1.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.37
| 1.\" Automatically generated by Pod::Man 2.22 (Pod::Simple 3.07)
|
2.\"
3.\" Standard preamble:
4.\" ========================================================================
| 2.\"
3.\" Standard preamble:
4.\" ========================================================================
|
5.de Sh \" Subsection heading
6.br
7.if t .Sp
8.ne 5
9.PP
10\fB\\$1\fR
11.PP
12..
| |
13.de Sp \" Vertical space (when we can't use .PP)
14.if t .sp .5v
15.if n .sp
16..
17.de Vb \" Begin verbatim text
18.ft CW
19.nf
20.ne \\$1
21..
22.de Ve \" End verbatim text
23.ft R
24.fi
25..
26.\" Set up some character translations and predefined strings. \*(-- will
27.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
| 5.de Sp \" Vertical space (when we can't use .PP)
6.if t .sp .5v
7.if n .sp
8..
9.de Vb \" Begin verbatim text
10.ft CW
11.nf
12.ne \\$1
13..
14.de Ve \" End verbatim text
15.ft R
16.fi
17..
18.\" Set up some character translations and predefined strings. \*(-- will
19.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
|
28.\" double quote, and \*(R" will give a right double quote. | will give a
29.\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used to
30.\" do unbreakable dashes and therefore won't be available. \*(C` and \*(C'
31.\" expand to `' in nroff, nothing in troff, for use with C<>.
32.tr \(*W-|\(bv\*(Tr
| 20.\" double quote, and \*(R" will give a right double quote. \*(C+ will
21.\" give a nicer C++. Capital omega is used to do unbreakable dashes and
22.\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff,
23.\" nothing in troff, for use with C<>.
24.tr \(*W-
|
33.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
34.ie n \{\
35. ds -- \(*W-
36. ds PI pi
37. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
38. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
39. ds L" ""
40. ds R" ""
41. ds C` ""
42. ds C' ""
43'br\}
44.el\{\
45. ds -- \|\(em\|
46. ds PI \(*p
47. ds L" ``
48. ds R" ''
49'br\}
50.\"
| 25.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
26.ie n \{\
27. ds -- \(*W-
28. ds PI pi
29. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
30. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
31. ds L" ""
32. ds R" ""
33. ds C` ""
34. ds C' ""
35'br\}
36.el\{\
37. ds -- \|\(em\|
38. ds PI \(*p
39. ds L" ``
40. ds R" ''
41'br\}
42.\"
|
| 43.\" Escape single quotes in literal strings from groff's Unicode transform.
44.ie \n(.g .ds Aq \(aq
45.el .ds Aq '
46.\"
|
51.\" If the F register is turned on, we'll generate index entries on stderr for
| 47.\" If the F register is turned on, we'll generate index entries on stderr for
|
52.\" titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and index
| 48.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
|
53.\" entries marked with X<> in POD. Of course, you'll have to process the
54.\" output yourself in some meaningful fashion.
| 49.\" entries marked with X<> in POD. Of course, you'll have to process the
50.\" output yourself in some meaningful fashion.
|
55.if \nF \{\
| 51.ie \nF \{\
|
56. de IX
57. tm Index:\\$1\t\\n%\t"\\$2"
58..
59. nr % 0
60. rr F
61.\}
| 52. de IX
53. tm Index:\\$1\t\\n%\t"\\$2"
54..
55. nr % 0
56. rr F
57.\}
|
| 58.el \{\
59. de IX
60..
61.\}
|
62.\"
| 62.\"
|
63.\" For nroff, turn off justification. Always turn off hyphenation; it makes
64.\" way too many mistakes in technical documents.
65.hy 0
66.if n .na
67.\"
| |
68.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
69.\" Fear. Run. Save yourself. No user-serviceable parts.
