Mercurial > gnulib
view m4/chown.m4 @ 39194:a84ae461a2f6
Add cross-compilation results for GNU/Hurd.
* m4/calloc.m4: Add GNU/Hurd guess.
* m4/cbrtl.m4: Likewise.
* m4/ceil.m4: Likewise.
* m4/ceilf.m4: Likewise.
* m4/ceill.m4: Likewise.
* m4/chown.m4: Likewise.
* m4/duplocale.m4: Likewise.
* m4/exp2l.m4: Likewise.
* m4/expm1.m4: Likewise.
* m4/fchdir.m4: Likewise.
* m4/floor.m4: Likewise.
* m4/floorf.m4: Likewise.
* m4/fmod.m4: Likewise.
* m4/fmodf.m4: Likewise.
* m4/fmodl.m4: Likewise.
* m4/getcwd.m4: Likewise.
* m4/getgroups.m4: Likewise.
* m4/gettimeofday.m4: Likewise.
* m4/hypot.m4: Likewise.
* m4/hypotf.m4: Likewise.
* m4/hypotl.m4: Likewise.
* m4/link-follow.m4: Likewise.
* m4/link.m4: Likewise.
* m4/linkat.m4: Likewise.
* m4/log.m4: Likewise.
* m4/log10.m4: Likewise.
* m4/log10f.m4: Likewise.
* m4/log1p.m4: Likewise.
* m4/log1pf.m4: Likewise.
* m4/log1pl.m4: Likewise.
* m4/log2.m4: Likewise.
* m4/log2f.m4: Likewise.
* m4/logf.m4: Likewise.
* m4/lstat.m4: Likewise.
* m4/malloc.m4: Likewise.
* m4/mbrlen.m4: Likewise.
* m4/mbrtowc.m4: Likewise.
* m4/mkdir.m4: Likewise.
* m4/mkfifo.m4: Likewise.
* m4/mknod.m4: Likewise.
* m4/mkstemp.m4: Likewise.
* m4/modf.m4: Likewise.
* m4/modff.m4: Likewise.
* m4/modfl.m4: Likewise.
* m4/printf.m4: Likewise.
* m4/pselect.m4: Likewise.
* m4/ptsname.m4: Likewise.
* m4/putenv.m4: Likewise.
* m4/readlink.m4: Likewise.
* m4/realloc.m4: Likewise.
* m4/remainder.m4: Likewise.
* m4/remainderf.m4: Likewise.
* m4/remainderl.m4: Likewise.
* m4/rmdir.m4: Likewise.
* m4/round.m4: Likewise.
* m4/roundf.m4: Likewise.
* m4/roundl.m4: Likewise.
* m4/select.m4: Likewise.
* m4/setenv.m4: Likewise.
* m4/signbit.m4: Likewise.
* m4/sleep.m4: Likewise.
* m4/stat.m4: Likewise.
* m4/strerror.m4: Likewise.
* m4/strtok_r.m4: Likewise.
* m4/symlink.m4: Likewise.
* m4/symlinkat.m4: Likewise.
* m4/trunc.m4: Likewise.
* m4/truncf.m4: Likewise.
* m4/truncl.m4: Likewise.
* m4/tzset.m4: Likewise.
* m4/ungetc.m4: Likewise.
* m4/usleep.m4: Likewise.
* m4/wcwidth.m4: Likewise.
author | Samuel Thibault <samuel.thibault@gnu.org> |
---|---|
date | Fri, 29 Dec 2017 17:30:07 +0100 |
parents | a8586d5e30d2 |
children | 10eb9086bea0 |
line wrap: on
line source
# serial 29 # Determine whether we need the chown wrapper. dnl Copyright (C) 1997-2001, 2003-2005, 2007, 2009-2017 Free Software dnl 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. # chown should accept arguments of -1 for uid and gid, and it should # dereference symlinks. If it doesn't, arrange to use the replacement # function. # From Jim Meyering. # This is taken from the following Autoconf patch: # https://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=commitdiff;h=7fbb553727ed7e0e689a17594b58559ecf3ea6e9 AC_DEFUN([AC_FUNC_CHOWN], [ AC_REQUIRE([AC_TYPE_UID_T])dnl AC_REQUIRE([AC_CANONICAL_HOST])dnl for cross-compiles AC_CHECK_HEADERS([unistd.h]) AC_CACHE_CHECK([for working chown], [ac_cv_func_chown_works], [AC_RUN_IFELSE( [AC_LANG_PROGRAM( [AC_INCLUDES_DEFAULT [#include <fcntl.h> ]], [[ char *f = "conftest.chown"; struct stat before, after; if (creat (f, 0600) < 0) return 1; if (stat (f, &before) < 0) return 1; if (chown (f, (uid_t) -1, (gid_t) -1) == -1) return 1; if (stat (f, &after) < 0) return 1; return ! (before.st_uid == after.st_uid && before.st_gid == after.st_gid); ]]) ], [ac_cv_func_chown_works=yes], [ac_cv_func_chown_works=no], [case "$host_os" in # (( # Guess yes on glibc systems. *-gnu* | gnu*) ac_cv_func_chown_works="guessing yes" ;; # Guess no on native Windows. mingw*) ac_cv_func_chown_works="guessing no" ;; # If we don't know, assume the worst. *) ac_cv_func_chown_works="guessing no" ;; esac ]) rm -f conftest.chown ]) case "$ac_cv_func_chown_works" in *yes) AC_DEFINE([HAVE_CHOWN], [1], [Define to 1 if your system has