diff options
Diffstat (limited to 'gnulib-m4/pselect.m4')
-rw-r--r-- | gnulib-m4/pselect.m4 | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/gnulib-m4/pselect.m4 b/gnulib-m4/pselect.m4 new file mode 100644 index 0000000..8611441 --- /dev/null +++ b/gnulib-m4/pselect.m4 @@ -0,0 +1,73 @@ +# pselect.m4 serial 10 +dnl Copyright (C) 2011-2022 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_PSELECT], +[ + AC_REQUIRE([gl_SYS_SELECT_H]) + AC_REQUIRE([AC_C_RESTRICT]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CHECK_FUNCS_ONCE([pselect]) + + if test $ac_cv_func_pselect = yes; then + AC_CACHE_CHECK([whether signature of pselect conforms to POSIX], + [gl_cv_sig_pselect], + [AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#include <sys/select.h> + ]], + [[int (*p) (int, fd_set *, fd_set *, fd_set *restrict, + struct timespec const *restrict, + sigset_t const *restrict) = pselect; + return !p;]])], + [gl_cv_sig_pselect=yes], + [gl_cv_sig_pselect=no])]) + + dnl On FreeBSD 8.2, pselect() doesn't always reject bad fds. + AC_CACHE_CHECK([whether pselect detects invalid fds], + [gl_cv_func_pselect_detects_ebadf], + [ + AC_RUN_IFELSE([AC_LANG_PROGRAM([[ +#include <sys/types.h> +#include <sys/time.h> +#if HAVE_SYS_SELECT_H +# include <sys/select.h> +#endif +#include <unistd.h> +#include <errno.h> +]GL_MDA_DEFINES], +[[ + fd_set set; + dup2(0, 16); + FD_ZERO(&set); + FD_SET(16, &set); + close(16); + struct timespec timeout; + timeout.tv_sec = 0; + timeout.tv_nsec = 5000; + return pselect (17, &set, NULL, NULL, &timeout, NULL) != -1 || errno != EBADF; +]])], [gl_cv_func_pselect_detects_ebadf=yes], + [gl_cv_func_pselect_detects_ebadf=no], + [ + case "$host_os" in + # Guess yes on Linux systems. + linux-* | linux) gl_cv_func_pselect_detects_ebadf="guessing yes" ;; + # Guess yes on glibc systems. + *-gnu* | gnu*) gl_cv_func_pselect_detects_ebadf="guessing yes" ;; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_pselect_detects_ebadf="$gl_cross_guess_normal" ;; + esac + ]) + ]) + case $gl_cv_func_pselect_detects_ebadf in + *yes) ;; + *) REPLACE_PSELECT=1 ;; + esac + fi + + if test $ac_cv_func_pselect = no || test $gl_cv_sig_pselect = no; then + REPLACE_PSELECT=1 + fi +]) |