
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#include <vm/vm_object.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_extern.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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static int pipe_read __P((struct file *fp, struct uio *uio,
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struct ucred *cred));
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static int pipe_write __P((struct file *fp, struct uio *uio,
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struct ucred *cred));
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static int pipe_close __P((struct file *fp, struct proc *p));
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static int pipe_select __P((struct file *fp, int which, struct proc *p));
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static int pipe_ioctl __P((struct file *fp, int cmd, caddr_t data, struct proc *p));
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static struct fileops pipeops =
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{ pipe_read, pipe_write, pipe_ioctl, pipe_select, pipe_close };
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/*
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* Default pipe buffer size(s), this can be kind-of large now because pipe
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* space is pageable. The pipe code will try to maintain locality of
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* reference for performance reasons, so small amounts of outstanding I/O
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* will not wipe the cache.
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*/
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#define PIPESIZE (16384)
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#define MINPIPESIZE (PIPESIZE/3)
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#define MAXPIPESIZE (2*PIPESIZE/3)
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static void pipeclose __P((struct pipe *cpipe));
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static void pipebufferinit __P((struct pipe *cpipe));
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static void pipeinit __P((struct pipe *cpipe));
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static __inline int pipelock __P((struct pipe *cpipe));
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static __inline void pipeunlock __P((struct pipe *cpipe));
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/*
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* The pipe system call for the DTYPE_PIPE type of pipes
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*/
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/* ARGSUSED */
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int
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pipe(p, uap, retval)
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struct proc *p;
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struct pipe_args /* {
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int dummy;
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} */ *uap;
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int retval[];
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{
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register struct filedesc *fdp = p->p_fd;
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struct file *rf, *wf;
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struct pipe *rpipe, *wpipe;
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int fd, error;
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rpipe = malloc( sizeof (*rpipe), M_TEMP, M_WAITOK);
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pipeinit(rpipe);
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wpipe = malloc( sizeof (*wpipe), M_TEMP, M_WAITOK);
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pipeinit(wpipe);
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error = falloc(p, &rf, &fd);
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if (error)
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goto free2;
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retval[0] = fd;
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rf->f_flag = FREAD | FWRITE;
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rf->f_type = DTYPE_PIPE;
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rf->f_ops = &pipeops;
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rf->f_data = (caddr_t)rpipe;
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error = falloc(p, &wf, &fd);
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if (error)
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goto free3;
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wf->f_flag = FREAD | FWRITE;
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wf->f_type = DTYPE_PIPE;
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wf->f_ops = &pipeops;
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wf->f_data = (caddr_t)wpipe;
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retval[1] = fd;
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rpipe->pipe_peer = wpipe;
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wpipe->pipe_peer = rpipe;
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return (0);
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free3:
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ffree(rf);
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fdp->fd_ofiles[retval[0]] = 0;
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free2:
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(void)pipeclose(wpipe);
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free1:
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(void)pipeclose(rpipe);
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return (error);
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}
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/*
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* initialize and allocate VM and memory for pipe
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*/
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static void
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pipeinit(cpipe)
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struct pipe *cpipe;
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{
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1996-01-29 02:57:33 +00:00
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int npages, error;
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1996-01-28 23:38:26 +00:00
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npages = round_page(PIPESIZE)/PAGE_SIZE;
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/*
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* Create an object, I don't like the idea of paging to/from
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* kernel_object.
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*/
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cpipe->pipe_buffer.object = vm_object_allocate(OBJT_DEFAULT, npages);
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1996-01-29 02:57:33 +00:00
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cpipe->pipe_buffer.buffer = (caddr_t) vm_map_min(kernel_map);
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1996-01-28 23:38:26 +00:00
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/*
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* Insert the object into the kernel map, and allocate kva for it.
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* The map entry is, by default, pageable.
