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-rw-r--r--m4/futimens.m466
1 files changed, 66 insertions, 0 deletions
diff --git a/m4/futimens.m4 b/m4/futimens.m4
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+# serial 9
+# See if we need to provide futimens replacement.
+
+dnl Copyright (C) 2009-2022 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.
+
+# Written by Eric Blake.
+
+AC_DEFUN([gl_FUNC_FUTIMENS],
+[
+ AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+ AC_CHECK_FUNCS_ONCE([futimens])
+ if test $ac_cv_func_futimens = no; then
+ HAVE_FUTIMENS=0
+ else
+ AC_CACHE_CHECK([whether futimens works],
+ [gl_cv_func_futimens_works],
+ [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <errno.h>
+]GL_MDA_DEFINES],
+ [[struct timespec ts[2];
+ int fd = creat ("conftest.file", 0600);
+ struct stat st;
+ if (fd < 0) return 1;
+ ts[0].tv_sec = 1;
+ ts[0].tv_nsec = UTIME_OMIT;
+ ts[1].tv_sec = 1;
+ ts[1].tv_nsec = UTIME_NOW;
+ errno = 0;
+ if (futimens (AT_FDCWD, NULL) == 0) return 2;
+ if (errno != EBADF) return 3;
+ if (futimens (fd, ts)) return 4;
+ sleep (1);
+ ts[0].tv_nsec = UTIME_NOW;
+ ts[1].tv_nsec = UTIME_OMIT;
+ if (futimens (fd, ts)) return 5;
+ if (fstat (fd, &st)) return 6;
+ if (st.st_ctime < st.st_atime) return 7;
+ ]])],
+ [gl_cv_func_futimens_works=yes],
+ [gl_cv_func_futimens_works=no],
+ [case "$host_os" in
+ # Guess no on glibc systems.
+ *-gnu* | gnu*) gl_cv_func_futimens_works="guessing no" ;;
+ # Guess no on musl systems.
+ *-musl*) gl_cv_func_futimens_works="guessing no" ;;
+ # Guess yes otherwise.
+ *) gl_cv_func_futimens_works="guessing yes" ;;
+ esac
+ ])
+ rm -f conftest.file])
+ case "$gl_cv_func_futimens_works" in
+ *yes) ;;
+ *)
+ REPLACE_FUTIMENS=1
+ ;;
+ esac
+ fi
+])