70. \" fudge factors for nroff and troff
71.if n \{\
72. ds #H 0
73. ds #V .8m
74. ds #F .3m
75. ds #[ \f1
76. ds #] \fP
77.\}
78.if t \{\
79. ds #H ((1u-(\\\\n(.fu%2u))*.13m)
80. ds #V .6m
81. ds #F 0
82. ds #[ \&
83. ds #] \&
84.\}
85. \" simple accents for nroff and troff
86.if n \{\
87. ds ' \&
88. ds ` \&
89. ds ^ \&
90. ds , \&
91. ds ~ ~
92. ds /
93.\}
94.if t \{\
95. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
96. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
97. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
98. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
99. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
100. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
101.\}
102. \" troff and (daisy-wheel) nroff accents
103.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
104.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
105.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
106.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
107.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
108.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
109.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
110.ds ae a\h'-(\w'a'u*4/10)'e
111.ds Ae A\h'-(\w'A'u*4/10)'E
112. \" corrections for vroff
113.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
114.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
115. \" for low resolution devices (crt and lpr)
116.if \n(.H>23 .if \n(.V>19 \
117\{\
118. ds : e
119. ds 8 ss
120. ds o a
121. ds d- d\h'-1'\(ga
122. ds D- D\h'-1'\(hy
123. ds th \o'bp'
124. ds Th \o'LP'
125. ds ae ae
126. ds Ae AE
127.\}
128.rm #[ #] #H #V #F C
129.\" ========================================================================
130.\"
131.IX Title "BIO_s_file 3"
| 63.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
64.\" Fear. Run. Save yourself. No user-serviceable parts.
65. \" fudge factors for nroff and troff
66.if n \{\
67. ds #H 0
68. ds #V .8m
69. ds #F .3m
70. ds #[ \f1
71. ds #] \fP
72.\}
73.if t \{\
74. ds #H ((1u-(\\\\n(.fu%2u))*.13m)
75. ds #V .6m
76. ds #F 0
77. ds #[ \&
78. ds #] \&
79.\}
80. \" simple accents for nroff and troff
81.if n \{\
82. ds ' \&
83. ds ` \&
84. ds ^ \&
85. ds , \&
86. ds ~ ~
87. ds /
88.\}
89.if t \{\
90. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
91. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
92. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
93. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
94. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
95. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
96.\}
97. \" troff and (daisy-wheel) nroff accents
98.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
99.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
100.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
101.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
102.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
103.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
104.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
105.ds ae a\h'-(\w'a'u*4/10)'e
106.ds Ae A\h'-(\w'A'u*4/10)'E
107. \" corrections for vroff
108.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
109.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
110. \" for low resolution devices (crt and lpr)
111.if \n(.H>23 .if \n(.V>19 \
112\{\
113. ds : e
114. ds 8 ss
115. ds o a
116. ds d- d\h'-1'\(ga
117. ds D- D\h'-1'\(hy
118. ds th \o'bp'
119. ds Th \o'LP'
120. ds ae ae
121. ds Ae AE
122.\}
123.rm #[ #] #H #V #F C
124.\" ========================================================================
125.\"
126.IX Title "BIO_s_file 3"
|
132.TH BIO_s_file 3 "2010-03-24" "0.9.8n" "OpenSSL"
| 127.TH BIO_s_file 3 "2010-11-16" "0.9.8p" "OpenSSL"
128.\" For nroff, turn off justification. Always turn off hyphenation; it makes
129.\" way too many mistakes in technical documents.
130.if n .ad l
131.nh
|
133.SH "NAME"
134BIO_s_file, BIO_new_file, BIO_new_fp, BIO_set_fp, BIO_get_fp,
135BIO_read_filename, BIO_write_filename, BIO_append_filename,
136BIO_rw_filename \- FILE bio
137.SH "SYNOPSIS"
138.IX Header "SYNOPSIS"
139.Vb 1
140\& #include <openssl/bio.h>
| 132.SH "NAME"
133BIO_s_file, BIO_new_file, BIO_new_fp, BIO_set_fp, BIO_get_fp,
134BIO_read_filename, BIO_write_filename, BIO_append_filename,
135BIO_rw_filename \- FILE bio
136.SH "SYNOPSIS"
137.IX Header "SYNOPSIS"
138.Vb 1
139\& #include <openssl/bio.h>
|
141.Ve
142.PP
143.Vb 3
| 140\&
|
144\& BIO_METHOD * BIO_s_file(void);
145\& BIO *BIO_new_file(const char *filename, const char *mode);
146\& BIO *BIO_new_fp(FILE *stream, int flags);
| 141\& BIO_METHOD * BIO_s_file(void);
142\& BIO *BIO_new_file(const char *filename, const char *mode);
143\& BIO *BIO_new_fp(FILE *stream, int flags);
|
147.Ve
148.PP
149.Vb 2
| 144\&
|
150\& BIO_set_fp(BIO *b,FILE *fp, int flags);
151\& BIO_get_fp(BIO *b,FILE **fpp);
| 145\& BIO_set_fp(BIO *b,FILE *fp, int flags);
146\& BIO_get_fp(BIO *b,FILE **fpp);
|
152.Ve
153.PP
154.Vb 4
| 147\&
|
155\& int BIO_read_filename(BIO *b, char *name)
156\& int BIO_write_filename(BIO *b, char *name)
157\& int BIO_append_filename(BIO *b, char *name)
158\& int BIO_rw_filename(BIO *b, char *name)
159.Ve
160.SH "DESCRIPTION"
161.IX Header "DESCRIPTION"
162\&\fIBIO_s_file()\fR returns the \s-1BIO\s0 file method. As its name implies it
163is a wrapper round the stdio \s-1FILE\s0 structure and it is a
164source/sink \s-1BIO\s0.