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*/
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1996-01-29 02:57:33 +00:00
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error = vm_map_find(kernel_map, cpipe->pipe_buffer.object, 0,
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1996-01-28 23:38:26 +00:00
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(vm_offset_t *) &cpipe->pipe_buffer.buffer, PIPESIZE, 1,
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1996-01-29 02:57:33 +00:00
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VM_PROT_ALL, VM_PROT_ALL, 0);
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if (error != KERN_SUCCESS)
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panic("pipeinit: cannot allocate pipe -- out of kvm -- code = %d", error);
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1996-01-28 23:38:26 +00:00
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cpipe->pipe_buffer.in = 0;
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cpipe->pipe_buffer.out = 0;
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cpipe->pipe_buffer.cnt = 0;
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cpipe->pipe_buffer.size = PIPESIZE;
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cpipe->pipe_state = 0;
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cpipe->pipe_peer = NULL;
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cpipe->pipe_busy = 0;
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cpipe->pipe_ctime = time;
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cpipe->pipe_atime = time;
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cpipe->pipe_mtime = time;
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bzero(&cpipe->pipe_sel, sizeof cpipe->pipe_sel);
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}
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/*
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* lock a pipe for I/O, blocking other access
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*/
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static __inline int
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pipelock(cpipe)
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struct pipe *cpipe;
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{
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while (cpipe->pipe_state & PIPE_LOCK) {
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cpipe->pipe_state |= PIPE_LWANT;
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if (tsleep( &cpipe->pipe_state, PRIBIO|PCATCH, "pipelk", 0)) {
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return ERESTART;
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}
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}
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cpipe->pipe_state |= PIPE_LOCK;
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return 0;
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}
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/*
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* unlock a pipe I/O lock
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*/
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static __inline void
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pipeunlock(cpipe)
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struct pipe *cpipe;
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{
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cpipe->pipe_state &= ~PIPE_LOCK;
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if (cpipe->pipe_state & PIPE_LWANT) {
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cpipe->pipe_state &= ~PIPE_LWANT;
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wakeup(&cpipe->pipe_state);
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}
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return;
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}
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/* ARGSUSED */
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static int
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pipe_read(fp, uio, cred)
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struct file *fp;
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struct uio *uio;
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struct ucred *cred;
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{
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struct pipe *rpipe = (struct pipe *) fp->f_data;
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int error = 0;
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int nread = 0;
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++rpipe->pipe_busy;
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while (uio->uio_resid) {
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if (rpipe->pipe_buffer.cnt > 0) {
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int size = rpipe->pipe_buffer.size - rpipe->pipe_buffer.out;
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if (size > rpipe->pipe_buffer.cnt)
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size = rpipe->pipe_buffer.cnt;
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if (size > uio->uio_resid)
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size = uio->uio_resid;
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if ((error = pipelock(rpipe)) == 0) {
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error = uiomove( &rpipe->pipe_buffer.buffer[rpipe->pipe_buffer.out],
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size, uio);
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pipeunlock(rpipe);
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}
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if (error) {
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break;
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}
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rpipe->pipe_buffer.out += size;
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if (rpipe->pipe_buffer.out >= rpipe->pipe_buffer.size)
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rpipe->pipe_buffer.out = 0;
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rpipe->pipe_buffer.cnt -= size;
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nread += size;
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rpipe->pipe_atime = time;
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} else {
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/*
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* detect EOF condition
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*/
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if (rpipe->pipe_state & PIPE_EOF) {
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break;
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}
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/*
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* If the "write-side" has been blocked, wake it up now.
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*/
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if (rpipe->pipe_state & PIPE_WANTW) {
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rpipe->pipe_state &= ~PIPE_WANTW;
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wakeup(rpipe);
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}
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1996-01-31 02:05:12 +00:00
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if (nread > 0)
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1996-01-28 23:38:26 +00:00
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break;
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1996-01-31 02:05:12 +00:00
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if (rpipe->pipe_state & PIPE_NBIO) {
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error = EAGAIN;
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break;
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}
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1996-01-28 23:38:26 +00:00
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if (rpipe->pipe_peer == NULL)
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break;
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/*
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* If there is no more to read in the pipe, reset
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* it's pointers to the beginning. This improves
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* cache hit stats.
