[PATCH v2 10/11] Make second argument of gettimeofday as 'void *'

[Adhemerval Zanella <adhemerval dot zanella at linaro dot org>]

From: Zack Weinberg <zackw@panix.com>

Changes from previous version:

  - Remove warning for use of gettimeofday with a non-null __tz argument,
    the conditionals of making this work without false-positive seems quite 
    specific and fragile (gcc-only, optimized build, workaround for gcc
    bug).

--

Also make the public prototype of gettimeofday declare its second
argument with type "void *" unconditionally, consistent with POSIX.

It is also consistent with POSIX.

Checked on x86_64-linux-gnu, i686-linux-gnu, powerpc64le-linux-gnu,
powerpc64-linux-gnu, powerpc-linux-gnu, and aarch64-linux-gnu.

Co-authored-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
---
 include/sys/time.h                            |  2 +-
 .../unix/sysv/linux/aarch64/gettimeofday.c    |  4 ++--
 .../unix/sysv/linux/powerpc/gettimeofday.c    |  4 ++--
 sysdeps/unix/sysv/linux/x86/gettimeofday.c    |  4 ++--
 time/gettimeofday.c                           |  4 ++--
 time/sys/time.h                               | 23 ++++++++++---------
 6 files changed, 21 insertions(+), 20 deletions(-)

diff --git a/include/sys/time.h b/include/sys/time.h
index 2bf4297e76..a461295c6a 100644
--- a/include/sys/time.h
+++ b/include/sys/time.h
@@ -21,7 +21,7 @@
 
 # ifndef _ISOMAC
 extern int __gettimeofday (struct timeval *__tv,
-			   struct timezone *__tz);
+			   void *__tz);
 extern int __settimezone (const struct timezone *__tz)
 	attribute_hidden;
 extern int __adjtime (const struct timeval *__delta,
diff --git a/sysdeps/unix/sysv/linux/aarch64/gettimeofday.c b/sysdeps/unix/sysv/linux/aarch64/gettimeofday.c
index 075af3d0d3..7e772e05ce 100644
--- a/sysdeps/unix/sysv/linux/aarch64/gettimeofday.c
+++ b/sysdeps/unix/sysv/linux/aarch64/gettimeofday.c
@@ -31,7 +31,7 @@
 /* Used as a fallback in the ifunc resolver if VDSO is not available
    and for libc.so internal __gettimeofday calls.  */
 static int
-__gettimeofday_vsyscall (struct timeval *tv, struct timezone *tz)
+__gettimeofday_vsyscall (struct timeval *restrict tv, void *restrict tz)
 {
   if (__glibc_unlikely (tz != 0))
     memset (tz, 0, sizeof *tz);
@@ -50,7 +50,7 @@ libc_ifunc (__gettimeofday,
 
 #else
 int
-__gettimeofday (struct timeval *tv, struct timezone *tz)
+__gettimeofday (struct timeval *restrict tv, void *restrict tz)
 {
   return __gettimeofday_vsyscall (tv, tz);
 }
diff --git a/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c b/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c
index 02486dee3a..18d8f7cb7a 100644
--- a/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c
+++ b/sysdeps/unix/sysv/linux/powerpc/gettimeofday.c
@@ -24,7 +24,7 @@
 #include <sysdep-vdso.h>
 
 static int
-__gettimeofday_syscall (struct timeval *tv, struct timezone *tz)
+__gettimeofday_syscall (struct timeval *restrict tv, void *restrict tz)
 {
   if (__glibc_unlikely (tz != 0))
     memset (tz, 0, sizeof *tz);
@@ -46,7 +46,7 @@ libc_ifunc (__gettimeofday,
 	    : (void *) __gettimeofday_syscall);
 #else
 int
-__gettimeofday (struct timeval *tv, struct timezone *tz)
+__gettimeofday (struct timeval *restrict tv, void *restrict tz)
 {
   return __gettimeofday_syscall (tv, tz);
 }
diff --git a/sysdeps/unix/sysv/linux/x86/gettimeofday.c b/sysdeps/unix/sysv/linux/x86/gettimeofday.c
index cb20e358d8..190127d31e 100644
--- a/sysdeps/unix/sysv/linux/x86/gettimeofday.c
+++ b/sysdeps/unix/sysv/linux/x86/gettimeofday.c
@@ -25,7 +25,7 @@
 #include <sysdep-vdso.h>
 
 static int
-__gettimeofday_syscall (struct timeval *tv, struct timezone *tz)
+__gettimeofday_syscall (struct timeval *restrict tv, void *restrict tz)
 {
   if (__glibc_unlikely (tz != 0))
     memset (tz, 0, sizeof *tz);
@@ -45,7 +45,7 @@ libc_ifunc (__gettimeofday,
 
 #else
 int
-__gettimeofday (struct timeval *tv, struct timezone *tz)
+__gettimeofday (struct timeval *restrict tv, void *restrict tz)
 {
   return __gettimeofday_syscall (tv, tz);
 }
diff --git a/time/gettimeofday.c b/time/gettimeofday.c
index e8055b397d..ddaf46f481 100644
--- a/time/gettimeofday.c
+++ b/time/gettimeofday.c
@@ -23,10 +23,10 @@
    If *TZ is not NULL, clear it.
    Returns 0 on success, -1 on errors.  */
 int
-___gettimeofday (struct timeval *tv, struct timezone *tz)
+___gettimeofday (struct timeval *restrict tv, void *restrict tz)
 {
   if (__glibc_unlikely (tz != 0))
-    memset (tz, 0, sizeof *tz);
+    memset (tz, 0, sizeof (struct timezone));
 
   struct timespec ts;
   if (__clock_gettime (CLOCK_REALTIME, &ts))
diff --git a/time/sys/time.h b/time/sys/time.h
index f8c946f94e..0473dae339 100644
--- a/time/sys/time.h
+++ b/time/sys/time.h
@@ -54,23 +54,24 @@ struct timezone
     int tz_minuteswest;		/* Minutes west of GMT.  */
     int tz_dsttime;		/* Nonzero if DST is ever in effect.  */
   };
-
-typedef struct timezone *__restrict __timezone_ptr_t;
-#else
-typedef void *__restrict __timezone_ptr_t;
 #endif
 
-/* Get the current time of day and timezone information,
-   putting it into *TV and *TZ.  If TZ is NULL, *TZ is not filled.
-   Returns 0 on success, -1 on errors.
-   NOTE: This form of timezone information is obsolete.
-   Use the functions and variables declared in <time.h> instead.  */
+/* Get the current time of day, putting it into *TV.
+   If TZ is not null, *TZ must be a struct timezone, and both fields
+   will be set to zero.
+   Calling this function with a non-null TZ is obsolete;
+   use localtime etc. instead.
+   This function itself is semi-obsolete;
+   most callers should use time or clock_gettime instead. */
 extern int gettimeofday (struct timeval *__restrict __tv,
-			 __timezone_ptr_t __tz) __THROW __nonnull ((1));
+			 void *__restrict __tz) __THROW __nonnull ((1));
 
 #ifdef __USE_MISC
 /* Set the current time of day and timezone information.
-   This call is restricted to the super-user.  */
+   This call is restricted to the super-user.
+   Setting the timezone in this way is obsolete, but we don't yet
+   warn about it because it still has some uses for which there is
+   no alternative.  */
 extern int settimeofday (const struct timeval *__tv,
 			 const struct timezone *__tz)
      __THROW;
-- 
2.17.1