| setbuf.3 (58d38e25205c6ee5ef0796ffa2cd8e2ca6c6e7f3) | setbuf.3 (ae828962685b8ae9e5104ce8e7fe8b05effcb9ec) |
|---|---|
| 1.\" Copyright (c) 1980, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the American National Standards Committee X3, on Information 6.\" Processing Systems. 7.\" 8.\" Redistribution and use in source and binary forms, with or without --- 51 unchanged lines hidden (view full) --- 60.Sh DESCRIPTION 61The three types of buffering available are unbuffered, block buffered, 62and line buffered. 63When an output stream is unbuffered, information appears on the 64destination file or terminal as soon as written; 65when it is block buffered many characters are saved up and written as a block; 66when it is line buffered characters are saved up until a newline is 67output or input is read from any stream attached to a terminal device | 1.\" Copyright (c) 1980, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the American National Standards Committee X3, on Information 6.\" Processing Systems. 7.\" 8.\" Redistribution and use in source and binary forms, with or without --- 51 unchanged lines hidden (view full) --- 60.Sh DESCRIPTION 61The three types of buffering available are unbuffered, block buffered, 62and line buffered. 63When an output stream is unbuffered, information appears on the 64destination file or terminal as soon as written; 65when it is block buffered many characters are saved up and written as a block; 66when it is line buffered characters are saved up until a newline is 67output or input is read from any stream attached to a terminal device |
| 68(typically stdin). | 68(typically 69.Dv stdin ) . |
| 69The function 70.Xr fflush 3 71may be used to force the block out early. 72(See 73.Xr fclose 3 . ) 74.Pp 75Normally all files are block buffered. 76When the first 77.Tn I/O 78operation occurs on a file, 79.Xr malloc 3 80is called, 81and an optimally-sized buffer is obtained. 82If a stream refers to a terminal 83(as | 70The function 71.Xr fflush 3 72may be used to force the block out early. 73(See 74.Xr fclose 3 . ) 75.Pp 76Normally all files are block buffered. 77When the first 78.Tn I/O 79operation occurs on a file, 80.Xr malloc 3 81is called, 82and an optimally-sized buffer is obtained. 83If a stream refers to a terminal 84(as |
| 84.Em stdout | 85.Dv stdout |
| 85normally does) it is line buffered. 86The standard error stream | 86normally does) it is line buffered. 87The standard error stream |
| 87.Em stderr | 88.Dv stderr |
| 88is always unbuffered. 89.Pp 90The 91.Fn setvbuf 92function 93may be used to alter the buffering behavior of a stream. 94The 95.Fa mode --- 110 unchanged lines hidden --- | 89is always unbuffered. 90.Pp 91The 92.Fn setvbuf 93function 94may be used to alter the buffering behavior of a stream. 95The 96.Fa mode --- 110 unchanged lines hidden --- |