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1 | .\" Copyright (C) 2001 Andries Brouwer <aeb@cwi.nl>. |
2 | .\" | |
93015253 | 3 | .\" %%%LICENSE_START(VERBATIM) |
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4 | .\" Permission is granted to make and distribute verbatim copies of this |
5 | .\" manual provided the copyright notice and this permission notice are | |
6 | .\" preserved on all copies. | |
7 | .\" | |
8 | .\" Permission is granted to copy and distribute modified versions of this | |
9 | .\" manual under the conditions for verbatim copying, provided that the | |
10 | .\" entire resulting derived work is distributed under the terms of a | |
11 | .\" permission notice identical to this one. | |
c13182ef | 12 | .\" |
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13 | .\" Since the Linux kernel and libraries are constantly changing, this |
14 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
15 | .\" responsibility for errors or omissions, or for damages resulting from | |
16 | .\" the use of the information contained herein. The author(s) may not | |
17 | .\" have taken the same level of care in the production of this manual, | |
18 | .\" which is licensed free of charge, as they might when working | |
19 | .\" professionally. | |
c13182ef | 20 | .\" |
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21 | .\" Formatted or processed versions of this manual, if unaccompanied by |
22 | .\" the source, must acknowledge the copyright and authors of this work. | |
4b72fb64 | 23 | .\" %%%LICENSE_END |
fea681da | 24 | .\" |
4b8c67d9 | 25 | .TH FPURGE 3 2017-09-15 "" "Linux Programmer's Manual" |
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26 | .SH NAME |
27 | fpurge, __fpurge \- purge a stream | |
28 | .SH SYNOPSIS | |
29 | .nf | |
30 | /* unsupported */ | |
31 | .B #include <stdio.h> | |
68e4db0a | 32 | .PP |
fea681da | 33 | .BI "int fpurge(FILE *" stream ); |
f90f031e | 34 | |
fea681da MK |
35 | /* supported */ |
36 | .B #include <stdio.h> | |
fea681da | 37 | .B #include <stdio_ext.h> |
68e4db0a | 38 | .PP |
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39 | .BI "void __fpurge(FILE *" stream ); |
40 | .fi | |
41 | .SH DESCRIPTION | |
42 | The function | |
63aa9df0 | 43 | .BR fpurge () |
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44 | clears the buffers of the given stream. |
45 | For output streams this discards any unwritten output. | |
46 | For input streams this discards any input read from the underlying object | |
47 | but not yet obtained via | |
48 | .BR getc (3); | |
7c93fec0 MK |
49 | this includes any text pushed back via |
50 | .BR ungetc (3). | |
51 | See also | |
fea681da | 52 | .BR fflush (3). |
dd3568a1 | 53 | .PP |
fea681da | 54 | The function |
63aa9df0 | 55 | .BR __fpurge () |
fea681da | 56 | does precisely the same, but without returning a value. |
47297adb | 57 | .SH RETURN VALUE |
fea681da | 58 | Upon successful completion |
63aa9df0 | 59 | .BR fpurge () |
fea681da MK |
60 | returns 0. |
61 | On error, it returns \-1 and sets | |
62 | .I errno | |
63 | appropriately. | |
64 | .SH ERRORS | |
65 | .TP | |
66 | .B EBADF | |
67 | .I stream | |
68 | is not an open stream. | |
5b53f4ba ZL |
69 | .SH ATTRIBUTES |
70 | For an explanation of the terms used in this section, see | |
71 | .BR attributes (7). | |
72 | .TS | |
73 | allbox; | |
74 | lb lb lb | |
75 | l l l. | |
76 | Interface Attribute Value | |
77 | T{ | |
78 | .BR __fpurge () | |
79 | T} Thread safety MT-Safe race:stream | |
80 | .TE | |
847e0d88 | 81 | .sp 1 |
47297adb | 82 | .SH CONFORMING TO |
c8f2dd47 | 83 | These functions are nonstandard and not portable. |
fea681da | 84 | The function |
31e9a9ec | 85 | .BR fpurge () |
b14d4aa5 | 86 | was introduced in 4.4BSD and is not available under Linux. |
fea681da | 87 | The function |
31e9a9ec | 88 | .BR __fpurge () |
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89 | was introduced in Solaris, and is present in glibc 2.1.95 and later. |
90 | .SH NOTES | |
91 | Usually it is a mistake to want to discard input buffers. | |
47297adb | 92 | .SH SEE ALSO |
d49cc602 | 93 | .\" .BR fclean (3), |
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94 | .BR fflush (3), |
95 | .BR setbuf (3), | |
96 | .BR stdio_ext (3) |