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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/dirread.html | |
| parent | 2634795b5f0053bc0ff08e5d7bbc0eda8efea061 (diff) | |
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diff --git a/man/man3/dirread.html b/man/man3/dirread.html new file mode 100644 index 00000000..7c5ba4ed --- /dev/null +++ b/man/man3/dirread.html @@ -0,0 +1,114 @@ +<head> +<title>dirread(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>DIRREAD(3)</b><td align=right><b>DIRREAD(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> + + dirread, dirreadall – read directory<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 dirread(int fd, Dir **buf) + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>long dirreadall(int fd, Dir **buf) + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>#define STATMAX 65535U + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>#define DIRMAX (sizeof(Dir)+STATMAX)<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> + + The data returned by a <a href="../man3/read.html"><i>read</i>(3)</a> on a directory is a set of complete + directory entries in a machine-independent format, exactly equivalent + to the result of a <a href="../man3/stat.html"><i>stat</i>(3)</a> on each file or subdirectory in the + directory. <i>Dirread</i> decodes the directory entries into a machine-dependent + form. It reads from <i>fd</i> and unpacks the data + into an array of <tt><font size=+1>Dir</font></tt> structures whose address is returned in <tt><font size=+1>*buf</font></tt> + (see <a href="../man3/stat.html"><i>stat</i>(3)</a> for the layout of a <tt><font size=+1>Dir</font></tt>). The array is allocated + with <a href="../man3/malloc.html"><i>malloc</i>(3)</a> each time <i>dirread</i> is called. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + <i>Dirreadall</i> is like <i>dirread</i>, but reads in the entire directory; + by contrast, <i>dirread</i> steps through a directory one <a href="../man3/read.html"><i>read</i>(3)</a> at + a time. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + Directory entries have variable length. A successful <i>read</i> of a + directory always returns an integral number of complete directory + entries; <i>dirread</i> always returns complete <tt><font size=+1>Dir</font></tt> structures. See <i>read</i>(9p) + for more information. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + The constant <tt><font size=+1>STATMAX</font></tt> is the maximum size that a directory entry + can occupy. The constant <tt><font size=+1>DIRMAX</font></tt> is an upper limit on the size + necessary to hold a <tt><font size=+1>Dir</font></tt> structure and all the associated data. + + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + <i>Dirread</i> and <i>dirreadall</i> return the number of <tt><font size=+1>Dir</font></tt> structures filled + in <tt><font size=+1>buf</font></tt>. The file offset is advanced by the number of bytes actually + read.<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/dirread.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/read.html"><i>read</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> + + <i>Dirread</i> and <i>Dirreadall</i> return zero for end of file and a negative + value for error. In either case, <tt><font size=+1>*buf</font></tt> is set to <tt><font size=+1>nil</font></tt> so the pointer + can always be freed with impunity. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + 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> |