mirror of
https://git.proxmox.com/git/mirror_lxc
synced 2025-08-18 09:14:30 +00:00
macro: add new macro header
This allows us to use a bunch of macros in our static build for init.lxc.static
without having to link against all of utils.{c,h}.
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner
parent
09ef5d954f
commit
279c45eed3
@ -16,6 +16,7 @@ noinst_HEADERS = attach.h \
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log.h \
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lxc.h \
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lxclock.h \
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macro.h \
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monitor.h \
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namespace.h \
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start.h \
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@ -99,6 +100,7 @@ liblxc_la_SOURCES = af_unix.c af_unix.h \
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lxccontainer.c lxccontainer.h \
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lxclock.c lxclock.h \
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lxcseccomp.h \
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macro.h \
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mainloop.c mainloop.h \
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namespace.c namespace.h \
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nl.c nl.h \
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@ -342,6 +344,7 @@ init_lxc_static_SOURCES = cmd/lxc_init.c \
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error.c error.h \
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initutils.c initutils.h \
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log.c log.h \
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macro.h \
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namespace.c namespace.h \
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parse.c parse.h
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139
src/lxc/macro.h
Normal file
139
src/lxc/macro.h
Normal file
@ -0,0 +1,139 @@
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/* liblxcapi
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*
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* Copyright © 2018 Christian Brauner <christian.brauner@ubuntu.com>.
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* Copyright © 2018 Canonical Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef __LXC_MACRO_H
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#define __LXC_MACRO_H
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/* Define __S_ISTYPE if missing from the C library. */
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#ifndef __S_ISTYPE
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#define __S_ISTYPE(mode, mask) (((mode)&S_IFMT) == (mask))
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#endif
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#if HAVE_LIBCAP
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#ifndef CAP_SETFCAP
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#define CAP_SETFCAP 31
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#endif
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#ifndef CAP_MAC_OVERRIDE
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#define CAP_MAC_OVERRIDE 32
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#endif
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#ifndef CAP_MAC_ADMIN
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#define CAP_MAC_ADMIN 33
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#endif
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#endif
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#ifndef PR_CAPBSET_DROP
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#define PR_CAPBSET_DROP 24
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#endif
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#ifndef LO_FLAGS_AUTOCLEAR
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#define LO_FLAGS_AUTOCLEAR 4
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#endif
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#ifndef CAP_SETUID
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#define CAP_SETUID 7
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#endif
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#ifndef CAP_SETGID
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#define CAP_SETGID 6
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#endif
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/* needed for cgroup automount checks, regardless of whether we
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* have included linux/capability.h or not */
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#ifndef CAP_SYS_ADMIN
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#define CAP_SYS_ADMIN 21
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#endif
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#ifndef CGROUP_SUPER_MAGIC
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#define CGROUP_SUPER_MAGIC 0x27e0eb
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#endif
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#ifndef CGROUP2_SUPER_MAGIC
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#define CGROUP2_SUPER_MAGIC 0x63677270
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#endif
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/* Useful macros */
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/* Maximum number for 64 bit integer is a string with 21 digits: 2^64 - 1 = 21 */
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#define LXC_NUMSTRLEN64 21
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#define LXC_LINELEN 4096
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#define LXC_IDMAPLEN 4096
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#define LXC_MAX_BUFFER 4096
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/* /proc/ = 6
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* +
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* <pid-as-str> = LXC_NUMSTRLEN64
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* +
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* /fd/ = 4
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* +
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* <fd-as-str> = LXC_NUMSTRLEN64
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* +
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* \0 = 1
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*/
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#define LXC_PROC_PID_FD_LEN (6 + LXC_NUMSTRLEN64 + 4 + LXC_NUMSTRLEN64 + 1)
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/* loop devices */
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#ifndef LO_FLAGS_AUTOCLEAR
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#define LO_FLAGS_AUTOCLEAR 4
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#endif
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#ifndef LOOP_CTL_GET_FREE
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#define LOOP_CTL_GET_FREE 0x4C82
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#endif
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/* memfd_create() */
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#ifndef MFD_CLOEXEC
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#define MFD_CLOEXEC 0x0001U
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#endif
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#ifndef MFD_ALLOW_SEALING
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#define MFD_ALLOW_SEALING 0x0002U
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#endif
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/**
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* BUILD_BUG_ON - break compile if a condition is true.
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* @condition: the condition which the compiler should know is false.
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*
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* If you have some code which relies on certain constants being equal, or
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* other compile-time-evaluated condition, you should use BUILD_BUG_ON to
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* detect if someone changes it.
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*
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* The implementation uses gcc's reluctance to create a negative array, but
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* gcc (as of 4.4) only emits that error for obvious cases (eg. not arguments
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* to inline functions). So as a fallback we use the optimizer; if it can't
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* prove the condition is false, it will cause a link error on the undefined
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* "__build_bug_on_failed". This error message can be harder to track down
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* though, hence the two different methods.
