timerfd: new timerfd API

This is the new timerfd API as it is implemented by the following patch: int timerfd_create(int clockid, int flags); int timerfd_settime(int ufd, int flags, const struct itimerspec *utmr, struct itimerspec *otmr); int timerfd_gettime(int ufd, struct itimerspec *otmr); The timerfd_create() API creates an un-programmed timerfd fd. The "clockid" parameter can be either CLOCK_MONOTONIC or CLOCK_REALTIME. The timerfd_settime() API give new settings by the timerfd fd, by optionally retrieving the previous expiration time (in case the "otmr" parameter is not NULL). The time value specified in "utmr" is absolute, if the TFD_TIMER_ABSTIME bit is set in the "flags" parameter. Otherwise it's a relative time. The timerfd_gettime() API returns the next expiration time of the timer, or {0, 0} if the timerfd has not been set yet. Like the previous timerfd API implementation, read(2) and poll(2) are supported (with the same interface). Here's a simple test program I used to exercise the new timerfd APIs: http://www.xmailserver.org/timerfd-test2.c [akpm@linux-foundation.org: coding-style cleanups] [akpm@linux-foundation.org: fix ia64 build] [akpm@linux-foundation.org: fix m68k build] [akpm@linux-foundation.org: fix mips build] [akpm@linux-foundation.org: fix alpha, arm, blackfin, cris, m68k, s390, sparc and sparc64 builds] [heiko.carstens@de.ibm.com: fix s390] [akpm@linux-foundation.org: fix powerpc build] [akpm@linux-foundation.org: fix sparc64 more] Signed-off-by: Davide Libenzi <davidel@xmailserver.org> Cc: Michael Kerrisk <mtk-manpages@gmx.net> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Davide Libenzi <davidel@xmailserver.org> Cc: Michael Kerrisk <mtk-manpages@gmx.net> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Davide Libenzi <davidel@xmailserver.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
git-mirror · Feb 5, 2008 · 4d672e7 · 4d672e7
1 parent 5e05ad7
commit 4d672e7
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Showing 24 changed files with 210 additions and 118 deletions.
diff --git a/arch/alpha/kernel/systbls.S b/arch/alpha/kernel/systbls.S
@@ -495,7 +495,7 @@ sys_call_table:
 	.quad sys_epoll_pwait
 	.quad sys_utimensat			/* 475 */
 	.quad sys_signalfd
-	.quad sys_timerfd
+	.quad sys_ni_syscall
 	.quad sys_eventfd
 
 	.size sys_call_table, . - sys_call_table

diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
@@ -359,7 +359,7 @@
 		CALL(sys_kexec_load)
 		CALL(sys_utimensat)
 		CALL(sys_signalfd)
-/* 350 */	CALL(sys_timerfd)
+/* 350 */	CALL(sys_ni_syscall)
 		CALL(sys_eventfd)
 		CALL(sys_fallocate)
 #ifndef syscalls_counted

diff --git a/arch/blackfin/mach-common/entry.S b/arch/blackfin/mach-common/entry.S
@@ -1373,7 +1373,7 @@ ENTRY(_sys_call_table)
 	.long _sys_epoll_pwait
 	.long _sys_utimensat
 	.long _sys_signalfd
-	.long _sys_timerfd
+	.long _sys_ni_syscall
 	.long _sys_eventfd	/* 350 */
 	.long _sys_pread64
 	.long _sys_pwrite64

diff --git a/arch/cris/arch-v10/kernel/entry.S b/arch/cris/arch-v10/kernel/entry.S
@@ -1167,7 +1167,7 @@ sys_call_table:
 	.long sys_epoll_pwait
 	.long sys_utimensat		/* 320 */
 	.long sys_signalfd
-	.long sys_timerfd
+	.long sys_ni_syscall
 	.long sys_eventfd
 	.long sys_fallocate
 

diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S
@@ -1586,7 +1586,7 @@ sys_call_table:
 	data8 sys_epoll_pwait			// 1305
 	data8 sys_utimensat
 	data8 sys_signalfd
-	data8 sys_timerfd
+	data8 sys_ni_syscall
 	data8 sys_eventfd
 
