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Define a Scheme binding to ‘fchownat’ when it exists.

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* configure.ac: Detect whether ‘fchownat’ is available.
* libguile/filesys.c (scm_chownat): Define a Scheme binding to
  ‘fchownat’ when available.
* libguile/filesys.h (scm_chownat): Make it part of the API.
* doc/ref/posix.texi (File System): Document it.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
This commit is contained in:
Maxime Devos 2021-11-16 11:06:34 +00:00 • committed by Ludovic Courtès
parent 3b45185d8f
commit 0af3c2f509
4 changed files with 49 additions and 2 deletions
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4
configure.ac
View file

@ -509,7 +509,7 @@ AC_CHECK_HEADERS([crt_externs.h])
# isblank - available as a GNU extension or in C99
# _NSGetEnviron - Darwin specific
# strcoll_l, newlocale, uselocale, utimensat, futimens, fchmodat,
# unlinkat - POSIX.1-2008
# unlinkat, fchownat - POSIX.1-2008
# strtol_l - non-POSIX, found in glibc
# fork - unavailable on Windows
# sched_getaffinity, sched_setaffinity - GNU extensions (glibc)
@ -517,7 +517,7 @@ AC_CHECK_HEADERS([crt_externs.h])
# pipe2 - non-POSIX, found in glibc (GNU/Linux and GNU/Hurd)
#
AC_CHECK_FUNCS([DINFINITY DQNAN cexp chsize clog clog10 ctermid \
fesetround ftime ftruncate fchown fchmod fchdir readlinkat \
fesetround ftime ftruncate fchown fchownat fchmod fchdir readlinkat \
fchmodat symlinkat mkdirat renameat unlinkat getcwd geteuid getsid \
gettimeofday getuid getgid gmtime_r ioctl lstat mkdir mkdtemp mknod \
nice readlink rmdir setegid seteuid \

11
doc/ref/posix.texi
View file

@ -802,6 +802,17 @@ unsupported at present). If @var{owner} or @var{group} is specified
as @code{-1}, then that ID is not changed.
@end deffn
@findex fchownat
@deffn {Scheme Procedure} chownat dir name owner group [flags]
@deffnx {C Function} scm_chownat (dir, name, owner, group, flags)
Like @code{chown}, but modify the owner and/or group of
the file named @var{name} in the directory referred to
by the file port @var{dir} instead. The optional argument
@var{flags} is a bitmask. If @code{AT_SYMLINK_NOFOLLOW} is
present, then @var{name} will not be dereferenced if it is a
symbolic link.
@end deffn
@findex fchmod
@deffn {Scheme Procedure} chmod object mode
@deffnx {C Function} scm_chmod (object, mode)

35
libguile/filesys.c
View file

@ -180,6 +180,41 @@ SCM_DEFINE (scm_chown, "chown", 3, 0, 0,
#undef FUNC_NAME
#endif /* HAVE_CHOWN */
#ifdef HAVE_FCHOWNAT
SCM_DEFINE (scm_chownat, "chown-at", 4, 1, 0,
(SCM dir, SCM name, SCM owner, SCM group, SCM flags),
"Like @code{chown}, but modify the owner and/or group of\n"
"the file named @var{name} in the directory referred to\n"
"by the file port @var{dir} instead. The optional argument\n"
"@var{flags} is a bitmask. If @code{AT_SYMLINK_NOFOLLOW} is\n"
"present, then @var{name} will not be dereferenced if it is a\n"
"symbolic link.")
#define FUNC_NAME s_scm_chownat
{
int rv;
int dir_fdes;
int c_flags;
if (SCM_UNBNDP (flags))
c_flags = 0;
else
c_flags = scm_to_int (flags);
SCM_VALIDATE_OPFPORT (SCM_ARG1, dir);
dir_fdes = SCM_FPORT_FDES (dir);
STRING_SYSCALL (name, c_name,
rv = fchownat (dir_fdes, c_name,
scm_to_int (owner), scm_to_int (group),
c_flags));
scm_remember_upto_here_1 (dir);
if (rv == -1)
SCM_SYSERROR;
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
#endif /* HAVE_FCHOWNAT */
SCM_DEFINE (scm_open_fdes, "open-fdes", 2, 1, 0,

1
libguile/filesys.h
View file

@ -39,6 +39,7 @@ SCM_API scm_t_bits scm_tc16_dir;
SCM_API SCM scm_chown (SCM object, SCM owner, SCM group);
SCM_API SCM scm_chownat (SCM dir, SCM object, SCM owner, SCM group, SCM flags);
SCM_API SCM scm_chmod (SCM object, SCM mode);
SCM_API SCM scm_chmodat (SCM dir, SCM pathname, SCM mode, SCM flags);
SCM_API SCM scm_umask (SCM mode);