VFS: implement pipe2
Change-Id: Iedc8042dd73a903456b25ba665d12577f5589ca2
This commit is contained in:
Thomas Veerman
parent
fa78dc389f
commit
473547c777
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@ -1476,6 +1476,7 @@
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./usr/man/man2/open.2 minix-sys
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./usr/man/man2/pause.2 minix-sys
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./usr/man/man2/pipe.2 minix-sys
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./usr/man/man2/pipe2.2 minix-sys
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./usr/man/man2/ptrace.2 minix-sys
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./usr/man/man2/read.2 minix-sys
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./usr/man/man2/readlink.2 minix-sys
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@ -55,6 +55,7 @@
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#define IOCTL 54
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#define FCNTL 55
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#define FS_READY 57
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#define PIPE2 58
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#define EXEC 59
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#define UMASK 60
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#define CHROOT 61
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@ -377,8 +377,8 @@ int initgroups(const char *, gid_t);
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int iruserok(uint32_t, int, const char *, const char *);
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int issetugid(void);
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int nfssvc(int, void *);
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#ifndef __minix
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int pipe2(int *, int);
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#ifndef __minix
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int profil(char *, size_t, u_long, u_int);
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#endif /* !__minix */
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#ifndef __PSIGNAL_DECLARED
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@ -106,8 +106,8 @@ SUBDIR+= pkgconfig
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.include "${.CURDIR}/sys-minix/Makefile.inc"
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.else
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.include "${.CURDIR}/tls/Makefile.inc"
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.include "${.CURDIR}/sys/Makefile.inc"
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.endif
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.include "${.CURDIR}/sys/Makefile.inc"
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.include "${.CURDIR}/uuid/Makefile.inc"
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.if (${MKYP} != "no")
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.include "${.CURDIR}/yp/Makefile.inc"
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@ -57,6 +57,7 @@
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#define inet_aton _inet_aton
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#define inet_pton _inet_pton
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#define pipe _pipe
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#define pipe2 _pipe2
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#define sbrk _sbrk
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#define strerror_r _strerror_r
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#define strlcat _strlcat
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@ -6,15 +6,29 @@
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#ifdef __weak_alias
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__weak_alias(pipe, _pipe)
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__weak_alias(pipe2, _pipe2)
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#endif
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int pipe(fild)
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int fild[2];
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int
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pipe(int fild[2])
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{
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message m;
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message m;
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if (_syscall(VFS_PROC_NR, PIPE, &m) < 0) return(-1);
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fild[0] = m.m1_i1;
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fild[1] = m.m1_i2;
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return(0);
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if (_syscall(VFS_PROC_NR, PIPE, &m) < 0) return(-1);
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fild[0] = m.m1_i1;
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fild[1] = m.m1_i2;
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return(0);
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}
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int
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pipe2(int fild[2], int flags)
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{
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message m;
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m.m1_i3 = flags;
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if (_syscall(VFS_PROC_NR, PIPE2, &m) < 0) return(-1);
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fild[0] = m.m1_i1;
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fild[1] = m.m1_i2;
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return(0);
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}
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@ -1,6 +1,9 @@
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# $NetBSD: Makefile.inc,v 1.217 2012/10/02 01:46:40 christos Exp $
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# @(#)Makefile.inc 8.3 (Berkeley) 10/24/94
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.if defined(__MINIX)
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.PATH: ${.CURDIR}/sys
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.else
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# sys sources
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.PATH: ${ARCHDIR}/sys ${.CURDIR}/sys
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@ -215,7 +218,9 @@ LintSysPseudoNoerr.c: ${LIBCDIR}/sys/makelintstub \
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${_MKTARGET_CREATE}
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CPP=${CPP:Q} ${HOST_SH} ${LIBCDIR}/sys/makelintstub -o ${.TARGET} -p \
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-s ${DESTDIR}/usr/include/sys/syscall.h ${PSEUDONOERR}
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.endif # !defined(__MINIX)
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.if !defined(__MINIX)
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MAN+= accept.2 access.2 acct.2 adjtime.2 bind.2 brk.2 chdir.2 \
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chflags.2 chmod.2 chown.2 chroot.2 clock_settime.2 clone.2 close.2 \
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connect.2 dup.2 execve.2 _exit.2 extattr_get_file.2 \
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@ -237,8 +242,12 @@ MAN+= accept.2 access.2 acct.2 adjtime.2 bind.2 brk.2 chdir.2 \
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madvise.2 mincore.2 minherit.2 mlock.2 mlockall.2 mmap.2 modctl.2 \
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mount.2 \
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mprotect.2 mremap.2 msgctl.2 msgget.2 msgrcv.2 msgsnd.2 msync.2 \
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munmap.2 nanosleep.2 nfssvc.2 ntp_adjtime.2 open.2 pathconf.2 pipe.2 \
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pmc_control.2 poll.2 posix_fadvise.2 profil.2 ptrace.2 __quotactl.2 \
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munmap.2 nanosleep.2 nfssvc.2 ntp_adjtime.2 open.2 pathconf.2 pipe.2
