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author | Jörg Frings-Fürst <debian@jff.email> | 2022-02-07 06:57:44 +0100 |
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committer | Jörg Frings-Fürst <debian@jff.email> | 2022-02-07 06:57:44 +0100 |
commit | 6ffaa52cf732a84c0f8259dbc9b8183960ec5c33 (patch) | |
tree | d3136c22e3e805cfc0efe78412cce905a17e0c8d /gnulib-m4/getdtablesize.m4 | |
parent | 591cbf5878b7d4105b275585b9db1324c9dfce56 (diff) | |
parent | af151c593704a40e10efb28d1e3dd59a23a661f3 (diff) |
Merge branch 'release/debian/1.0-1'debian/1.0-1
Diffstat (limited to 'gnulib-m4/getdtablesize.m4')
-rw-r--r-- | gnulib-m4/getdtablesize.m4 | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/gnulib-m4/getdtablesize.m4 b/gnulib-m4/getdtablesize.m4 new file mode 100644 index 00000000..6134eaac --- /dev/null +++ b/gnulib-m4/getdtablesize.m4 @@ -0,0 +1,63 @@ +# getdtablesize.m4 serial 8 +dnl Copyright (C) 2008-2022 Free Software Foundation, Inc. +dnl This file is free software; the Free Software Foundation +dnl gives unlimited permission to copy and/or distribute it, +dnl with or without modifications, as long as this notice is preserved. + +AC_DEFUN([gl_FUNC_GETDTABLESIZE], +[ + AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) + AC_REQUIRE([AC_CANONICAL_HOST]) + AC_CHECK_FUNCS_ONCE([getdtablesize]) + AC_CHECK_DECLS_ONCE([getdtablesize]) + if test $ac_cv_func_getdtablesize = yes && + test $ac_cv_have_decl_getdtablesize = yes; then + AC_CACHE_CHECK([whether getdtablesize works], + [gl_cv_func_getdtablesize_works], + [dnl There are two concepts: the "maximum possible file descriptor value + 1" + dnl and the "maximum number of open file descriptors in a process". + dnl Per SUSv2 and POSIX, getdtablesize() should return the first one. + dnl On most platforms, the first and the second concept are the same. + dnl On OpenVMS, however, they are different and getdtablesize() returns + dnl the second one; thus the test below fails. But we don't care + dnl because there's no good way to write a replacement getdtablesize(). + case "$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 <unistd.h>] + GL_MDA_DEFINES + ], + [[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 | "no (limitation)") ;; + *) REPLACE_GETDTABLESIZE=1 ;; + esac + else + HAVE_GETDTABLESIZE=0 + fi +]) + +# Prerequisites of lib/getdtablesize.c. +AC_DEFUN([gl_PREREQ_GETDTABLESIZE], [:]) |