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annotate lib/sys_select.in.h @ 12766:2c14f1e449e5

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warn-on-use: use instead of link-warning Each *.in.h file serves two purposes - provide enough self-contained content to serve as a replacement for the system header regardless of the user's compiler, and offer the developer the ability to detect any gnulib modules that might have been inadvertantly excluded. The former requires independence from config.h, and routes everything through a Makefile.am snippet that uses @@ substitution specific to the modules that were in use, with details learned at configure time. The latter works by poisoning anything that gnulib did not replace, but which the developer had natively available, explaining why their tests passed during development. Poisoning relies on gcc features, and requires manual triggering by adding -DGNULIB_POSIXCHECK to CFLAGS; it assumes that <config.h> is properly included. In fact, we do not want to use @@ substitution for HAVE_DECL_* during poisoning, because the warning is only relevant for the gnulib modules which were not included, and thus where the m4 macros to set proper @@ values have not been run. Furthermore, we only need to poison interfaces that already have a declaration; if something is not declared, then the developer wouldn't have been able to link, so their code won't be using the problematic interface in the first place. * modules/stdio (Depends-on, Makefile.am): Drop link-warning. * modules/unistd (Depends-on, Makefile.am): Likewise. * modules/arpa_inet (Depends-on): Replace link-warning with warn-on-use. (Makefile.am): Update rules accordingly. * modules/ctype (Depends-on, Makefile.am): Likewise. * modules/dirent (Depends-on, Makefile.am): Likewise. * modules/fcntl-h (Depends-on, Makefile.am): Likewise. * modules/inttypes (Depends-on, Makefile.am): Likewise. * modules/langinfo (Depends-on, Makefile.am): Likewise. * modules/locale (Depends-on, Makefile.am): Likewise. * modules/math (Depends-on, Makefile.am): Likewise. * modules/search (Depends-on, Makefile.am): Likewise. * modules/signal (Depends-on, Makefile.am): Likewise. * modules/spawn (Depends-on, Makefile.am): Likewise. * modules/stdlib (Depends-on, Makefile.am): Likewise. * modules/string (Depends-on, Makefile.am): Likewise. * modules/strings (Depends-on, Makefile.am): Likewise. * modules/sys_file (Depends-on, Makefile.am): Likewise. * modules/sys_ioctl (Depends-on, Makefile.am): Likewise. * modules/sys_select (Depends-on, Makefile.am): Likewise. * modules/sys_socket (Depends-on, Makefile.am): Likewise. * modules/sys_stat (Depends-on, Makefile.am): Likewise. * modules/sys_times (Depends-on, Makefile.am): Likewise. * modules/sys_utsname (Depends-on, Makefile.am): Likewise. * modules/wchar (Depends-on, Makefile.am): Likewise. * m4/arpa_inet_h.m4 (gl_HEADER_ARPA_INET): Check which functions should be poisoned. * m4/ctype.m4 (gl_CTYPE_H): Likewise. * m4/dirent_h.m4 (gl_DIRENT_H): Likewise. * m4/fcntl_h.m4 (gl_FCNTL_H): Likewise. * m4/inttypes.m4 (gl_INTTYPES_H): Likewise. * m4/langinfo_h.m4 (gl_LANGINFO_H): Likewise. * m4/locale_h.m4 (gl_LOCALE_H): Likewise. * m4/math_h.m4 (gl_MATH_H): Likewise. * m4/search_h.m4 (gl_SEARCH_H): Likewise. * m4/signal_h.m4 (gl_SIGNAL_H): Likewise. * m4/spawn_h.m4 (gl_SPAWN_H): Likewise. * m4/stdio_h.m4 (gl_STDIO_H): Likewise. * m4/stdlib_h.m4 (gl_STDLIB_H): Likewise. * m4/string_h.m4 (gl_HEADER_STRING_H_BODY): Likewise. * m4/strings_h.m4 (gl_HEADER_STRINGS_H_BODY): Likewise. * m4/sys_file_h.m4 (gl_HEADER_SYS_FILE_H_DEFAULTS): Likewise. * m4/sys_ioctl_h.m4 (gl_SYS_IOCTL_H): Likewise. * m4/sys_select_h.m4 (gl_HEADER_SYS_SELECT): Likewise. * m4/sys_socket_h.m4 (gl_HEADER_SYS_SOCKET): Likewise. * m4/sys_stat_h.m4 (gl_HEADER_SYS_STAT_H): Likewise. * m4/sys_times_h.m4 (gl_SYS_TIMES_H): Likewise. * m4/sys_utsname_h.m4 (gl_SYS_UTSNAME_H): Likewise. * m4/unistd_h.m4 (gl_UNISTD_H): Likewise. * m4/wchar.m4 (gl_WCHAR_H): Likewise. * lib/arpa_inet.in.h: Use _GL_WARN_ON_USE instead of GL_LINK_WARNING. * lib/ctype.in.h: Likewise. * lib/dirent.in.h: Likewise. * lib/fcntl.in.h: Likewise. * lib/inttypes.in.h: Likewise. * lib/langinfo.in.h: Likewise. * lib/locale.in.h: Likewise. * lib/math.in.h: Likewise. * lib/search.in.h: Likewise. * lib/signal.in.h: Likewise. * lib/spawn.in.h: Likewise. * lib/stdio.in.h: Likewise. * lib/stdlib.in.h: Likewise. * lib/string.in.h: Likewise. * lib/strings.in.h: Likewise. * lib/sys_file.in.h: Likewise. * lib/sys_ioctl.in.h: Likewise. * lib/sys_select.in.h: Likewise. * lib/sys_socket.in.h: Likewise. * lib/sys_stat.in.h: Likewise. * lib/sys_times.in.h: Likewise. * lib/sys_utsname.in.h: Likewise. * lib/unistd.in.h: Likewise. * lib/wchar.in.h: Likewise. Signed-off-by: Eric Blake <ebb9@byu.net>
author Eric Blake <ebb9@byu.net>
date Wed, 16 Dec 2009 16:20:28 -0700
parents c2cbabec01dd
children 89031a1cde2f
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1 /* Substitute for <sys/select.h>.