 	.org sys_call_table + 8*NR_syscalls	// guard against failures to increase NR_syscalls
diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S
@@ -742,7 +742,7 @@ sys_call_table:
 	.long sys_epoll_pwait		/* 315 */
 	.long sys_utimensat
 	.long sys_signalfd
-	.long sys_timerfd
+	.long sys_ni_syscall
 	.long sys_eventfd
 	.long sys_fallocate		/* 320 */
 
diff --git a/arch/m68knommu/kernel/syscalltable.S b/arch/m68knommu/kernel/syscalltable.S
@@ -336,7 +336,7 @@ ENTRY(sys_call_table)
 	.long sys_epoll_pwait		/* 315 */
 	.long sys_utimensat
 	.long sys_signalfd
-	.long sys_timerfd
+	.long sys_ni_syscall
 	.long sys_eventfd
 	.long sys_fallocate		/* 320 */
 

diff --git a/arch/mips/kernel/scall32-o32.S b/arch/mips/kernel/scall32-o32.S
@@ -660,7 +660,7 @@ einval:	li	v0, -EINVAL
 	sys	sys_ioprio_get		2	/* 4315 */
 	sys	sys_utimensat		4
 	sys	sys_signalfd		3
-	sys	sys_timerfd		4
+	sys	sys_ni_syscall		0
 	sys	sys_eventfd		1
 	sys	sys_fallocate		6	/* 4320 */
 	.endm

diff --git a/arch/mips/kernel/scall64-64.S b/arch/mips/kernel/scall64-64.S
@@ -475,7 +475,7 @@ sys_call_table:
 	PTR	sys_ioprio_get
 	PTR	sys_utimensat			/* 5275 */
 	PTR	sys_signalfd
-	PTR	sys_timerfd
+	PTR	sys_ni_syscall
 	PTR	sys_eventfd
 	PTR	sys_fallocate
 	.size	sys_call_table,.-sys_call_table
diff --git a/arch/mips/kernel/scall64-n32.S b/arch/mips/kernel/scall64-n32.S
@@ -401,7 +401,7 @@ EXPORT(sysn32_call_table)
 	PTR	sys_ioprio_get
 	PTR	compat_sys_utimensat
 	PTR	compat_sys_signalfd		/* 5280 */
-	PTR	compat_sys_timerfd
+	PTR	sys_ni_syscall
 	PTR	sys_eventfd
 	PTR	sys_fallocate
 	.size	sysn32_call_table,.-sysn32_call_table
diff --git a/arch/mips/kernel/scall64-o32.S b/arch/mips/kernel/scall64-o32.S
@@ -523,7 +523,7 @@ sys_call_table:
 	PTR	sys_ioprio_get			/* 4315 */
 	PTR	compat_sys_utimensat
 	PTR	compat_sys_signalfd
-	PTR	compat_sys_timerfd
+	PTR	sys_ni_syscall
 	PTR	sys_eventfd
 	PTR	sys32_fallocate			/* 4320 */
 	.size	sys_call_table,.-sys_call_table
diff --git a/arch/s390/kernel/compat_wrapper.S b/arch/s390/kernel/compat_wrapper.S
@@ -1698,14 +1698,6 @@ compat_sys_signalfd_wrapper:
 	llgfr	%r4,%r4			# compat_size_t
 	jg	compat_sys_signalfd
 
-	.globl	compat_sys_timerfd_wrapper
-compat_sys_timerfd_wrapper:
-	lgfr	%r2,%r2			# int
-	lgfr	%r3,%r3			# int
-	lgfr	%r4,%r4			# int
-	llgtr	%r5,%r5			# struct compat_itimerspec *
-	jg	compat_sys_timerfd
-
 	.globl	sys_eventfd_wrapper
 sys_eventfd_wrapper:
 	llgfr	%r2,%r2			# unsigned int

