| read.2 (50476) | read.2 (57686) |
|---|---|
| 1.\" Copyright (c) 1980, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 16 unchanged lines hidden (view full) --- 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)read.2 8.4 (Berkeley) 2/26/94 | 1.\" Copyright (c) 1980, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 16 unchanged lines hidden (view full) --- 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)read.2 8.4 (Berkeley) 2/26/94 |
| 33.\" $FreeBSD: head/lib/libc/sys/read.2 50476 1999-08-28 00:22:10Z peter $ | 33.\" $FreeBSD: head/lib/libc/sys/read.2 57686 2000-03-02 09:14:21Z sheldonh $ |
| 34.\" 35.Dd February 26, 1994 36.Dt READ 2 37.Os BSD 4 38.Sh NAME 39.Nm read , 40.Nm readv , 41.Nm pread --- 88 unchanged lines hidden (view full) --- 130and 131.Fn read 132is implemented as a function which locks 133.Va d 134for read, then calls 135.Fn _thread_sys_read . 136If the call to 137.Fn _thread_sys_read | 34.\" 35.Dd February 26, 1994 36.Dt READ 2 37.Os BSD 4 38.Sh NAME 39.Nm read , 40.Nm readv , 41.Nm pread --- 88 unchanged lines hidden (view full) --- 130and 131.Fn read 132is implemented as a function which locks 133.Va d 134for read, then calls 135.Fn _thread_sys_read . 136If the call to 137.Fn _thread_sys_read |
| 138would block, a context switch is performed. Before returning, | 138would block, a context switch is performed. 139Before returning, |
| 139.Fn read 140unlocks 141.Va d . 142.Pp 143In the non-threaded library 144.Fn readv 145is implemented as the 146.Va readv --- 6 unchanged lines hidden (view full) --- 153and 154.Fn readv 155is implemented as a function which locks 156.Va d 157for read, then calls 158.Fn _thread_sys_readv . 159If the call to 160.Fn _thread_sys_readv | 140.Fn read 141unlocks 142.Va d . 143.Pp 144In the non-threaded library 145.Fn readv 146is implemented as the 147.Va readv --- 6 unchanged lines hidden (view full) --- 154and 155.Fn readv 156is implemented as a function which locks 157.Va d 158for read, then calls 159.Fn _thread_sys_readv . 160If the call to 161.Fn _thread_sys_readv |
| 161would block, a context switch is performed. Before returning, | 162would block, a context switch is performed. 163Before returning, |
| 162.Fn readv 163unlocks 164.Va d . 165.Sh RETURN VALUES 166If successful, the | 164.Fn readv 165unlocks 166.Va d . 167.Sh RETURN VALUES 168If successful, the |
| 167number of bytes actually read is returned. Upon reading end-of-file, | 169number of bytes actually read is returned. 170Upon reading end-of-file, |
| 168zero is returned. 169Otherwise, a -1 is returned and the global variable 170.Va errno 171is set to indicate the error. 172.Sh ERRORS 173.Fn Read , 174.Fn readv , 175and --- 91 unchanged lines hidden --- | 171zero is returned. 172Otherwise, a -1 is returned and the global variable 173.Va errno 174is set to indicate the error. 175.Sh ERRORS 176.Fn Read , 177.Fn readv , 178and --- 91 unchanged lines hidden --- |