From 252444aaa3a7cb9fc70289a5a3920f8a9d848109 Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Sun, 16 Jul 2017 16:22:33 -0700 Subject: [PATCH 1/3] Merge from gnulib This incorporates: 2017-07-16 explicit_bzero: new module 2017-07-15 getdtablesize: Add minimal support for OpenVMS. * lib/getdtablesize.c, lib/string.in.h, m4/getdtablesize.m4: * m4/string_h.m4: Copy from Gnulib. * lib/gnulib.mk.in: Regenerate. --- lib/getdtablesize.c | 2 +- lib/gnulib.mk.in | 6 +++++- lib/string.in.h | 17 +++++++++++++++++ m4/getdtablesize.m4 | 54 +++++++++++++++++++++++++++++++++-------------------- m4/string_h.m4 | 2 ++ 5 files changed, 59 insertions(+), 22 deletions(-) diff --git a/lib/getdtablesize.c b/lib/getdtablesize.c index c356cf4..a092863 100644 --- a/lib/getdtablesize.c +++ b/lib/getdtablesize.c @@ -1,4 +1,4 @@ -/* getdtablesize() function for platforms that don't have it. +/* getdtablesize() function: Return maximum possible file descriptor value + 1. Copyright (C) 2008-2017 Free Software Foundation, Inc. Written by Bruno Haible , 2008. diff --git a/lib/gnulib.mk.in b/lib/gnulib.mk.in index fd0f9e5..ae5ae87 100644 --- a/lib/gnulib.mk.in +++ b/lib/gnulib.mk.in @@ -125,6 +125,7 @@ GNULIB_DUP2 = @GNULIB_DUP2@ GNULIB_DUP3 = @GNULIB_DUP3@ GNULIB_ENVIRON = @GNULIB_ENVIRON@ GNULIB_EUIDACCESS = @GNULIB_EUIDACCESS@ +GNULIB_EXPLICIT_BZERO = @GNULIB_EXPLICIT_BZERO@ GNULIB_FACCESSAT = @GNULIB_FACCESSAT@ GNULIB_FCHDIR = @GNULIB_FCHDIR@ GNULIB_FCHMODAT = @GNULIB_FCHMODAT@ @@ -390,6 +391,7 @@ HAVE_DPRINTF = @HAVE_DPRINTF@ HAVE_DUP2 = @HAVE_DUP2@ HAVE_DUP3 = @HAVE_DUP3@ HAVE_EUIDACCESS = @HAVE_EUIDACCESS@ +HAVE_EXPLICIT_BZERO = @HAVE_EXPLICIT_BZERO@ HAVE_FACCESSAT = @HAVE_FACCESSAT@ HAVE_FCHDIR = @HAVE_FCHDIR@ HAVE_FCHMODAT = @HAVE_FCHMODAT@ @@ -2411,6 +2413,7 @@ string.h: string.in.h $(top_builddir)/config.status $(CXXDEFS_H) $(ARG_NONNULL_H -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \ -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \ -e 's|@''NEXT_STRING_H''@|$(NEXT_STRING_H)|g' \ + -e 's/@''GNULIB_EXPLICIT_BZERO''@/$(GNULIB_EXPLICIT_BZERO)/g' \ -e 's/@''GNULIB_FFSL''@/$(GNULIB_FFSL)/g' \ -e 's/@''GNULIB_FFSLL''@/$(GNULIB_FFSLL)/g' \ -e 's/@''GNULIB_MBSLEN''@/$(GNULIB_MBSLEN)/g' \ @@ -2449,7 +2452,8 @@ string.h: string.in.h $(top_builddir)/config.status $(CXXDEFS_H) $(ARG_NONNULL_H -e 's/@''GNULIB_STRSIGNAL''@/$(GNULIB_STRSIGNAL)/g' \ -e 's/@''GNULIB_STRVERSCMP''@/$(GNULIB_STRVERSCMP)/g' \ < $(srcdir)/string.in.h | \ - sed -e 's|@''HAVE_FFSL''@|$(HAVE_FFSL)|g' \ + sed -e 's|@''HAVE_EXPLICIT_BZERO''@|$(HAVE_EXPLICIT_BZERO)|g' \ + -e 's|@''HAVE_FFSL''@|$(HAVE_FFSL)|g' \ -e 's|@''HAVE_FFSLL''@|$(HAVE_FFSLL)|g' \ -e 's|@''HAVE_MBSLEN''@|$(HAVE_MBSLEN)|g' \ -e 's|@''HAVE_MEMCHR''@|$(HAVE_MEMCHR)|g' \ diff --git a/lib/string.in.h b/lib/string.in.h index 9a6b311..aaff563 100644 --- a/lib/string.in.h +++ b/lib/string.in.h @@ -74,6 +74,23 @@ /* The definition of _GL_WARN_ON_USE is copied here. */ +/* Clear a block of memory. The compiler will not delete a call to + this function, even if the block is dead after the call. */ +#if @GNULIB_EXPLICIT_BZERO@ +# if ! @HAVE_EXPLICIT_BZERO@ +_GL_FUNCDECL_SYS (explicit_bzero, void, + (void *__dest, size_t __n) _GL_ARG_NONNULL ((1))); +# endif +_GL_CXXALIAS_SYS (explicit_bzero, void, (void *__dest, size_t __n)); +_GL_CXXALIASWARN (explicit_bzero); +#elif defined GNULIB_POSIXCHECK +# undef explicit_bzero +# if HAVE_RAW_DECL_EXPLICIT_BZERO +_GL_WARN_ON_USE (explicit_bzero, "explicit_bzero is unportable - " + "use gnulib