diff --git a/arch/s390/kernel/syscalls.S b/arch/s390/kernel/syscalls.S
@@ -325,5 +325,5 @@ SYSCALL(sys_utimes,sys_utimes,compat_sys_utimes_wrapper)
 SYSCALL(s390_fallocate,sys_fallocate,sys_fallocate_wrapper)
 SYSCALL(sys_utimensat,sys_utimensat,compat_sys_utimensat_wrapper)	/* 315 */
 SYSCALL(sys_signalfd,sys_signalfd,compat_sys_signalfd_wrapper)
-SYSCALL(sys_timerfd,sys_timerfd,compat_sys_timerfd_wrapper)
+NI_SYSCALL						/* 317 old sys_timer_fd */
 SYSCALL(sys_eventfd,sys_eventfd,sys_eventfd_wrapper)
diff --git a/arch/sparc/kernel/systbls.S b/arch/sparc/kernel/systbls.S
@@ -79,7 +79,7 @@ sys_call_table:
 /*295*/	.long sys_fchmodat, sys_faccessat, sys_pselect6, sys_ppoll, sys_unshare
 /*300*/	.long sys_set_robust_list, sys_get_robust_list, sys_migrate_pages, sys_mbind, sys_get_mempolicy
 /*305*/	.long sys_set_mempolicy, sys_kexec_load, sys_move_pages, sys_getcpu, sys_epoll_pwait
-/*310*/	.long sys_utimensat, sys_signalfd, sys_timerfd, sys_eventfd, sys_fallocate
+/*310*/	.long sys_utimensat, sys_signalfd, sys_ni_syscall, sys_eventfd, sys_fallocate
 
 #ifdef CONFIG_SUNOS_EMUL
 	/* Now the SunOS syscall table. */

diff --git a/arch/sparc64/kernel/systbls.S b/arch/sparc64/kernel/systbls.S
@@ -80,7 +80,7 @@ sys_call_table32:
 	.word sys_fchmodat, sys_faccessat, compat_sys_pselect6, compat_sys_ppoll, sys_unshare
 /*300*/	.word compat_sys_set_robust_list, compat_sys_get_robust_list, compat_sys_migrate_pages, compat_sys_mbind, compat_sys_get_mempolicy
 	.word compat_sys_set_mempolicy, compat_sys_kexec_load, compat_sys_move_pages, sys_getcpu, compat_sys_epoll_pwait
-/*310*/	.word compat_sys_utimensat, compat_sys_signalfd, compat_sys_timerfd, sys_eventfd, compat_sys_fallocate
+/*310*/	.word compat_sys_utimensat, compat_sys_signalfd, sys_ni_syscall, sys_eventfd, compat_sys_fallocate
 
 #endif /* CONFIG_COMPAT */
 
@@ -152,7 +152,7 @@ sys_call_table:
 	.word sys_fchmodat, sys_faccessat, sys_pselect6, sys_ppoll, sys_unshare
 /*300*/	.word sys_set_robust_list, sys_get_robust_list, sys_migrate_pages, sys_mbind, sys_get_mempolicy
 	.word sys_set_mempolicy, sys_kexec_load, sys_move_pages, sys_getcpu, sys_epoll_pwait
-/*310*/	.word sys_utimensat, sys_signalfd, sys_timerfd, sys_eventfd, sys_fallocate
+/*310*/	.word sys_utimensat, sys_signalfd, sys_ni_syscall, sys_eventfd, sys_fallocate
 
 #if defined(CONFIG_SUNOS_EMUL) || defined(CONFIG_SOLARIS_EMUL) || \
     defined(CONFIG_SOLARIS_EMUL_MODULE)

diff --git a/fs/compat.c b/fs/compat.c
@@ -2206,19 +2206,41 @@ asmlinkage long compat_sys_signalfd(int ufd,
 
 #ifdef CONFIG_TIMERFD
 
-asmlinkage long compat_sys_timerfd(int ufd, int clockid, int flags,
-				   const struct compat_itimerspec __user *utmr)
+asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
+				   const struct compat_itimerspec __user *utmr,
+				   struct compat_itimerspec __user *otmr)
 {
+	int error;
 	struct itimerspec t;
 	struct itimerspec __user *ut;
 
 	if (get_compat_itimerspec(&t, utmr))
 		return -EFAULT;
-	ut = compat_alloc_user_space(sizeof(*ut));
-	if (copy_to_user(ut, &t, sizeof(t)))
+	ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
+	if (copy_to_user(&ut[0], &t, sizeof(t)))
 		return -EFAULT;
+	error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
+	if (!error && otmr)
+		error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
+			 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
+
+	return error;
+}
+
+asmlinkage long compat_sys_timerfd_gettime(int ufd,
+				   struct compat_itimerspec __user *otmr)
+{
+	int error;
+	struct itimerspec t;
+	struct itimerspec __user *ut;
 
-	return sys_timerfd(ufd, clockid, flags, ut);
+	ut = compat_alloc_user_space(sizeof(struct itimerspec));
+	error = sys_timerfd_gettime(ufd, ut);
+	if (!error)
+		error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
+			 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
+
+	return error;
 }
 
 #endif /* CONFIG_TIMERFD */