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, 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 _LIBC 50 # ifdef __UCLIBC_HAS___PROGNAME__ 51 extern const char *__progname, *__progname_full; 52 # endif 53 #endif 54 #if defined __USE_GNU && defined __UCLIBC_HAS_PROGRAM_INVOCATION_NAME__ 55 56 /* The full and simple forms of the name with which the program was 57 invoked. These variables are set up automatically at startup based on 58 the value of ARGV[0] (this works only if you use GNU ld). */ 59 extern const char *program_invocation_name, *program_invocation_short_name; 60 #endif /* __USE_GNU */ 61 #endif /* _ERRNO_H */ 62 63 __END_DECLS 64 65 #ifdef _LIBC 66 #ifdef IS_IN_rtld 67 # undef errno 68 # define errno _dl_errno 69 extern int _dl_errno; /* attribute_hidden */ 70 #elif defined __UCLIBC_HAS_TLS__ 71 # if !defined NOT_IN_libc || defined IS_IN_libpthread 72 # undef errno 73 # ifndef NOT_IN_libc 74 # define errno __libc_errno 75 # else 76 # define errno errno /* For #ifndef errno tests. */ 77 # endif 78 extern __thread int errno attribute_tls_model_ie; 79 # endif 80 #endif 81 82 #ifndef __set_errno 83 #define __set_errno(val) (errno = (val)) 84 #endif 85 #endif /* _LIBC */ 86 87 #endif /* _ERRNO_H */ 88 89 /* The Hurd <bits/errno.h> defines `error_t' as an enumerated type so 90 that printing `error_t' values in the debugger shows the names. We 91 might need this definition sometimes even if this file was included 92 before. */ 93 #if defined __USE_GNU || defined __need_error_t 94 # ifndef __error_t_defined 95 typedef int error_t; 96 # define __error_t_defined 1 97 # endif 98 # undef __need_error_t 99 #endif 100