1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
.\" (c) 1993 by Thomas Koenig (ig25@rz.uni-karlsruhe.de)
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date. The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein. The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\" License.
.\" Modified Sat Jul 24 19:53:02 1993 by Rik Faith (faith@cs.unc.edu)
.TH CONFSTR 3 "April 17, 1993" "GNU" "Linux Programmer's Manual"
.SH NOME
confstr \- ler variveis string dependentes da configurao
.SH SINOPSE
.nf
.B #define _POSIX_C_SOURCE 2
ou
.B #define _XOPEN_SOURCE
.nl
.B #include <unistd.h>
.sp
.BI "size_t confstr(int " "name" ", char *" buf ", size_t " len ");"
.fi
.SH DESCRIO
.B confstr()
l os valores de variveis string dependentes da configurao.
.PP
O argumento
.I name
indica a varivel do sistema a ser retornada.
As seguintes variveis so suportadas:
.TP
.B _CS_PATH
Valor da varivel
.B PATH ,
que indica onde podem ser encontrados os utilitrios padro POSIX.2
.PP
Se
.I buf
no for
.BR NULL ,
e
.I len
for diferente de zero,
.B confstr()
copia os valores da string para
.I buf ,
truncando para
.I len \- 1
caracteres se necessrio e acrescentando um null ao final.
Isto pode ser verificado comparando o valor retornado por
.B confstr()
e
.IR len .
.PP
Se
.I len
for zero e
.I buf
for
.BR NULL ,
.B confstr()
retornar o valor definido abaixo.
.SH "VALOR RETORNADO"
Se
.I name
no corresponder a uma varivel de configurao vlida,
.B confstr()
retorna 0.
.SH EXEMPLOS
O cdigo abaixo localiza o caminho onde esto os utilitrios
POSIX.2.
.br
.nf
.in 10
char *pathbuf; size_t n;
n = confstr(_CS_PATH,NULL,(size_t)0);
if ((pathbuf = malloc(n)) == NULL) abort();
confstr(_CS_PATH, pathbuf, n);
.SH ERROS
Se o valor de
.I name
for invlido,
.I errno
ser
.BR EINVAL .
.SH "DE ACORDO COM"
proposta POSIX.2
.SH "BUGS"
POSIX.2 ainda no uma norma aprovada. A informao nesta manpage pode mudar.
.SH "VER TAMBM"
.BR sh (1),
.BR exec (3),
.BR system (3)
.SH TRADUZIDO POR LDP-BR em 21/08/2000.
\&\fR\&\f(CWPaulo Csar Mendes <drpc@ism.com.br> (traduo)\fR
\&\fR\&\f(CWxxxxxxxxxxxxxxxxxxxxxxxxx <xxx@xxxxxx.xxx.xx> (reviso)\fR
|