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*/
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if ((error = pipelock(rpipe)) == 0) {
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if (rpipe->pipe_buffer.cnt == 0) {
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rpipe->pipe_buffer.in = 0;
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rpipe->pipe_buffer.out = 0;
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}
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pipeunlock(rpipe);
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} else {
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break;
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}
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rpipe->pipe_state |= PIPE_WANTR;
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if (tsleep(rpipe, PRIBIO|PCATCH, "piperd", 0)) {
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error = ERESTART;
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break;
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}
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}
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}
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--rpipe->pipe_busy;
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if ((rpipe->pipe_busy == 0) && (rpipe->pipe_state & PIPE_WANT)) {
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rpipe->pipe_state &= ~(PIPE_WANT|PIPE_WANTW);
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wakeup(rpipe);
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} else if (rpipe->pipe_buffer.cnt < MINPIPESIZE) {
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/*
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* If there is no more to read in the pipe, reset
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* it's pointers to the beginning. This improves
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* cache hit stats.
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*/
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if ((error == 0) && (error = pipelock(rpipe)) == 0) {
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if (rpipe->pipe_buffer.cnt == 0) {
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rpipe->pipe_buffer.in = 0;
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rpipe->pipe_buffer.out = 0;
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}
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pipeunlock(rpipe);
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}
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|
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/*
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* If the "write-side" has been blocked, wake it up now.
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|
|
*/
|
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|
|
if (rpipe->pipe_state & PIPE_WANTW) {
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rpipe->pipe_state &= ~PIPE_WANTW;
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wakeup(rpipe);
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|
}
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}
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|
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if (rpipe->pipe_state & PIPE_SEL) {
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|
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rpipe->pipe_state &= ~PIPE_SEL;
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|
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selwakeup(&rpipe->pipe_sel);
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}
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return error;
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|
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|
}
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|
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|
|
|
|
/* ARGSUSED */
|
|
|
|
static int
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|
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pipe_write(fp, uio, cred)
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|
|
struct file *fp;
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|
|
struct uio *uio;
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|
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struct ucred *cred;
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|
|
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{
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|
|
struct pipe *rpipe = (struct pipe *) fp->f_data;
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|
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struct pipe *wpipe = rpipe->pipe_peer;
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|
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int error = 0;
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|
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|
|
|
|
/*
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|
|
|
* detect loss of pipe read side, issue SIGPIPE if lost.
|
|
|
|
*/
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|
|
|
if (wpipe == NULL || (wpipe->pipe_state & PIPE_EOF)) {
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|
|
|
psignal(curproc, SIGPIPE);
|
1996-01-31 02:05:12 +00:00
|
|
|
return EPIPE;
|
1996-01-28 23:38:26 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
++wpipe->pipe_busy;
|
|
|
|
while (uio->uio_resid) {
|
|
|
|
int space = wpipe->pipe_buffer.size - wpipe->pipe_buffer.cnt;
|
|
|
|
if (space > 0) {
|
|
|
|
int size = wpipe->pipe_buffer.size - wpipe->pipe_buffer.in;
|
|
|
|
if (size > space)
|
|
|
|
size = space;
|
|
|
|
if (size > uio->uio_resid)
|
|
|
|
size = uio->uio_resid;
|
|
|
|
if ((error = pipelock(wpipe)) == 0) {
|
|
|
|
error = uiomove( &wpipe->pipe_buffer.buffer[wpipe->pipe_buffer.in],
|
|
|
|
size, uio);
|
|
|
|
pipeunlock(wpipe);
|
|
|
|
}
|
|
|
|
if (error)
|
|
|
|
break;
|
|
|
|
|
|
|
|
wpipe->pipe_buffer.in += size;
|
|
|
|
if (wpipe->pipe_buffer.in >= wpipe->pipe_buffer.size)
|
|
|
|
wpipe->pipe_buffer.in = 0;
|
|
|
|
|
|
|
|
wpipe->pipe_buffer.cnt += size;
|
|
|
|
wpipe->pipe_mtime = time;
|
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* If the "read-side" has been blocked, wake it up now.
