Try to fix SIGIO problem with Sun machines, h_errno with

[unix-history] / usr / src / lib / libc / sys / read.2

diff --git a/usr/src/lib/libc/sys/read.2 b/usr/src/lib/libc/sys/read.2
index ee458bc..35dee7f 100644 (file)
--- a/usr/src/lib/libc/sys/read.2
+++ b/usr/src/lib/libc/sys/read.2
@@ -2,9 +2,9 @@
 .\" All rights reserved.  The Berkeley software License Agreement
 .\" specifies the terms and conditions for redistribution.
 .\"
 .\" All rights reserved.  The Berkeley software License Agreement
 .\" specifies the terms and conditions for redistribution.
 .\"

-.\"    @(#)read.2      5.1 (Berkeley) %G%
+.\"    @(#)read.2      6.6 (Berkeley) %G%

 .\"
 .\"

-.TH READ 2 "27 July 1983"
+.TH READ 2 ""

 .UC 4
 .SH NAME
 read, readv \- read input
 .UC 4
 .SH NAME
 read, readv \- read input


@@ -39,7 +39,7 @@ performs the same action, but scatters the input data
 into the 
 .I iovcnt
 buffers specified by the members of the
 into the 
 .I iovcnt
 buffers specified by the members of the

-.I iovec
+.I iov

 array: iov[0], iov[1], ..., iov[iovcnt\|\-\|1].
 .PP
 For 
 array: iov[0], iov[1], ..., iov[iovcnt\|\-\|1].
 .PP
 For 


@@ -70,15 +70,15 @@ On objects capable of seeking, the
 .I read
 starts at a position
 given by the pointer associated with
 .I read
 starts at a position
 given by the pointer associated with

-.IR d ,
-see
-.IR lseek (2).
+.IR d 
+(see
+.IR lseek (2)).

 Upon return from
 .IR read ,
 the pointer is incremented by the number of bytes actually read.
 .PP
 Objects that are not capable of seeking always read from the current
 Upon return from
 .IR read ,
 the pointer is incremented by the number of bytes actually read.
 .PP
 Objects that are not capable of seeking always read from the current

-position.  The value of the pointer associated with such a 
+position.  The value of the pointer associated with such an

 object is undefined.
 .PP
 Upon successful completion,
 object is undefined.
 .PP
 Upon successful completion,


@@ -87,8 +87,8 @@ and
 .I readv
 return the number of bytes actually read and placed in the buffer.
 The system guarantees to read the number of bytes requested if
 .I readv
 return the number of bytes actually read and placed in the buffer.
 The system guarantees to read the number of bytes requested if

-the descriptor references a file which has that many bytes left
-before the end-of-file, but in no other cases.
+the descriptor references a normal file that has that many bytes left
+before the end-of-file, but in no other case.

 .PP
 If the returned value is 0, then
 end-of-file has been reached.
 .PP
 If the returned value is 0, then
 end-of-file has been reached.


@@ -105,14 +105,26 @@ and
 will fail if one or more of the following are true:
 .TP 15
 [EBADF]
 will fail if one or more of the following are true:
 .TP 15
 [EBADF]

-\fIFildes\fP is not a valid file descriptor open for reading.
+\fID\fP is not a valid file or socket descriptor open for reading.

 .TP 15
 [EFAULT]
 \fIBuf\fP points outside the allocated address space.
 .TP 15
 .TP 15
 [EFAULT]
 \fIBuf\fP points outside the allocated address space.
 .TP 15

+[EIO]
+An I/O error occurred while reading from the file system.
+.TP 15

 [EINTR]
 A read from a slow device was interrupted before
 any data arrived by the delivery of a signal.
 [EINTR]
 A read from a slow device was interrupted before
 any data arrived by the delivery of a signal.

+.TP 15
+[EINVAL]
+The pointer associated with
+.I d
+was negative.
+.TP 15
+[EWOULDBLOCK]
+The file was marked for non-blocking I/O,
+and no data were ready to be read.

 .PP
 In addition, 
 .I readv
 .PP
 In addition, 
 .I readv


@@ -135,5 +147,8 @@ The sum of the
 values in the
 .I iov
 array overflowed a 32-bit integer.
 values in the
 .I iov
 array overflowed a 32-bit integer.

+.TP 15
+[EFAULT]
+Part of the \fIiov\fP points outside the process's allocated address space.

 .SH "SEE ALSO"
 .SH "SEE ALSO"

-dup(2), open(2), pipe(2), socket(2), socketpair(2)
+dup(2), fcntl(2), open(2), pipe(2), select(2), socket(2), socketpair(2)