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2 Copyright (C) 2007-2010 Free Software Foundation, Inc.
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3
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4 This program is free software; you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2, or (at your option)
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7 any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program; if not, write to the Free Software Foundation,
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16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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17
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18 # if __GNUC__ >= 3
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19 @PRAGMA_SYSTEM_HEADER@
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20 # endif
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21
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22 /* On OSF/1, <sys/types.h> and <sys/time.h> include <sys/select.h>.
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23 Simply delegate to the system's header in this case. */
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24 #if @HAVE_SYS_SELECT_H@ && defined __osf__ && (defined _SYS_TYPES_H_ && !defined _GL_SYS_SELECT_H_REDIRECT_FROM_SYS_TYPES_H) && defined _OSF_SOURCE
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25
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26 # define _GL_SYS_SELECT_H_REDIRECT_FROM_SYS_TYPES_H
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27 # @INCLUDE_NEXT@ @NEXT_SYS_SELECT_H@
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28
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29 #elif @HAVE_SYS_SELECT_H@ && defined __osf__ && (defined _SYS_TIME_H_ && !defined _GL_SYS_SELECT_H_REDIRECT_FROM_SYS_TIME_H) && defined _OSF_SOURCE
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30
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31 # define _GL_SYS_SELECT_H_REDIRECT_FROM_SYS_TIME_H
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32 # @INCLUDE_NEXT@ @NEXT_SYS_SELECT_H@
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33
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34 #else
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35
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36 #ifndef _GL_SYS_SELECT_H
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37
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38 #if @HAVE_SYS_SELECT_H@
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39
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40 /* On many platforms, <sys/select.h> assumes prior inclusion of
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41 <sys/types.h>. */
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42 # include <sys/types.h>
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43
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44 /* On OSF/1 4.0, <sys/select.h> provides only a forward declaration
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45 of 'struct timeval', and no definition of this type.
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46 But avoid namespace pollution on glibc systems. */
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47 # ifndef __GLIBC__
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48 # include <sys/time.h>
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49 # endif
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50
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51 /* On Solaris 10, <sys/select.h> provides an FD_ZERO implementation
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52 that relies on memset(), but without including <string.h>.
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53 But avoid namespace pollution on glibc systems. */
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54 # ifndef __GLIBC__
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55 # include <string.h>
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56 # endif
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57
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58 /* The include_next requires a split double-inclusion guard. */
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59 # @INCLUDE_NEXT@ @NEXT_SYS_SELECT_H@
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60
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61 #endif
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62
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63 #ifndef _GL_SYS_SELECT_H
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64 #define _GL_SYS_SELECT_H
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65
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66 #if !@HAVE_SYS_SELECT_H@
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67
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68 /* A platform that lacks <sys/select.h>. */
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69
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70 # include <sys/socket.h>
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71
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72 /* The definition of _GL_WARN_ON_USE is copied here. */
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73
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74 # ifdef __cplusplus
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75 extern "C" {
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76 # endif
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77
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78 # if @GNULIB_SELECT@
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79 # if @HAVE_WINSOCK2_H@ || @REPLACE_SELECT@
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80 # undef select
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81 # define select rpl_select
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82 extern int rpl_select (int, fd_set *, fd_set *, fd_set *, struct timeval *);
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83 # endif
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84 # elif @HAVE_WINSOCK2_H@
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85 # undef select
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86 # define select select_used_without_requesting_gnulib_module_select
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87 # elif defined GNULIB_POSIXCHECK
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88 # undef select
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89 # if HAVE_RAW_DECL_SELECT
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90 _GL_WARN_ON_USE (select, "select is not always POSIX compliant - "
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91 "use gnulib module select for portability");
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92 # endif
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93 # endif
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94
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95 # ifdef __cplusplus
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96 }
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97 # endif
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98
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99 #endif
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100
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101 #endif /* _GL_SYS_SELECT_H */
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102 #endif /* _GL_SYS_SELECT_H */
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103 #endif /* OSF/1 */