|
|
|
|
*/
|
|
|
|
if (wpipe->pipe_state & PIPE_WANTR) {
|
|
|
|
wpipe->pipe_state &= ~PIPE_WANTR;
|
|
|
|
wakeup(wpipe);
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* don't block on non-blocking I/O
|
|
|
|
*/
|
|
|
|
if (wpipe->pipe_state & PIPE_NBIO) {
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
wpipe->pipe_state |= PIPE_WANTW;
|
|
|
|
if (tsleep(wpipe, (PRIBIO+1)|PCATCH, "pipewr", 0)) {
|
|
|
|
error = ERESTART;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* If read side wants to go away, we just issue a signal
|
|
|
|
* to ourselves.
|
|
|
|
*/
|
|
|
|
if (wpipe->pipe_state & PIPE_EOF) {
|
|
|
|
psignal(curproc, SIGPIPE);
|
1996-01-31 02:05:12 +00:00
|
|
|
error = EPIPE;
|
1996-01-28 23:38:26 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
--wpipe->pipe_busy;
|
|
|
|
if ((wpipe->pipe_busy == 0) &&
|
|
|
|
(wpipe->pipe_state & PIPE_WANT)) {
|
|
|
|
wpipe->pipe_state &= ~(PIPE_WANT|PIPE_WANTR);
|
|
|
|
wakeup(wpipe);
|
|
|
|
} else if (wpipe->pipe_buffer.cnt > 0) {
|
|
|
|
/*
|
|
|
|
* If we have put any characters in the buffer, we wake up
|
|
|
|
* the reader.
|
|
|
|
*/
|
|
|
|
if (wpipe->pipe_state & PIPE_WANTR) {
|
|
|
|
wpipe->pipe_state &= ~PIPE_WANTR;
|
|
|
|
wakeup(wpipe);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (wpipe->pipe_state & PIPE_SEL) {
|
|
|
|
wpipe->pipe_state &= ~PIPE_SEL;
|
|
|
|
selwakeup(&wpipe->pipe_sel);
|
|
|
|
}
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* we implement a very minimal set of ioctls for compatibility with sockets.
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
pipe_ioctl(fp, cmd, data, p)
|
|
|
|
struct file *fp;
|
|
|
|
int cmd;
|
|
|
|
register caddr_t data;
|
|
|
|
struct proc *p;
|
|
|
|
{
|
|
|
|
register struct pipe *mpipe = (struct pipe *)fp->f_data;
|
|
|
|
|
|
|
|
switch (cmd) {
|
|
|
|
|
|
|
|
case FIONBIO:
|
|
|
|
if (*(int *)data)
|
|
|
|
mpipe->pipe_state |= PIPE_NBIO;
|
|
|
|
else
|
|
|
|
mpipe->pipe_state &= ~PIPE_NBIO;
|
|
|
|
return (0);
|
|
|
|
|
|
|
|
case FIOASYNC:
|
|
|
|
if (*(int *)data) {
|
|
|
|
mpipe->pipe_state |= PIPE_ASYNC;
|
|
|
|
} else {
|
|
|
|
mpipe->pipe_state &= ~PIPE_ASYNC;
|
|
|
|
}
|
|
|
|
return (0);
|
|
|
|
|
|
|
|
case FIONREAD:
|
|
|
|
*(int *)data = mpipe->pipe_buffer.cnt;
|
|
|
|
return (0);
|
|
|
|
|
|
|
|
case SIOCSPGRP:
|
|
|
|
mpipe->pipe_pgid = *(int *)data;
|
|
|
|
return (0);
|
|
|
|
|
|
|
|
case SIOCGPGRP:
|
|
|
|
*(int *)data = mpipe->pipe_pgid;
|
|
|
|
return (0);
|
|
|
|
|
|
|
|
}
|
|
|
|
return ENOSYS;
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
pipe_select(fp, which, p)
|
|
|
|
struct file *fp;
|
|
|
|
int which;
|
|
|
|
struct proc *p;
|
|
|
|
{
|
|
|
|
register struct pipe *rpipe = (struct pipe *)fp->f_data;