module explicit_bzero for portability"); +# endif +#endif + /* Find the index of the least-significant set bit. */ #if @GNULIB_FFSL@ # if address@hidden@ diff --git a/m4/getdtablesize.m4 b/m4/getdtablesize.m4 index 1af2a24..f1e4f5f 100644 --- a/m4/getdtablesize.m4 +++ b/m4/getdtablesize.m4 @@ -1,4 +1,4 @@ -# getdtablesize.m4 serial 6 +# getdtablesize.m4 serial 7 dnl Copyright (C) 2008-2017 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -12,29 +12,43 @@ AC_DEFUN AC_CHECK_DECLS_ONCE([getdtablesize]) if test $ac_cv_func_getdtablesize = yes && test $ac_cv_have_decl_getdtablesize = yes; then - # Cygwin 1.7.25 automatically increases the RLIMIT_NOFILE soft limit - # up to an unchangeable hard limit; all other platforms correctly - # require setrlimit before getdtablesize() can report a larger value. AC_CACHE_CHECK([whether getdtablesize works], [gl_cv_func_getdtablesize_works], - [AC_RUN_IFELSE([ - AC_LANG_PROGRAM([[#include ]], - [int size = getdtablesize(); - if (dup2 (0, getdtablesize()) != -1) - return 1; - if (size != getdtablesize()) - return 2; - ])], - [gl_cv_func_getdtablesize_works=yes], - [gl_cv_func_getdtablesize_works=no], - [case "$host_os" in - cygwin*) # on cygwin 1.5.25, getdtablesize() automatically grows - gl_cv_func_getdtablesize_works="guessing no" ;; - *) gl_cv_func_getdtablesize_works="guessing yes" ;; - esac]) + [dnl There are two concepts: the "maximum possible file descriptor value + 1" + dnl and the "maximum number of open file descriptors in a process". + dnl Per SUSv2 and POSIX, getdtablesize() should return the first one. + dnl On most platforms, the first and the second concept are the same. + dnl On OpenVMS, however, they are different and getdtablesize() returns + dnl the second one; thus the test below fails. But we don't care + dnl because there's no good way to write a replacement getdtablesize(). + case "$host_os" in + vms*) gl_cv_func_getdtablesize_works="no (limitation)" ;; + *) + dnl Cygwin 1.7.25 automatically increases the RLIMIT_NOFILE soft + dnl limit up to an unchangeable hard limit; all other platforms + dnl correctly require setrlimit before getdtablesize() can report + dnl a larger value. + AC_RUN_IFELSE([ + AC_LANG_PROGRAM([[#include ]], + [int size = getdtablesize(); + if (dup2 (0, getdtablesize()) != -1) + return 1; + if (size != getdtablesize()) + return 2; + ])], + [gl_cv_func_getdtablesize_works=yes], + [gl_cv_func_getdtablesize_works=no], + [case "$host_os" in + cygwin*) # on cygwin 1.5.25, getdtablesize() automatically grows + gl_cv_func_getdtablesize_works="guessing no" ;; + *) gl_cv_func_getdtablesize_works="guessing yes" ;; + esac + ]) + ;; + esac ]) case "$gl_cv_func_getdtablesize_works" in - *yes) ;; + *yes | "no (limitation)") ;; *) REPLACE_GETDTABLESIZE=1 ;; esac else diff --git a/m4/string_h.m4 b/m4/string_h.m4 index 3d2ad22..ac6311f 100644 --- a/m4/string_h.m4 +++ b/m4/string_h.m4 @@ -43,6 +43,7 @@ AC_DEFUN AC_DEFUN([gl_HEADER_STRING_H_DEFAULTS], [ + GNULIB_EXPLICIT_BZERO=0; AC_SUBST([GNULIB_EXPLICIT_BZERO]) GNULIB_FFSL=0; AC_SUBST([GNULIB_FFSL]) GNULIB_FFSLL=0; AC_SUBST([GNULIB_FFSLL]) GNULIB_MEMCHR=0; AC_SUBST([GNULIB_MEMCHR]) @@ -82,6 +83,7 @@ AC_DEFUN GNULIB_STRVERSCMP=0; AC_SUBST([GNULIB_STRVERSCMP]) HAVE_MBSLEN=0; AC_SUBST([HAVE_MBSLEN]) dnl Assume proper GNU behavior unless another module says otherwise. + HAVE_EXPLICIT_BZERO=1; AC_SUBST([HAVE_EXPLICIT_BZERO]) HAVE_FFSL=1; AC_SUBST([HAVE_FFSL]) HAVE_FFSLL=1; AC_SUBST([HAVE_FFSLL]) HAVE_MEMCHR=1; AC_SUBST([HAVE_MEMCHR]) -- 2.7.4