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| author | rsc <devnull@localhost> | 2005-01-14 03:45:44 +0000 |
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| committer | rsc <devnull@localhost> | 2005-01-14 03:45:44 +0000 |
| commit | 78e51a8c6678b6e3dff3d619aa786669f531f4bc (patch) | |
| tree | 015e00fde4fc837fd31b705e18d17dc913829388 /man/man3/read.html | |
| parent | 2634795b5f0053bc0ff08e5d7bbc0eda8efea061 (diff) | |
| download | plan9port-78e51a8c6678b6e3dff3d619aa786669f531f4bc.tar.gz plan9port-78e51a8c6678b6e3dff3d619aa786669f531f4bc.tar.bz2 plan9port-78e51a8c6678b6e3dff3d619aa786669f531f4bc.zip | |
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diff --git a/man/man3/read.html b/man/man3/read.html new file mode 100644 index 00000000..515c3f77 --- /dev/null +++ b/man/man3/read.html @@ -0,0 +1,109 @@ +<head> +<title>read(3) - Plan 9 from User Space</title> +<meta content="text/html; charset=utf-8" http-equiv=Content-Type> +</head> +<body bgcolor=#ffffff> +<table border=0 cellpadding=0 cellspacing=0 width=100%> +<tr height=10><td> +<tr><td width=20><td> +<tr><td width=20><td><b>READ(3)</b><td align=right><b>READ(3)</b> +<tr><td width=20><td colspan=2> + <br> +<p><font size=+1><b>NAME </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + read, readn, write, pread, pwrite – read or write file<br> + +</table> +<p><font size=+1><b>SYNOPSIS </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + <tt><font size=+1>#include <u.h><br> + #include <libc.h> + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>long read(int fd, void *buf, long nbytes) + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>long readn(int fd, void *buf, long nbytes) + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>long write(int fd, void *buf, long nbytes) + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>long pread(int fd, void *buf, long nbytes, vlong offset) + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>long pwrite(int fd, void *buf, long nbytes, vlong offset)<br> + </font></tt> +</table> +<p><font size=+1><b>DESCRIPTION </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + <i>Read</i> reads <i>nbytes</i> bytes of data from the offset in the file associated + with <i>fd</i> into memory at <i>buf</i>. The offset is advanced by the number + of bytes read. It is not guaranteed that all <i>nbytes</i> bytes will + be read; for example if the file refers to the console, at most + one line will be returned. In any event the number of bytes + read is returned. A return value of 0 is conventionally interpreted + as end of file. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + <i>Readn</i> is just like read, but does successive <i>read</i> calls until + <i>nbytes</i> have been read, or a read system call returns a non-positive + count. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + <i>Write</i> writes <i>nbytes</i> bytes of data starting at <i>buf</i> to the file + associated with <i>fd</i> at the file offset. The offset is advanced + by the number of bytes written. The number of characters actually + written is returned. It should be regarded as an error if this + is not the same as requested. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + <i>Pread</i> and <i>Pwrite</i> equivalent to a <a href="../man3/seek.html"><i>seek</i>(3)</a> to <i>offset</i> followed by + a <i>read</i> or <i>write</i>. By combining the operations in a single atomic + call, they more closely match the 9P protocol (see <i>intro</i>(9p)) + and, more important, permit multiprocess programs to execute multiple + concurrent read and write operations on the same file + descriptor without interference.<br> + +</table> +<p><font size=+1><b>SOURCE </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + <tt><font size=+1>/usr/local/plan9/src/lib9/readn.c<br> + </font></tt> +</table> +<p><font size=+1><b>SEE ALSO </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + <a href="../man3/intro.html"><i>intro</i>(3)</a>, <a href="../man3/open.html"><i>open</i>(3)</a>, <a href="../man3/dup.html"><i>dup</i>(3)</a>, <a href="../man3/pipe.html"><i>pipe</i>(3)</a><br> + +</table> +<p><font size=+1><b>DIAGNOSTICS </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + These functions set <i>errstr</i>.<br> + +</table> + +<td width=20> +<tr height=20><td> +</table> +<!-- TRAILER --> +<table border=0 cellpadding=0 cellspacing=0 width=100%> +<tr height=15><td width=10><td><td width=10> +<tr><td><td> +<center> +<a href="../../"><img src="../../dist/spaceglenda100.png" alt="Space Glenda" border=1></a> +</center> +</table> +<!-- TRAILER --> +</body></html> |