165.PP
166Calls to \fIBIO_read()\fR and \fIBIO_write()\fR read and write data to the
167underlying stream. \fIBIO_gets()\fR and \fIBIO_puts()\fR are supported on file BIOs.
168.PP
169\&\fIBIO_flush()\fR on a file \s-1BIO\s0 calls the \fIfflush()\fR function on the wrapped
170stream.
171.PP
172\&\fIBIO_reset()\fR attempts to change the file pointer to the start of file
173using fseek(stream, 0, 0).
174.PP
175\&\fIBIO_seek()\fR sets the file pointer to position \fBofs\fR from start of file
176using fseek(stream, ofs, 0).
177.PP
178\&\fIBIO_eof()\fR calls \fIfeof()\fR.
179.PP
180Setting the \s-1BIO_CLOSE\s0 flag calls \fIfclose()\fR on the stream when the \s-1BIO\s0
181is freed.
182.PP
183\&\fIBIO_new_file()\fR creates a new file \s-1BIO\s0 with mode \fBmode\fR the meaning
184of \fBmode\fR is the same as the stdio function \fIfopen()\fR. The \s-1BIO_CLOSE\s0
185flag is set on the returned \s-1BIO\s0.
186.PP
187\&\fIBIO_new_fp()\fR creates a file \s-1BIO\s0 wrapping \fBstream\fR. Flags can be:
188\&\s-1BIO_CLOSE\s0, \s-1BIO_NOCLOSE\s0 (the close flag) \s-1BIO_FP_TEXT\s0 (sets the underlying
189stream to text mode, default is binary: this only has any effect under
190Win32).
191.PP
192\&\fIBIO_set_fp()\fR set the fp of a file \s-1BIO\s0 to \fBfp\fR. \fBflags\fR has the same
193meaning as in \fIBIO_new_fp()\fR, it is a macro.
194.PP
195\&\fIBIO_get_fp()\fR retrieves the fp of a file \s-1BIO\s0, it is a macro.
196.PP
197\&\fIBIO_seek()\fR is a macro that sets the position pointer to \fBoffset\fR bytes
198from the start of file.
199.PP
200\&\fIBIO_tell()\fR returns the value of the position pointer.
201.PP
202\&\fIBIO_read_filename()\fR, \fIBIO_write_filename()\fR, \fIBIO_append_filename()\fR and
203\&\fIBIO_rw_filename()\fR set the file \s-1BIO\s0 \fBb\fR to use file \fBname\fR for
204reading, writing, append or read write respectively.
205.SH "NOTES"
206.IX Header "NOTES"
207When wrapping stdout, stdin or stderr the underlying stream should not
208normally be closed so the \s-1BIO_NOCLOSE\s0 flag should be set.
209.PP
210Because the file \s-1BIO\s0 calls the underlying stdio functions any quirks
211in stdio behaviour will be mirrored by the corresponding \s-1BIO\s0.
212.SH "EXAMPLES"
213.IX Header "EXAMPLES"
214File \s-1BIO\s0 \*(L"hello world\*(R":
215.PP
216.Vb 3
217\& BIO *bio_out;
218\& bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
219\& BIO_printf(bio_out, "Hello World\en");
220.Ve
221.PP
222Alternative technique:
223.PP
224.Vb 5
225\& BIO *bio_out;
226\& bio_out = BIO_new(BIO_s_file());
227\& if(bio_out == NULL) /* Error ... */
228\& if(!BIO_set_fp(bio_out, stdout, BIO_NOCLOSE)) /* Error ... */
229\& BIO_printf(bio_out, "Hello World\en");
230.Ve
231.PP
232Write to a file:
233.PP
234.Vb 5
235\& BIO *out;
236\& out = BIO_new_file("filename.txt", "w");
237\& if(!out) /* Error occurred */
238\& BIO_printf(out, "Hello World\en");
239\& BIO_free(out);
240.Ve
241.PP
242Alternative technique:
243.PP
244.Vb 6
245\& BIO *out;
246\& out = BIO_new(BIO_s_file());
247\& if(out == NULL) /* Error ... */
248\& if(!BIO_write_filename(out, "filename.txt")) /* Error ... */
249\& BIO_printf(out, "Hello World\en");
250\& BIO_free(out);
251.Ve
252.SH "RETURN VALUES"
253.IX Header "RETURN VALUES"
254\&\fIBIO_s_file()\fR returns the file \s-1BIO\s0 method.
