1 // { dg-require-fork "" }
2 // { dg-require-mkfifo "" }
4 // 2003-04-30 Petur Runolfsson <peturr02@ru.is>
6 // Copyright (C) 2003-2024 Free Software Foundation, Inc.
8 // This file is part of the GNU ISO C++ Library. This library is free
9 // software; you can redistribute it and/or modify it under the
10 // terms of the GNU General Public License as published by the
11 // Free Software Foundation; either version 3, or (at your option)
14 // This library is distributed in the hope that it will be useful,
15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 // GNU General Public License for more details.
19 // You should have received a copy of the GNU General Public License along
20 // with this library; see the file COPYING3. If not see
21 // <http://www.gnu.org/licenses/>.
23 #include <testsuite_hooks.h>
30 #include <sys/types.h>
33 // Check that cin.rdbuf()->sputbackc() puts characters back to stdin.
34 // If cin.rdbuf() is a filebuf, this succeeds when stdin is a regular
35 // file, but fails otherwise, hence the named fifo.
39 using namespace __gnu_test
;
43 const char* name
= "tmp_fifo5";
45 signal(SIGPIPE
, SIG_IGN
);
48 mkfifo(name
, S_IRWXU
);
52 test
&= bool( child
!= -1 );
56 FILE* file
= fopen(name
, "r+");
57 test
&= bool( file
!= 0 );
58 fputs("Whatever\n", file
);
67 test
&= bool( freopen(name
, "r", stdin
) );
70 int c1
= fgetc(stdin
);
71 test
&= bool( c1
!= EOF
);
72 int c2
= cin
.rdbuf()->sputbackc('a');
73 test
&= bool( c2
!= EOF
);
74 test
&= bool( c2
== 'a' );
76 int c3
= fgetc(stdin
);
77 test
&= bool( c3
!= EOF
);
78 test
&= bool( c3
== c2
);
79 int c4
= ungetc('b', stdin
);
80 test
&= bool( c4
!= EOF
);
81 test
&= bool( c4
== 'b' );
83 int c5
= cin
.rdbuf()->sgetc();
84 test
&= bool( c5
!= EOF
);
85 test
&= bool( c5
== c4
);