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.else
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MAN+= pipe.2
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.endif # !defined(__MINIX)
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.if !defined(__MINIX)
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MAN+= pmc_control.2 poll.2 posix_fadvise.2 profil.2 ptrace.2 __quotactl.2 \
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rasctl.2 read.2 readlink.2 \
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reboot.2 recv.2 rename.2 revoke.2 rmdir.2 \
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select.2 semctl.2 \
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@ -325,6 +334,10 @@ MLINKS+=utimes.2 futimes.2 utimes.2 lutimes.2
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MLINKS+=utimes.2 futimens.2 utimes.2 utimensat.2
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MLINKS+=wait.2 wait3.2 wait.2 wait4.2 wait.2 waitpid.2
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MLINKS+=write.2 writev.2 write.2 pwrite.2 write.2 pwritev.2
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.else
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MLINKS+=pipe.2 pipe2.2
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.endif # !defined(__MINIX)
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.if !defined(__MINIX)
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MLINKS+=accept.2 paccept.2
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MLINKS+=nanosleep.2 clock_nanosleep.2
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.endif # !defined(__MINIX)
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@ -3,7 +3,7 @@ MAN= accept.2 access.2 alarm.2 bind.2 brk.2 chdir.2 chmod.2 chown.2 \
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fork.2 getgid.2 getitimer.2 getnucred.2 getpeereid.2 \
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getpeername.2 getpid.2 getpriority.2 getsockname.2 getsockopt.2 \
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gettimeofday.2 getuid.2 intro.2 ioctl.2 kill.2 link.2 listen.2 \
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lseek.2 mkdir.2 mknod.2 mount.2 open.2 pause.2 pipe.2 ptrace.2 \
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lseek.2 mkdir.2 mknod.2 mount.2 open.2 pause.2 ptrace.2 \
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read.2 readlink.2 reboot.2 recv.2 recvfrom.2 recvmsg.2 rename.2 \
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rmdir.2 select.2 send.2 sendmsg.2 sendto.2 setsid.2 \
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setsockopt.2 setuid.2 shutdown.2 sigaction.2 sigpending.2 \
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@ -1,89 +0,0 @@
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.\" Copyright (c) 1980 Regents of the University of California.
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.\" All rights reserved. The Berkeley software License Agreement
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.\" specifies the terms and conditions for redistribution.
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.\"
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.\" @(#)pipe.2 6.2 (Berkeley) 8/26/85
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.\"
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.TH PIPE 2 "August 26, 1985"
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.UC 4
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.SH NAME
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pipe \- create an interprocess communication channel
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.SH SYNOPSIS
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.nf
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.ft B
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#include <unistd.h>
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int pipe(int \fIfildes\fP[2])
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.fi
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.ft R
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.SH DESCRIPTION
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The
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.B pipe
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system call
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creates an I/O mechanism called a pipe.
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The file descriptors returned can
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be used in read and write operations.
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When the pipe is written using the descriptor
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.IR fildes [1]
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up to PIPE_MAX bytes of data are buffered
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before the writing process is suspended.
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A read using the descriptor
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.IR fildes [0]
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will pick up the data.
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.PP
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PIPE_MAX equals 7168 under MINIX 3, but note that most systems use 4096.
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.PP
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It is assumed that after the
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pipe has been set up,
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two (or more)
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cooperating processes
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(created by subsequent
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.B fork
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calls)
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will pass data through the
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pipe with
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.B read
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and
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.B write
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calls.
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.PP
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The shell has a syntax
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to set up a linear array of processes
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connected by pipes.
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.PP
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Read calls on an empty
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pipe (no buffered data) with only one end
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(all write file descriptors closed)
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returns an end-of-file.
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.PP
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The signal SIGPIPE is generated if a write on a pipe with only one end
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is attempted.
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.SH "RETURN VALUE
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The function value zero is returned if the
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pipe was created; \-1 if an error occurred.
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.SH ERRORS
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The \fBpipe\fP call will fail if:
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.TP 15
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[EMFILE]
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Too many descriptors are active.
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.TP 15
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[ENFILE]
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The system file table is full.
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.TP 15
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[ENOSPC]
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The pipe file system (usually the root file system) has no free inodes.
