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Date: Wed, 22 Feb 2017 05:29:22 +0300
From: "Dmitry V. Levin" <ldv@...linux.org>
To: David Miller <davem@...emloft.net>
Cc: John Stultz <john.stultz@...aro.org>,
Thomas Gleixner <tglx@...utronix.de>,
Carlos O'Donell <carlos@...hat.com>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] uapi: add a compatibility layer between linux/time.h and glibc
Do not define struct itimerspec, struct timespec, struct timeval,
and TIMER_ABSTIME in linux/time.h when <time.h> is already included
and provides these definitions.
This fixes the following compilation errors and warnings when <time.h>
is included before <linux/time.h>:
/usr/include/linux/time.h:9:8: error: redefinition of 'struct timespec'
/usr/include/linux/time.h:15:8: error: redefinition of 'struct timeval'
/usr/include/linux/time.h:34:8: error: redefinition of 'struct itimerspec'
/usr/include/linux/time.h:67:0: warning: "TIMER_ABSTIME" redefined
Do not define struct itimerval, struct timespec, struct timeval, struct
timezone, ITIMER_REAL, ITIMER_VIRTUAL, and ITIMER_PROF in linux/time.h
when <sys/time.h> is already included and provides these definitions.
This fixes the following compilation errors and warnings when <sys/time.h>
is included before <linux/time.h>:
/usr/include/linux/time.h:9:8: error: redefinition of 'struct timespec'
/usr/include/linux/time.h:15:8: error: redefinition of 'struct timeval'
/usr/include/linux/time.h:20:8: error: redefinition of 'struct timezone'
/usr/include/linux/time.h:30:0: warning: "ITIMER_REAL" redefined
/usr/include/linux/time.h:31:0: warning: "ITIMER_VIRTUAL" redefined
/usr/include/linux/time.h:32:0: warning: "ITIMER_PROF" redefined
/usr/include/linux/time.h:39:8: error: redefinition of 'struct itimerval'
Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
---
include/uapi/linux/libc-compat.h | 56 ++++++++++++++++++++++++++++++++++++++++
include/uapi/linux/time.h | 31 ++++++++++++++++++++--
2 files changed, 85 insertions(+), 2 deletions(-)
diff --git a/include/uapi/linux/libc-compat.h b/include/uapi/linux/libc-compat.h
index 44b8a6b..481e3b1 100644
--- a/include/uapi/linux/libc-compat.h
+++ b/include/uapi/linux/libc-compat.h
@@ -158,6 +158,53 @@
#endif /* defined(__NETIPX_IPX_H) */
+/* Coordinate with glibc time.h header. */
+#if (defined(__itimerspec_defined) && __itimerspec_defined) || \
+ (defined(_TIME_H) && defined(__USE_POSIX199309))
+/* __itimerspec_defined was introduced in glibc-2.25 */
+#define __UAPI_DEF_ITIMERSPEC 0
+#else
+#define __UAPI_DEF_ITIMERSPEC 1
+#endif
+
+#if (defined(__timespec_defined) && __timespec_defined) || \
+ (defined(_STRUCT_TIMESPEC) && _STRUCT_TIMESPEC)
+/* __timespec_defined was introduced in glibc-2.3.2 */
+#define __UAPI_DEF_TIMESPEC 0
+#else
+#define __UAPI_DEF_TIMESPEC 1
+#endif
+
+#if (defined(__timeval_defined) && __timeval_defined) || \
+ (defined(_STRUCT_TIMEVAL) && _STRUCT_TIMEVAL)
+/* __timeval_defined was introduced in glibc-2.25 */
+#define __UAPI_DEF_TIMEVAL 0
+#else
+#define __UAPI_DEF_TIMEVAL 1
+#endif
+
+/* Coordinate with glibc bits/time.h header. */