a working `chown' function.]) ;; esac ])# AC_FUNC_CHOWN AC_DEFUN_ONCE([gl_FUNC_CHOWN], [ AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) AC_REQUIRE([AC_TYPE_UID_T]) AC_REQUIRE([AC_FUNC_CHOWN]) AC_REQUIRE([gl_FUNC_CHOWN_FOLLOWS_SYMLINK]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CHECK_FUNCS_ONCE([chown fchown]) dnl mingw lacks chown altogether. if test $ac_cv_func_chown = no; then HAVE_CHOWN=0 else dnl Some old systems treated chown like lchown. if test $gl_cv_func_chown_follows_symlink = no; then REPLACE_CHOWN=1 fi dnl Some old systems tried to use uid/gid -1 literally. case "$ac_cv_func_chown_works" in *no) AC_DEFINE([CHOWN_FAILS_TO_HONOR_ID_OF_NEGATIVE_ONE], [1], [Define if chown is not POSIX compliant regarding IDs of -1.]) REPLACE_CHOWN=1 ;; esac dnl Solaris 9 ignores trailing slash. dnl FreeBSD 7.2 mishandles trailing slash on symlinks. dnl Likewise for AIX 7.1. AC_CACHE_CHECK([whether chown honors trailing slash], [gl_cv_func_chown_slash_works], [touch conftest.file && rm -f conftest.link AC_RUN_IFELSE([AC_LANG_PROGRAM([[ #include <unistd.h> #include <stdlib.h> #include <errno.h> ]], [[ if (symlink ("conftest.file", "conftest.link")) return 1; if (chown ("conftest.link/", getuid (), getgid ()) == 0) return 2; ]])], [gl_cv_func_chown_slash_works=yes], [gl_cv_func_chown_slash_works=no], [case "$host_os" in # Guess yes on glibc systems. *-gnu*) gl_cv_func_chown_slash_works="guessing yes" ;; # If we don't know, assume the worst. *) gl_cv_func_chown_slash_works="guessing no" ;; esac ]) rm -f conftest.link conftest.file]) case "$gl_cv_func_chown_slash_works" in *yes) ;; *) AC_DEFINE([CHOWN_TRAILING_SLASH_BUG], [1], [Define to 1 if chown mishandles trailing slash.]) REPLACE_CHOWN=1 ;; esac dnl OpenBSD fails to update ctime if ownership does not change. AC_CACHE_CHECK([whether chown always updates ctime], [gl_cv_func_chown_ctime_works], [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ #include <unistd.h> #include <stdlib.h> #include <errno.h> #include <fcntl.h> #include <sys/stat.h> ]], [[ struct stat st1, st2; if (close (creat ("conftest.file", 0600))) return 1; if (stat ("conftest.file", &st1)) return 2; sleep (1); if (chown ("conftest.file", st1.st_uid, st1.st_gid)) return 3; if (stat ("conftest.file", &st2)) return 4; if (st2.st_ctime <= st1.st_ctime) return 5; ]])], [gl_cv_func_chown_ctime_works=yes], [gl_cv_func_chown_ctime_works=no], [case "$host_os" in # Guess yes on glibc systems. *-gnu*) gl_cv_func_chown_ctime_works="guessing yes" ;; # If we don't know, assume the worst. *) gl_cv_func_chown_ctime_works="guessing no" ;; esac ]) rm -f conftest.file]) case "$gl_cv_func_chown_ctime_works" in *yes) ;; *) AC_DEFINE([CHOWN_CHANGE_TIME_BUG], [1], [Define to 1 if chown fails to change ctime when at least one argument was not -1.]) REPLACE_CHOWN=1 ;; esac fi ]) # Determine whether chown follows symlinks (it should). AC_DEFUN_ONCE([gl_FUNC_CHOWN_FOLLOWS_SYMLINK], [ AC_CACHE_CHECK( [whether chown dereferences symlinks], [gl_cv_func_chown_follows_symlink], [ AC_RUN_IFELSE([AC_LANG_SOURCE([[ #include <unistd.h> #include <stdlib.h> #include <errno.h> int main () { int result = 0; char const *dangling_symlink = "conftest.dangle"; unlink (dangling_symlink); if (symlink ("conftest.no-such", dangling_symlink)) abort (); /* Exit successfully on a conforming system, i.e., where chown must fail with ENOENT. */ if (chown (dangling_symlink, getuid (), getgid ()) == 0) result |= 1; if (errno != ENOENT) result |= 2; return result; } ]])], [gl_cv_func_chown_follows_symlink=yes], [gl_cv_func_chown_follows_symlink=no], [gl_cv_func_chown_follows_symlink=yes] ) ] ) if test $gl_cv_func_chown_follows_symlink = no; then AC_DEFINE([CHOWN_MODIFIES_SYMLINK], [1], [Define if chown modifies symlinks.]) fi ])