255.PP
256\&\fIBIO_new_file()\fR and \fIBIO_new_fp()\fR return a file \s-1BIO\s0 or \s-1NULL\s0 if an error
257occurred.
258.PP
259\&\fIBIO_set_fp()\fR and \fIBIO_get_fp()\fR return 1 for success or 0 for failure
260(although the current implementation never return 0).
261.PP
262\&\fIBIO_seek()\fR returns the same value as the underlying \fIfseek()\fR function:
2630 for success or \-1 for failure.
264.PP
265\&\fIBIO_tell()\fR returns the current file position.
266.PP
267\&\fIBIO_read_filename()\fR, \fIBIO_write_filename()\fR, \fIBIO_append_filename()\fR and
268\&\fIBIO_rw_filename()\fR return 1 for success or 0 for failure.
269.SH "BUGS"
270.IX Header "BUGS"
271\&\fIBIO_reset()\fR and \fIBIO_seek()\fR are implemented using \fIfseek()\fR on the underlying
272stream. The return value for \fIfseek()\fR is 0 for success or \-1 if an error
273occurred this differs from other types of \s-1BIO\s0 which will typically return
2741 for success and a non positive value if an error occurred.
275.SH "SEE ALSO"
276.IX Header "SEE ALSO"
277\&\fIBIO_seek\fR\|(3), \fIBIO_tell\fR\|(3),
278\&\fIBIO_reset\fR\|(3), \fIBIO_flush\fR\|(3),
279\&\fIBIO_read\fR\|(3),
280\&\fIBIO_write\fR\|(3), \fIBIO_puts\fR\|(3),
281\&\fIBIO_gets\fR\|(3), \fIBIO_printf\fR\|(3),
282\&\fIBIO_set_close\fR\|(3), \fIBIO_get_close\fR\|(3)
| 148\& int BIO_read_filename(BIO *b, char *name)
149\& int BIO_write_filename(BIO *b, char *name)
150\& int BIO_append_filename(BIO *b, char *name)
151\& int BIO_rw_filename(BIO *b, char *name)
152.Ve
153.SH "DESCRIPTION"
154.IX Header "DESCRIPTION"
155\&\fIBIO_s_file()\fR returns the \s-1BIO\s0 file method. As its name implies it
156is a wrapper round the stdio \s-1FILE\s0 structure and it is a
157source/sink \s-1BIO\s0.
158.PP
159Calls to \fIBIO_read()\fR and \fIBIO_write()\fR read and write data to the
160underlying stream. \fIBIO_gets()\fR and \fIBIO_puts()\fR are supported on file BIOs.
161.PP
162\&\fIBIO_flush()\fR on a file \s-1BIO\s0 calls the \fIfflush()\fR function on the wrapped
163stream.
164.PP
165\&\fIBIO_reset()\fR attempts to change the file pointer to the start of file
166using fseek(stream, 0, 0).
167.PP
168\&\fIBIO_seek()\fR sets the file pointer to position \fBofs\fR from start of file
169using fseek(stream, ofs, 0).
170.PP
171\&\fIBIO_eof()\fR calls \fIfeof()\fR.
172.PP
173Setting the \s-1BIO_CLOSE\s0 flag calls \fIfclose()\fR on the stream when the \s-1BIO\s0
174is freed.
175.PP
176\&\fIBIO_new_file()\fR creates a new file \s-1BIO\s0 with mode \fBmode\fR the meaning
177of \fBmode\fR is the same as the stdio function \fIfopen()\fR. The \s-1BIO_CLOSE\s0
178flag is set on the returned \s-1BIO\s0.
179.PP
180\&\fIBIO_new_fp()\fR creates a file \s-1BIO\s0 wrapping \fBstream\fR. Flags can be:
181\&\s-1BIO_CLOSE\s0, \s-1BIO_NOCLOSE\s0 (the close flag) \s-1BIO_FP_TEXT\s0 (sets the underlying
182stream to text mode, default is binary: this only has any effect under
183Win32).
