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* Add C2X timespec_getres
@ 2021-05-13 23:54 Joseph Myers
  2021-05-14  6:32 ` Paul Eggert
  2021-05-14 12:06 ` Adhemerval Zanella
  0 siblings, 2 replies; 6+ messages in thread
From: Joseph Myers @ 2021-05-13 23:54 UTC (permalink / raw)
  To: libc-alpha

ISO C2X adds a timespec_getres function alongside the C11
timespec_get, with functionality similar to that of POSIX clock_getres
(including allowing a NULL pointer to be passed to the function).
Implement this function for glibc, similarly to the implementation of
timespec_get.

This includes a basic test like that of timespec_get, but no
documentation in the manual, given that TIME_UTC and timespec_get
aren't documented in the manual at all.  The handling of 64-bit time
follows that in timespec_get; people maintaining patch series for
64-bit time will need to update them accordingly (to export
__timespec_getres64, redirect calls in time.h and run the test for
_TIME_BITS=64).

Tested for x86_64 and x86, and with build-many-glibcs.py.

diff --git a/NEWS b/NEWS
index a5631af920..266837bf2d 100644
--- a/NEWS
+++ b/NEWS
@@ -23,6 +23,8 @@ Major new features:
   /proc to be mounted.  However, different than fexecve, if the syscall is not
   supported by the kernel an error is returned instead of trying a fallback.
 
+* The ISO C2X function timespec_getres has been added.
+
 Deprecated and removed features, and other changes affecting compatibility:
 
 * The function pthread_mutex_consistent_np has been deprecated; programs
diff --git a/include/time.h b/include/time.h
index e0636132a6..4372bfbd96 100644
--- a/include/time.h
+++ b/include/time.h
@@ -28,6 +28,9 @@ libc_hidden_proto (__clock_gettime)
 extern __typeof (clock_settime) __clock_settime;
 libc_hidden_proto (__clock_settime)
 
+extern __typeof (clock_getres) __clock_getres;
+libc_hidden_proto (__clock_getres)
+
 extern __typeof (clock_nanosleep) __clock_nanosleep;
 libc_hidden_proto (__clock_nanosleep);
 
@@ -306,6 +309,7 @@ extern double __difftime (time_t time1, time_t time0);
 # define __clock_nanosleep_time64 __clock_nanosleep
 # define __clock_gettime64 __clock_gettime
 # define __timespec_get64 __timespec_get
+# define __timespec_getres64 __timespec_getres
 #else
 extern int __clock_nanosleep_time64 (clockid_t clock_id,
                                      int flags, const struct __timespec64 *req,
@@ -315,6 +319,8 @@ extern int __clock_gettime64 (clockid_t clock_id, struct __timespec64 *tp);
 libc_hidden_proto (__clock_gettime64)
 extern int __timespec_get64 (struct __timespec64 *ts, int base);
 libc_hidden_proto (__timespec_get64)
+extern int __timespec_getres64 (struct __timespec64 *ts, int base);
+libc_hidden_proto (__timespec_getres64)
 #endif
 
 #if __TIMESIZE == 64
diff --git a/sysdeps/mach/hurd/i386/libc.abilist b/sysdeps/mach/hurd/i386/libc.abilist
index fb2683edc2..49aa809366 100644
--- a/sysdeps/mach/hurd/i386/libc.abilist
+++ b/sysdeps/mach/hurd/i386/libc.abilist
@@ -2208,6 +2208,7 @@ GLIBC_2.34 __isnanf128 F
 GLIBC_2.34 __libc_start_main F
 GLIBC_2.34 _hurd_libc_proc_init F
 GLIBC_2.34 execveat F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.4 __confstr_chk F
 GLIBC_2.4 __fgets_chk F
 GLIBC_2.4 __fgets_unlocked_chk F
diff --git a/sysdeps/posix/clock_getres.c b/sysdeps/posix/clock_getres.c
index 0690ae8fcf..1eb26af6f7 100644
--- a/sysdeps/posix/clock_getres.c
+++ b/sysdeps/posix/clock_getres.c
@@ -62,6 +62,7 @@ __clock_getres (clockid_t clock_id, struct timespec *res)
 