+#if defined(_BITS_TIME_H) && defined(__USE_POSIX199309)
+#define __UAPI_DEF_TIMER_ABSTIME 0
+#else
+#define __UAPI_DEF_TIMER_ABSTIME 1
+#endif
+
+/* Coordinate with glibc sys/time.h header. */
+#if defined(_SYS_TIME_H)
+#define __UAPI_DEF_ITIMERVAL 0
+#define __UAPI_DEF_ITIMER_REAL_VIRTUAL_PROF 0
+#else
+#define __UAPI_DEF_ITIMERVAL 1
+#define __UAPI_DEF_ITIMER_REAL_VIRTUAL_PROF 1
+#endif
+
+#if defined(_SYS_TIME_H) && defined(__USE_MISC)
+#define __UAPI_DEF_TIMEZONE 0
+#else
+#define __UAPI_DEF_TIMEZONE 1
+#endif
+
/* Definitions for xattr.h */
#if defined(_SYS_XATTR_H)
#define __UAPI_DEF_XATTR 0
@@ -205,6 +252,15 @@
#define __UAPI_DEF_IPX_CONFIG_DATA 1
#define __UAPI_DEF_IPX_ROUTE_DEF 1
+/* Definitions for time.h */
+#define __UAPI_DEF_ITIMERSPEC 1
+#define __UAPI_DEF_ITIMERVAL 1
+#define __UAPI_DEF_ITIMER_REAL_VIRTUAL_PROF 1
+#define __UAPI_DEF_TIMER_ABSTIME 1
+#define __UAPI_DEF_TIMESPEC 1
+#define __UAPI_DEF_TIMEVAL 1
+#define __UAPI_DEF_TIMEZONE 1
+
/* Definitions for xattr.h */
#define __UAPI_DEF_XATTR 1
diff --git a/include/uapi/linux/time.h b/include/uapi/linux/time.h
index e75e1b6..9d03ca4 100644
--- a/include/uapi/linux/time.h
+++ b/include/uapi/linux/time.h
@@ -1,45 +1,70 @@
#ifndef _UAPI_LINUX_TIME_H
#define _UAPI_LINUX_TIME_H
+#include <linux/libc-compat.h>
#include <linux/types.h>
+#if __UAPI_DEF_TIMESPEC
+#ifndef __timespec_defined
+#define __timespec_defined 1
+#endif
#ifndef _STRUCT_TIMESPEC
-#define _STRUCT_TIMESPEC
+#define _STRUCT_TIMESPEC 1
+#endif
struct timespec {
__kernel_time_t tv_sec; /* seconds */
long tv_nsec; /* nanoseconds */
};
-#endif
+#endif /* __UAPI_DEF_TIMESPEC */
+#if __UAPI_DEF_TIMEVAL
+#ifndef __timeval_defined
+#define __timeval_defined 1
+#endif
+#ifndef _STRUCT_TIMEVAL
+#define _STRUCT_TIMEVAL 1
+#endif
struct timeval {
__kernel_time_t tv_sec; /* seconds */
__kernel_suseconds_t tv_usec; /* microseconds */
};
+#endif /* __UAPI_DEF_TIMEVAL */
+#if __UAPI_DEF_TIMEZONE
struct timezone {
int tz_minuteswest; /* minutes west of Greenwich */
int tz_dsttime; /* type of dst correction */
};
+#endif /* __UAPI_DEF_TIMEZONE */
/*
* Names of the interval timers, and structure
* defining a timer setting:
*/
+#if __UAPI_DEF_ITIMER_REAL_VIRTUAL_PROF
#define ITIMER_REAL 0
#define ITIMER_VIRTUAL 1
#define ITIMER_PROF 2
+#endif /* __UAPI_DEF_ITIMER_REAL_VIRTUAL_PROF */
+#if __UAPI_DEF_ITIMERSPEC
+#ifndef __itimerspec_defined
+#define __itimerspec_defined 1
+#endif
struct itimerspec {
struct timespec it_interval; /* timer period */
struct timespec it_value; /* timer expiration */
};
+#endif /* __UAPI_DEF_ITIMERSPEC */
+#if __UAPI_DEF_ITIMERVAL
struct itimerval {
struct timeval it_interval; /* timer interval */
struct timeval it_value; /* current value */
};
+#endif /* __UAPI_DEF_ITIMERVAL */
/*
* The IDs of the various system clocks (for POSIX.1b interval timers):
@@ -64,6 +89,8 @@ struct itimerval {
/*
* The various flags for setting POSIX.1b interval timers:
*/
+#if __UAPI_DEF_TIMER_ABSTIME
#define TIMER_ABSTIME 0x01
+#endif
#endif /* _UAPI_LINUX_TIME_H */
--
ldv
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