184.PP
185\&\fIBIO_set_fp()\fR set the fp of a file \s-1BIO\s0 to \fBfp\fR. \fBflags\fR has the same
186meaning as in \fIBIO_new_fp()\fR, it is a macro.
187.PP
188\&\fIBIO_get_fp()\fR retrieves the fp of a file \s-1BIO\s0, it is a macro.
189.PP
190\&\fIBIO_seek()\fR is a macro that sets the position pointer to \fBoffset\fR bytes
191from the start of file.
192.PP
193\&\fIBIO_tell()\fR returns the value of the position pointer.
194.PP
195\&\fIBIO_read_filename()\fR, \fIBIO_write_filename()\fR, \fIBIO_append_filename()\fR and
196\&\fIBIO_rw_filename()\fR set the file \s-1BIO\s0 \fBb\fR to use file \fBname\fR for
197reading, writing, append or read write respectively.
198.SH "NOTES"
199.IX Header "NOTES"
200When wrapping stdout, stdin or stderr the underlying stream should not
201normally be closed so the \s-1BIO_NOCLOSE\s0 flag should be set.
202.PP
203Because the file \s-1BIO\s0 calls the underlying stdio functions any quirks
204in stdio behaviour will be mirrored by the corresponding \s-1BIO\s0.
205.SH "EXAMPLES"
206.IX Header "EXAMPLES"
207File \s-1BIO\s0 \*(L"hello world\*(R":
208.PP
209.Vb 3
210\& BIO *bio_out;
211\& bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
212\& BIO_printf(bio_out, "Hello World\en");
213.Ve
214.PP
215Alternative technique:
216.PP
217.Vb 5
218\& BIO *bio_out;
219\& bio_out = BIO_new(BIO_s_file());
220\& if(bio_out == NULL) /* Error ... */
221\& if(!BIO_set_fp(bio_out, stdout, BIO_NOCLOSE)) /* Error ... */
222\& BIO_printf(bio_out, "Hello World\en");
223.Ve
224.PP
225Write to a file:
226.PP
227.Vb 5
228\& BIO *out;
229\& out = BIO_new_file("filename.txt", "w");
230\& if(!out) /* Error occurred */
231\& BIO_printf(out, "Hello World\en");
232\& BIO_free(out);
233.Ve
234.PP
235Alternative technique:
236.PP
237.Vb 6
238\& BIO *out;
239\& out = BIO_new(BIO_s_file());
240\& if(out == NULL) /* Error ... */
241\& if(!BIO_write_filename(out, "filename.txt")) /* Error ... */
242\& BIO_printf(out, "Hello World\en");
243\& BIO_free(out);
244.Ve
245.SH "RETURN VALUES"
246.IX Header "RETURN VALUES"
247\&\fIBIO_s_file()\fR returns the file \s-1BIO\s0 method.
248.PP
249\&\fIBIO_new_file()\fR and \fIBIO_new_fp()\fR return a file \s-1BIO\s0 or \s-1NULL\s0 if an error
250occurred.
251.PP
252\&\fIBIO_set_fp()\fR and \fIBIO_get_fp()\fR return 1 for success or 0 for failure
253(although the current implementation never return 0).
254.PP
255\&\fIBIO_seek()\fR returns the same value as the underlying \fIfseek()\fR function:
2560 for success or \-1 for failure.
257.PP
258\&\fIBIO_tell()\fR returns the current file position.
259.PP
260\&\fIBIO_read_filename()\fR, \fIBIO_write_filename()\fR, \fIBIO_append_filename()\fR and
261\&\fIBIO_rw_filename()\fR return 1 for success or 0 for failure.
262.SH "BUGS"
263.IX Header "BUGS"
264\&\fIBIO_reset()\fR and \fIBIO_seek()\fR are implemented using \fIfseek()\fR on the underlying
265stream. The return value for \fIfseek()\fR is 0 for success or \-1 if an error
266occurred this differs from other types of \s-1BIO\s0 which will typically return
2671 for success and a non positive value if an error occurred.
268.SH "SEE ALSO"
269.IX Header "SEE ALSO"
270\&\fIBIO_seek\fR\|(3), \fIBIO_tell\fR\|(3),
271\&\fIBIO_reset\fR\|(3), \fIBIO_flush\fR\|(3),
272\&\fIBIO_read\fR\|(3),
273\&\fIBIO_write\fR\|(3), \fIBIO_puts\fR\|(3),
274\&\fIBIO_gets\fR\|(3), \fIBIO_printf\fR\|(3),
275\&\fIBIO_set_close\fR\|(3), \fIBIO_get_close\fR\|(3)
|