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8df2a7811e
Previously this file would fail to compile with the following error:
$ gcc manual/examples/setjmp.c
manual/examples/setjmp.c: In function ‘main’:
manual/examples/setjmp.c:37:7: error: implicit declaration of function ‘do_command’ [-Wimplicit-function-declaration]
37 | do_command ();
| ^~~~~~~~~~
manual/examples/setjmp.c: At top level:
manual/examples/setjmp.c:42:1: warning: conflicting types for ‘do_command’; have ‘void(void)’
42 | do_command (void)
| ^~~~~~~~~~
manual/examples/setjmp.c:37:7: note: previous implicit declaration of ‘do_command’ with type ‘void(void)’
37 | do_command ();
| ^~~~~~~~~~
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
/* Introduction to Non-Local Exits
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Copyright (C) 1991-2025 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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#include <setjmp.h>
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#include <stdlib.h>
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#include <stdio.h>
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jmp_buf main_loop;
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void
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abort_to_main_loop (int status)
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{
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longjmp (main_loop, status);
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}
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void
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do_command (void)
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{
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char buffer[128];
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if (fgets (buffer, 128, stdin) == NULL)
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abort_to_main_loop (-1);
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else
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exit (EXIT_SUCCESS);
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}
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int
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main (void)
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{
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while (1)
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if (setjmp (main_loop))
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puts ("Back at main loop....");
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else
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do_command ();
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}
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