   return retval;
 }
+libc_hidden_def (__clock_getres)
 
 versioned_symbol (libc, __clock_getres, clock_getres, GLIBC_2_17);
 /* clock_getres moved to libc in version 2.17;
diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
index ee5a5523f4..60b69d0546 100644
--- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
@@ -2431,6 +2431,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist
index 387007f7aa..0fb140518c 100644
--- a/sysdeps/unix/sysv/linux/alpha/libc.abilist
+++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist
@@ -2521,6 +2521,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/arc/libc.abilist b/sysdeps/unix/sysv/linux/arc/libc.abilist
index 2cfd596853..6ce3b1f6d7 100644
--- a/sysdeps/unix/sysv/linux/arc/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arc/libc.abilist
@@ -2190,6 +2190,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/arm/be/libc.abilist b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
index f7373394fd..6c4a689b18 100644
--- a/sysdeps/unix/sysv/linux/arm/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
@@ -300,6 +300,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
index cce828e28a..4557f07a92 100644
--- a/sysdeps/unix/sysv/linux/arm/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
@@ -297,6 +297,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/clock_getres.c b/sysdeps/unix/sysv/linux/clock_getres.c
index 14e50fbdf2..d560cd7c48 100644
--- a/sysdeps/unix/sysv/linux/clock_getres.c
+++ b/sysdeps/unix/sysv/linux/clock_getres.c
@@ -79,6 +79,7 @@ __clock_getres (clockid_t clock_id, struct timespec *res)
   return retval;
 }
 #endif
+libc_hidden_def (__clock_getres)
 