|
|
|
|
struct pipe *wpipe;
|
|
|
|
register int s = splnet();
|
|
|
|
|
|
|
|
wpipe = rpipe->pipe_peer;
|
|
|
|
switch (which) {
|
|
|
|
|
|
|
|
case FREAD:
|
|
|
|
if (rpipe->pipe_buffer.cnt > 0) {
|
|
|
|
splx(s);
|
|
|
|
return (1);
|
|
|
|
}
|
|
|
|
selrecord(p, &rpipe->pipe_sel);
|
|
|
|
rpipe->pipe_state |= PIPE_SEL;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case FWRITE:
|
|
|
|
if (wpipe == 0) {
|
|
|
|
splx(s);
|
|
|
|
return (1);
|
|
|
|
}
|
|
|
|
if (wpipe->pipe_buffer.cnt < wpipe->pipe_buffer.size) {
|
|
|
|
splx(s);
|
|
|
|
return (1);
|
|
|
|
}
|
|
|
|
selrecord(p, &wpipe->pipe_sel);
|
|
|
|
wpipe->pipe_state |= PIPE_SEL;
|
|
|
|
break;
|
|
|
|
|
|
|
|
case 0:
|
|
|
|
selrecord(p, &rpipe->pipe_sel);
|
|
|
|
rpipe->pipe_state |= PIPE_SEL;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
splx(s);
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
pipe_stat(pipe, ub)
|
|
|
|
register struct pipe *pipe;
|
|
|
|
register struct stat *ub;
|
|
|
|
{
|
|
|
|
bzero((caddr_t)ub, sizeof (*ub));
|
|
|
|
ub->st_mode = S_IFSOCK;
|
|
|
|
ub->st_blksize = pipe->pipe_buffer.size / 2;
|
|
|
|
ub->st_size = pipe->pipe_buffer.cnt;
|
|
|
|
ub->st_blocks = (ub->st_size + ub->st_blksize - 1) / ub->st_blksize;
|
|
|
|
TIMEVAL_TO_TIMESPEC(&pipe->pipe_atime, &ub->st_atimespec);
|
|
|
|
TIMEVAL_TO_TIMESPEC(&pipe->pipe_mtime, &ub->st_mtimespec);
|
|
|
|
TIMEVAL_TO_TIMESPEC(&pipe->pipe_ctime, &ub->st_ctimespec);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* ARGSUSED */
|
|
|
|
static int
|
|
|
|
pipe_close(fp, p)
|
|
|
|
struct file *fp;
|
|
|
|
struct proc *p;
|
|
|
|
{
|
|
|
|
int error = 0;
|
|
|
|
struct pipe *cpipe = (struct pipe *)fp->f_data;
|
|
|
|
pipeclose(cpipe);
|
|
|
|
fp->f_data = NULL;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* shutdown the pipe
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
pipeclose(cpipe)
|
|
|
|
struct pipe *cpipe;
|
|
|
|
{
|
|
|
|
if (cpipe) {
|
|
|
|
/*
|
|
|
|
* If the other side is blocked, wake it up saying that
|
|
|
|
* we want to close it down.
|
|
|
|
*/
|
|
|
|
while (cpipe->pipe_busy) {
|
|
|
|
wakeup(cpipe);
|
|
|
|
cpipe->pipe_state |= PIPE_WANT|PIPE_EOF;
|
|
|
|
tsleep(cpipe, PRIBIO, "pipecl", 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Disconnect from peer
|
|
|
|
*/
|
|
|
|
if (cpipe->pipe_peer) {
|
|
|
|
cpipe->pipe_peer->pipe_state |= PIPE_EOF;
|
|
|
|
wakeup(cpipe->pipe_peer);
|
|
|
|
cpipe->pipe_peer->pipe_peer = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* free resources
|
|
|
|
*/
|
|
|
|
kmem_free(kernel_map, (vm_offset_t)cpipe->pipe_buffer.buffer,
|
|
|
|
cpipe->pipe_buffer.size);
|
|
|
|
free(cpipe, M_TEMP);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|