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*/
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#ifndef __OPTIMIZE__
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#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
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#else
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extern int __build_bug_on_failed;
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#define BUILD_BUG_ON(condition) \
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do { \
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((void)sizeof(char[1 - 2*!!(condition)])); \
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if (condition) __build_bug_on_failed = 1; \
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} while(0)
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#endif
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#define lxc_iterate_parts(__iterator, __splitme, __separators) \
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for (char *__p = NULL, *__it = strtok_r(__splitme, __separators, &__p); \
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(__iterator = __it); \
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__iterator = __it = strtok_r(NULL, __separators, &__p))
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#endif /* __LXC_MACRO_H */
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117
src/lxc/utils.h
117
src/lxc/utils.h
@ -45,73 +45,7 @@
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#endif
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#include "initutils.h"
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/* Define __S_ISTYPE if missing from the C library. */
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#ifndef __S_ISTYPE
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#define __S_ISTYPE(mode, mask) (((mode)&S_IFMT) == (mask))
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#endif
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#if HAVE_LIBCAP
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#ifndef CAP_SETFCAP
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#define CAP_SETFCAP 31
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#endif
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#ifndef CAP_MAC_OVERRIDE
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#define CAP_MAC_OVERRIDE 32
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#endif
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#ifndef CAP_MAC_ADMIN
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#define CAP_MAC_ADMIN 33
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#endif
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#endif
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#ifndef PR_CAPBSET_DROP
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#define PR_CAPBSET_DROP 24
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#endif
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#ifndef LO_FLAGS_AUTOCLEAR
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#define LO_FLAGS_AUTOCLEAR 4
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#endif
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#ifndef CAP_SETUID
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#define CAP_SETUID 7
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#endif
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#ifndef CAP_SETGID
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#define CAP_SETGID 6
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#endif
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/* needed for cgroup automount checks, regardless of whether we
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* have included linux/capability.h or not */
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#ifndef CAP_SYS_ADMIN
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#define CAP_SYS_ADMIN 21
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#endif
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#ifndef CGROUP_SUPER_MAGIC
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#define CGROUP_SUPER_MAGIC 0x27e0eb
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#endif
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#ifndef CGROUP2_SUPER_MAGIC
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#define CGROUP2_SUPER_MAGIC 0x63677270
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#endif
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/* Useful macros */
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/* Maximum number for 64 bit integer is a string with 21 digits: 2^64 - 1 = 21 */
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#define LXC_NUMSTRLEN64 21
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#define LXC_LINELEN 4096
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#define LXC_IDMAPLEN 4096
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#define LXC_MAX_BUFFER 4096
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/* /proc/ = 6
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* +
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* <pid-as-str> = LXC_NUMSTRLEN64
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* +
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* /fd/ = 4
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* +
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* <fd-as-str> = LXC_NUMSTRLEN64
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* +
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* \0 = 1
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*/
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#define LXC_PROC_PID_FD_LEN (6 + LXC_NUMSTRLEN64 + 4 + LXC_NUMSTRLEN64 + 1)
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#include "macro.h"
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/* returns 1 on success, 0 if there were any failures */
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extern int lxc_rmdir_onedev(const char *path, const char *exclude);
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@ -265,24 +199,6 @@ static inline int signalfd(int fd, const sigset_t *mask, int flags)
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}
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#endif
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/* loop devices */
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#ifndef LO_FLAGS_AUTOCLEAR
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#define LO_FLAGS_AUTOCLEAR 4
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#endif
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#ifndef LOOP_CTL_GET_FREE
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#define LOOP_CTL_GET_FREE 0x4C82
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#endif
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/* memfd_create() */
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#ifndef MFD_CLOEXEC
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#define MFD_CLOEXEC 0x0001U
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#endif
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#ifndef MFD_ALLOW_SEALING
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#define MFD_ALLOW_SEALING 0x0002U
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#endif
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#ifndef HAVE_MEMFD_CREATE
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static inline int memfd_create(const char *name, unsigned int flags) {
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#ifndef __NR_memfd_create
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@ -359,32 +275,6 @@ extern struct lxc_popen_FILE *lxc_popen(const char *command);
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*/
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extern int lxc_pclose(struct lxc_popen_FILE *fp);
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/**
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* BUILD_BUG_ON - break compile if a condition is true.
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* @condition: the condition which the compiler should know is false.
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*
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* If you have some code which relies on certain constants being equal, or
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* other compile-time-evaluated condition, you should use BUILD_BUG_ON to
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* detect if someone changes it.
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*
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* The implementation uses gcc's reluctance to create a negative array, but
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* gcc (as of 4.4) only emits that error for obvious cases (eg. not arguments
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* to inline functions). So as a fallback we use the optimizer; if it can't
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* prove the condition is false, it will cause a link error on the undefined
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* "__build_bug_on_failed". This error message can be harder to track down
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* though, hence the two different methods.
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*/
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#ifndef __OPTIMIZE__
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#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
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#else
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extern int __build_bug_on_failed;
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#define BUILD_BUG_ON(condition) \
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do { \
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((void)sizeof(char[1 - 2*!!(condition)])); \
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if (condition) __build_bug_on_failed = 1; \
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} while(0)
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#endif
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/*
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* wait on a child we forked
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*/
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@ -620,9 +510,4 @@ extern int lxc_set_death_signal(int signal);
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extern int fd_cloexec(int fd, bool cloexec);
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extern int recursive_destroy(char *dirname);
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#define lxc_iterate_parts(__iterator, __splitme, __separators) \
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for (char *__p = NULL, *__it = strtok_r(__splitme, __separators, &__p); \
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(__iterator = __it); \
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__iterator = __it = strtok_r(NULL, __separators, &__p))
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#endif /* __LXC_UTILS_H */
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