1 /* Copyright (C) 1991,92,93,94,95,96,97,2002 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, write to the Free 16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 17 02111-1307 USA. */ 18 19 /* 20 * ISO C99 Standard: 7.5 Errors <errno.h> 21 */ 22 23 #ifndef _ERRNO_H 24 25 /* The includer defined __need_Emath if he wants only the definitions 26 of EDOM and ERANGE, and not everything else. */ 27 #ifndef __need_Emath 28 # define _ERRNO_H 1 29 # include <features.h> 30 #endif 31 32 __BEGIN_DECLS 33 34 /* Get the error number constants from the system-specific file. 35 This file will test __need_Emath and _ERRNO_H. */ 36 #include <bits/errno.h> 37 #undef __need_Emath 38 39 #ifdef _ERRNO_H 40 41 /* Declare the `errno' variable, unless it's defined as a macro by 42 bits/errno.h. This is the case in GNU, where it is a per-thread 43 variable. This redeclaration using the macro still works, but it 44 will be a function declaration without a prototype and may trigger 45 a -Wstrict-prototypes warning. */ 46 #ifndef errno 47 extern int errno; 48 #endif 49 50 #ifdef __USE_GNU 51 52 /* The full and simple forms of the name with which the program was 53 invoked. These variables are set up automatically at startup based on 54 the value of ARGV[0] (this works only if you use GNU ld). */ 55 extern char *program_invocation_name, *program_invocation_short_name; 56 #endif /* __USE_GNU */ 57 #endif /* _ERRNO_H */ 58 59 __END_DECLS 60 61 #endif /* _ERRNO_H */ 62 63 /* The Hurd <bits/errno.h> defines `error_t' as an enumerated type so 64 that printing `error_t' values in the debugger shows the names. We 65 might need this definition sometimes even if this file was included 66 before. */ 67 #if defined __USE_GNU || defined __need_error_t 68 # ifndef __error_t_defined 69 typedef int error_t; 70 # define __error_t_defined 1 71 # endif 72 # undef __need_error_t 73 #endif 74