1 /* Copyright (C) 1991-2015 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, see 16 <http://www.gnu.org/licenses/>. */ 17 18 /* 19 * ISO C99 Standard: 7.5 Errors <errno.h> 20 */ 21 22 #ifndef _ERRNO_H 23 24 /* The includer defined __need_Emath if he wants only the definitions 25 of EDOM and ERANGE, and not everything else. */ 26 #ifndef __need_Emath 27 # define _ERRNO_H 1 28 # include <features.h> 29 #endif 30 31 __BEGIN_DECLS 32 33 /* Get the error number constants from the system-specific file. 34 This file will test __need_Emath and _ERRNO_H. */ 35 #include <bits/errno.h> 36 #undef __need_Emath 37 38 #ifdef _ERRNO_H 39 40 /* Declare the `errno' variable, unless it's defined as a macro by 41 bits/errno.h. This is the case in GNU, where it is a per-thread 42 variable. This redeclaration using the macro still works, but it 43 will be a function declaration without a prototype and may trigger 44 a -Wstrict-prototypes warning. */ 45 #ifndef errno 46 extern int errno; 47 #endif 48 49 #ifdef __USE_GNU 50 51 /* The full and simple forms of the name with which the program was 52 invoked. These variables are set up automatically at startup based on 53 the value of ARGV[0] (this works only if you use GNU ld). */ 54 extern char *program_invocation_name, *program_invocation_short_name; 55 #endif /* __USE_GNU */ 56 #endif /* _ERRNO_H */ 57 58 __END_DECLS 59 60 #endif /* _ERRNO_H */ 61 62 /* The Hurd <bits/errno.h> defines `error_t' as an enumerated type so 63 that printing `error_t' values in the debugger shows the names. We 64 might need this definition sometimes even if this file was included 65 before. */ 66 #if defined __USE_GNU || defined __need_error_t 67 # ifndef __error_t_defined 68 typedef int error_t; 69 # define __error_t_defined 1 70 # endif 71 # undef __need_error_t 72 #endif 73