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
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
# ttyname_r.m4 serial 13
dnl Copyright (C) 2010-2023 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_TTYNAME_R],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
dnl Persuade Solaris <unistd.h> to provide the POSIX compliant declaration of
dnl ttyname_r().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_CHECK_DECLS_ONCE([ttyname_r])
if test $ac_cv_have_decl_ttyname_r = no; then
HAVE_DECL_TTYNAME_R=0
fi
gl_CHECK_FUNCS_ANDROID([ttyname_r], [[#include <unistd.h>]])
if test $ac_cv_func_ttyname_r = no; then
HAVE_TTYNAME_R=0
case "$gl_cv_onwards_func_ttyname_r" in
future*) REPLACE_TTYNAME_R=1 ;;
esac
else
HAVE_TTYNAME_R=1
dnl On Mac OS X 10.4 (and Solaris 10 without gl_USE_SYSTEM_EXTENSIONS)
dnl the return type is 'char *', not 'int'.
AC_CACHE_CHECK([whether ttyname_r is compatible with its POSIX signature],
[gl_cv_func_ttyname_r_posix],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stddef.h>
#include <unistd.h>]],
[[*ttyname_r (0, NULL, 0);]])
],
[gl_cv_func_ttyname_r_posix=no],
[gl_cv_func_ttyname_r_posix=yes])
])
if test $gl_cv_func_ttyname_r_posix = no; then
REPLACE_TTYNAME_R=1
else
AC_DEFINE([HAVE_POSIXDECL_TTYNAME_R], [1],
[Define if the ttyname_r function has a POSIX compliant declaration.])
dnl On Solaris 10, both ttyname_r functions (the one with the non-POSIX
dnl declaration and the one with the POSIX declaration) refuse to do
dnl anything when the output buffer is less than 128 bytes large.
dnl On OSF/1 5.1, ttyname_r ignores the buffer size and assumes the
dnl buffer is large enough.
dnl On Android 4.3, ttyname_r is a stub that prints
dnl "int ttyname_r(int, char*, size_t)(3) is not implemented on Android"
dnl on stderr and returns -ERANGE.
AC_REQUIRE([AC_CANONICAL_HOST])
case "$host_os" in
linux*-android*)
AC_CACHE_CHECK([whether ttyname_r works at least minimally],
[gl_cv_func_ttyname_r_not_stub],
[AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <errno.h>
#include <unistd.h>
]GL_MDA_DEFINES[
int
main (void)
{
char buf[80];
close(2);
return ttyname_r (-1, buf, sizeof (buf)) == -ERANGE;
}]])],
[gl_cv_func_ttyname_r_not_stub=yes],
[gl_cv_func_ttyname_r_not_stub=no],
[# Guess no on Android.
gl_cv_func_ttyname_r_not_stub="guessing no"
])
])
case "$gl_cv_func_ttyname_r_not_stub" in
*yes) ;;
*) REPLACE_TTYNAME_R=1 ;;
esac
;;
esac
if test $REPLACE_TTYNAME_R = 0; then
AC_CACHE_CHECK([whether ttyname_r works with small buffers],
[gl_cv_func_ttyname_r_works],
[
dnl Initial guess, used when cross-compiling or when /dev/tty cannot
dnl be opened.
changequote(,)dnl
case "$host_os" in
# Guess no on Solaris.
solaris*) gl_cv_func_ttyname_r_works="guessing no" ;;
# Guess no on OSF/1.
osf*) gl_cv_func_ttyname_r_works="guessing no" ;;
# Guess yes otherwise.
*) gl_cv_func_ttyname_r_works="guessing yes" ;;
esac
changequote([,])dnl
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <fcntl.h>
#include <unistd.h>
]GL_MDA_DEFINES[
int
main (void)
{
int result = 0;
int fd;
char buf[31]; /* use any size < 128 here */
fd = open ("/dev/tty", O_RDONLY);
if (fd < 0)
result |= 16;
else if (ttyname_r (fd, buf, sizeof (buf)) != 0)
result |= 17;
else if (ttyname_r (fd, buf, 1) == 0)
result |= 18;
return result;
}]])],
[gl_cv_func_ttyname_r_works=yes],
[case $? in
17 | 18) gl_cv_func_ttyname_r_works=no ;;
esac],
[:])
])
case "$gl_cv_func_ttyname_r_works" in
*yes) ;;
*) REPLACE_TTYNAME_R=1 ;;
esac
fi
fi
fi
])
# Prerequisites of lib/ttyname_r.c.
AC_DEFUN([gl_PREREQ_TTYNAME_R], [
AC_CHECK_FUNCS([ttyname])
])
|