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.TP 15
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[EFAULT]
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The \fIfildes\fP buffer is in an invalid area of the process's address
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space.
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.SH "SEE ALSO"
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.BR sh (1),
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.BR read (2),
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.BR write (2),
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.BR fork (2).
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.SH NOTES
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Writes may return ENOSPC errors if no pipe data can be buffered, because
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the pipe file system is full.
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.SH BUGS
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Should more than PIPE_MAX bytes be necessary in any
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pipe among a loop of processes, deadlock will occur.
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@ -538,7 +538,7 @@ the filp, the vnode remains locked, the soft lock is removed, and the filp
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mutex is released. Note that this scheme does not violate the locking order;
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the vnode is (already) locked before the filp.
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A similar problem arises with do_pipe. In this case we obtain a new vnode
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A similar problem arises with create_pipe. In this case we obtain a new vnode
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object, lock it, and obtain two new, locked, filp objects. If everything works
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out and the filp objects are linked to the same vnode, we run into trouble
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when unlocking both filps. The first filp being unlocked would work; the
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@ -31,6 +31,7 @@
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#define offset_high m2_l2
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#define ctl_req m4_l1
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#define mount_flags m1_i3
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#define pipe_flags m1_i3
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#define request m1_i2
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#define sig m1_i2
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#define endpt1 m1_i1
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@ -34,18 +34,55 @@
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#include "vnode.h"
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#include "vmnt.h"
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static int create_pipe(int fil_des[2], int flags);
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/*===========================================================================*
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* do_pipe *
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*===========================================================================*/
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int do_pipe()
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{
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/* Perform the pipe(fil_des) system call. */
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/* Perform the pipe(fil_des[2]) system call. */
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int r;
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int fil_des[2]; /* reply goes here */
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r = create_pipe(fil_des, 0 /* no flags */);
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if (r == OK) {
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m_out.reply_i1 = fil_des[0];
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m_out.reply_i2 = fil_des[1];
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}
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return r;
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}
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/*===========================================================================*
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* do_pipe2 *
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*===========================================================================*/
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int do_pipe2()
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{
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/* Perform the pipe2(fil_des[2], flags) system call. */
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int r, flags;
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int fil_des[2]; /* reply goes here */
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flags = job_m_in.pipe_flags;
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r = create_pipe(fil_des, flags);
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if (r == OK) {
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m_out.reply_i1 = fil_des[0];
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m_out.reply_i2 = fil_des[1];
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}
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return r;
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}
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/*===========================================================================*
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* create_pipe *
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*===========================================================================*/
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static int create_pipe(int fil_des[2], int flags)
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{
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register struct fproc *rfp;
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int r;
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struct filp *fil_ptr0, *fil_ptr1;
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int fil_des[2]; /* reply goes here */
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struct vnode *vp;
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struct vmnt *vmp;
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struct node_details res;
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@ -119,11 +156,12 @@ int do_pipe()
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fil_ptr0->filp_vno = vp;
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dup_vnode(vp);
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fil_ptr1->filp_vno = vp;
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fil_ptr0->filp_flags = O_RDONLY;
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fil_ptr1->filp_flags = O_WRONLY;
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m_out.reply_i1 = fil_des[0];
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m_out.reply_i2 = fil_des[1];
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fil_ptr0->filp_flags = O_RDONLY | (flags & ~O_ACCMODE);
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fil_ptr1->filp_flags = O_WRONLY | (flags & ~O_ACCMODE);
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if (flags & O_CLOEXEC) {
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FD_SET(fil_des[0], &rfp->fp_cloexec_set);
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FD_SET(fil_des[1], &rfp->fp_cloexec_set);
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}
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unlock_filps(fil_ptr0, fil_ptr1);
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unlock_vmnt(vmp);
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@ -184,6 +184,7 @@ int do_check_perms(void);
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/* pipe.c */
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int do_pipe(void);
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int do_pipe2(void);
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int map_vnode(struct vnode *vp, endpoint_t fs_e);
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void unpause(endpoint_t proc_e);
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int pipe_check(struct filp *filp, int rw_flag, int oflags, int bytes,
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@ -73,7 +73,7 @@ int (*call_vec[])(void) = {
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do_fcntl, /* 55 = fcntl */
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no_sys, /* 56 = (mpx) */
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do_fsready, /* 57 = FS proc ready */
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no_sys, /* 58 = unused */
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do_pipe2, /* 58 = pipe2 */
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no_sys, /* 59 = (execve)*/
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do_umask, /* 60 = umask */
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do_chroot, /* 61 = chroot */
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