Mercurial > gnulib
view lib/getugroups.c @ 40206:770a5696761e
relocatable-prog: Use wrapper-free installation on Mac OS X, take 2.
This approach supports relocatable installation of shared libraries
which depend on other shared libraries from the same package.
* m4/relocatable.m4 (gl_RELOCATABLE_BODY): Determine use_macos_tools.
If use_macos_tools is true, use reloc-ldflags and set LIBTOOL to be a
wrapper around the original LIBTOOL.
* build-aux/reloc-ldflags: Add support for Mac OS X, which uses the
token '@loader_path' instead of '$ORIGIN'.
* build-aux/libtool-reloc: New file.
* modules/relocatable-prog (Files): Add it.
* doc/relocatable-maint.texi (Supporting Relocation): Update to match
the recent changes. Document the need to set the *_LDFLAGS of libraries.
RELOCATABLE_LIBRARY_PATH and RELOCATABLE_CONFIG_H_DIR should be set in
Makefile.am, not in configure.ac.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Mon, 04 Mar 2019 17:25:09 +0100 |
parents | b06060465f09 |
children |
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/* getugroups.c -- return a list of the groups a user is in Copyright (C) 1990-1991, 1998-2000, 2003-2019 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. */ /* Written by David MacKenzie. */ #include <config.h> #include "getugroups.h" #include <errno.h> #include <limits.h> #include <stdio.h> /* grp.h on alpha OSF1 V2.0 uses "FILE *". */ #include <string.h> #include <unistd.h> #if !HAVE_GRP_H || defined __ANDROID__ /* Mingw lacks all things related to group management. The best we can do is fail with ENOSYS. Bionic declares e.g. getgrent() in <grp.h> but it isn't actually defined in the library. */ int getugroups (int maxcount _GL_UNUSED, gid_t *grouplist _GL_UNUSED, char const *username _GL_UNUSED, gid_t gid _GL_UNUSED) { errno = ENOSYS; return -1; } #else /* HAVE_GRP_H */ # include <grp.h> # define STREQ(a, b) (strcmp (a, b) == 0) /* Like 'getgroups', but for user USERNAME instead of for the current process. Store at most MAXCOUNT group IDs in the GROUPLIST array. If GID is not -1, store it first (if possible). GID should be the group ID (pw_gid) obtained from getpwuid, in case USERNAME is not listed in /etc/groups. Upon failure, set errno and return -1. Otherwise, return the number of IDs we've written into GROUPLIST. */ int getugroups (int maxcount, gid_t *grouplist, char const *username, gid_t gid) { int count = 0; if (gid != (gid_t) -1) { if (maxcount != 0) grouplist[count] = gid; ++count; } setgrent (); while (1) { char **cp; struct group *grp; errno = 0; grp = getgrent (); if (grp == NULL) break; for (cp = grp->gr_mem; *cp; ++cp) { int n; if ( ! STREQ (username, *cp)) continue; /* See if this group number is already on the list. */ for (n = 0; n < count; ++n) if (grouplist && grouplist[n] == grp->gr_gid) break; /* If it's a new group number, then try to add it to the list. */ if (n == count) { if (maxcount != 0) { if (count >= maxcount) goto done; grouplist[count] = grp->gr_gid; } if (count == INT_MAX) { errno = EOVERFLOW; goto done; } count++; } } } if (errno != 0) count = -1; done: { int saved_errno = errno; endgrent (); errno = saved_errno; } return count; } #endif /* HAVE_GRP_H */