X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=sys%2Fman%2F2%2Fbio;h=b62a5877dc7c4b3f02860a1eac1f470bfadcb7c0;hb=4c9cbe484d8bbade0a44ba1d26044077cae44fee;hp=1aae56005655d1e061caac07c427b93a4c81c175;hpb=035aacf6f5c23f0513e240046818ef203e8d87cb;p=plan9front.git

diff --git a/sys/man/2/bio b/sys/man/2/bio
index 1aae56005..b62a5877d 100644
--- a/sys/man/2/bio
+++ b/sys/man/2/bio
@@ -84,6 +84,9 @@ int	Bbuffered(Biobufhdr *bp)
 .B
 void	Blethal(Biobufhdr *bp, void (*errorf)(char *))
 .PP
+.B
+void	Biofn(Biobufhdr *bp, int (*iof)(Biobufhdr *, void *, long))
+.PP
 .SH DESCRIPTION
 These routines implement fast buffered I/O.
 I/O on different file descriptors is independent.
@@ -150,12 +153,14 @@ returns the integer file descriptor of the associated open file.
 .PP
 .I Bterm
 flushes the buffer for
-.IR bp
+.I bp
 and returns
 .IR Bflush 's
 return value.
 If the buffer was allocated by
-.IR Bopen ,
+.I Bopen
+or
+.IR Bfdopen ,
 the buffer is
 .I freed
 and the file is closed.
@@ -265,7 +270,7 @@ outputs the low order 8 bits of
 on
 .IR bp .
 If this causes a
-.IR write
+.I write
 to occur and there is an error,
 a negative value is returned.
 Otherwise, a zero is returned.
@@ -286,7 +291,7 @@ on the output stream.
 is a buffered interface to
 .IR print (2).
 If this causes a
-.IR write
+.I write
 to occur and there is an error,
 a negative value
 .RB ( Beof )
@@ -307,7 +312,7 @@ of data starting at
 to
 .IR bp .
 If this causes a
-.IR write
+.I write
 to occur and there is an error,
 a negative value is returned.
 Otherwise, the number of bytes written is returned.
@@ -336,10 +341,23 @@ to be called in case of an error happening on read/write.
 An argument of
 .B nil
 will have the program terminated in case of error.
+.PP
+If
+.I Biofn
+is called with a non-nil
+.I iof
+function, then that function is called for I/O in lieu of
+.IR read (2)
+and
+.IR write .
+A nil argument for
+.I iof
+restores normal behaviour.
 .SH SOURCE
 .B /sys/src/libbio
 .SH SEE ALSO
 .IR open (2),
+.IR read (2),
 .IR print (2),
 .IR exits (2),
 .IR utf (6),