 versioned_symbol (libc, __clock_getres, clock_getres, GLIBC_2_17);
 /* clock_getres moved to libc in version 2.17;
diff --git a/sysdeps/unix/sysv/linux/csky/libc.abilist b/sysdeps/unix/sysv/linux/csky/libc.abilist
index c74d145e6b..255f02da54 100644
--- a/sysdeps/unix/sysv/linux/csky/libc.abilist
+++ b/sysdeps/unix/sysv/linux/csky/libc.abilist
@@ -2374,6 +2374,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
index 0d5acb6c89..e81d620b03 100644
--- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
+++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
@@ -2326,6 +2326,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
index e739d7788a..ae7d8d43bd 100644
--- a/sysdeps/unix/sysv/linux/i386/libc.abilist
+++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
@@ -2509,6 +2509,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist
index 975d3d3070..fa64dfab7e 100644
--- a/sysdeps/unix/sysv/linux/ia64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist
@@ -2362,6 +2362,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
index 18f69e5bd3..4979ab38a7 100644
--- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
@@ -301,6 +301,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
index c04fc80932..8b478b046c 100644
--- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
@@ -2452,6 +2452,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
index 91676762d1..784109a6d6 100644
--- a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
@@ -2425,6 +2425,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
index b61b7efc69..3c62d22b61 100644
--- a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
@@ -2422,6 +2422,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
index e053d8ad44..e158878805 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
@@ -2417,6 +2417,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
index d17deca37d..76da5e2e75 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
@@ -2415,6 +2415,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
index e1fda2a811..df7e706649 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
@@ -2423,6 +2423,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
index 4d0673d7a9..1d19304f72 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
@@ -2417,6 +2417,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist
index f417ac1d6d..6ea829d268 100644
--- a/sysdeps/unix/sysv/linux/nios2/libc.abilist
+++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist
@@ -2464,6 +2464,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
index c51ae17a5c..685a25f16b 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
@@ -2479,6 +2479,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
index de52f0b14f..d10ff1c8a2 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
@@ -2512,6 +2512,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
index 98dc2c37db..e8c6265c09 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
@@ -2327,6 +2327,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
index 8be99e5849..e3114a652f 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
@@ -2627,6 +2627,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
index aee2f59bb0..b2aa21f9dc 100644
--- a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
@@ -2192,6 +2192,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
index ef4f86b1ce..efda6de7eb 100644
--- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
@@ -2392,6 +2392,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
index 420c5eb1b0..70f7bb13db 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
@@ -2477,6 +2477,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
index e3fd068bf4..813285c91d 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
@@ -2364,6 +2364,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/sh/be/libc.abilist b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
index 7d43481afa..9a692078d3 100644
--- a/sysdeps/unix/sysv/linux/sh/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
@@ -2333,6 +2333,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/sh/le/libc.abilist b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
index adc53a4d54..dc801387cb 100644
--- a/sysdeps/unix/sysv/linux/sh/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
@@ -2330,6 +2330,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
index abcdb0deec..015a415e68 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
@@ -2470,6 +2470,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
index 2bfe9c786b..a93c45911e 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
@@ -2383,6 +2383,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/timespec_getres.c b/sysdeps/unix/sysv/linux/timespec_getres.c
new file mode 100644
index 0000000000..9e679146d3
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/timespec_getres.c
@@ -0,0 +1,50 @@
+/* Get resolution of a time base.
+   Copyright (C) 2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <time.h>
+
+/* Set TS to resolution of time base BASE.  */
+int
+__timespec_getres64 (struct __timespec64 *ts, int base)
+{
+  if (base == TIME_UTC)
+    {
+      __clock_getres64 (CLOCK_REALTIME, ts);
+      return base;
+    }
+  return 0;
+}
+
+#if __TIMESIZE != 64
+libc_hidden_def (__timespec_getres64)
+
+int
+__timespec_getres (struct timespec *ts, int base)
+{
+  int ret;
+  struct __timespec64 tp64;
+
+  ret = __timespec_getres64 (&tp64, base);
+
+  if (ret == TIME_UTC && ts != NULL)
+    *ts = valid_timespec64_to_timespec (tp64);
+
+  return ret;
+}
+#endif
+strong_alias (__timespec_getres, timespec_getres);
diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
index b6f9385076..a44b3f33b8 100644
--- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
@@ -2342,6 +2342,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
index 61ae4b65f4..507de90caf 100644
--- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
@@ -2446,6 +2446,7 @@ GLIBC_2.34 sem_wait F
 GLIBC_2.34 thrd_detach F
 GLIBC_2.34 thrd_exit F
 GLIBC_2.34 thrd_join F
+GLIBC_2.34 timespec_getres F
 GLIBC_2.34 tss_create F
 GLIBC_2.34 tss_delete F
 GLIBC_2.34 tss_get F
diff --git a/time/Makefile b/time/Makefile
index e1faeb3921..805c79c4d0 100644
--- a/time/Makefile
+++ b/time/Makefile
@@ -36,7 +36,7 @@ routines := offtime asctime clock ctime ctime_r difftime \
 	    stime dysize timegm ftime			 \
 	    getdate strptime strptime_l			 \
 	    strftime wcsftime strftime_l wcsftime_l	 \
-	    timespec_get				 \
+	    timespec_get timespec_getres		 \
 	    clock_getcpuclockid clock_getres		 \
 	    clock_gettime clock_settime clock_nanosleep
 
@@ -50,7 +50,7 @@ tests	:= test_time clocktest tst-posixtz tst-strptime tst_wcsftime \
 	   tst-clock tst-clock2 tst-clock_nanosleep tst-cpuclock1 \
 	   tst-adjtime tst-ctime tst-difftime tst-mktime4 tst-clock_settime \
 	   tst-settimeofday tst-itimer tst-gmtime tst-timegm \
-	   tst-timespec_get
+	   tst-timespec_get tst-timespec_getres
 
 include ../Rules
 
diff --git a/time/Versions b/time/Versions
index df22ac7f6a..69dad1e7b0 100644
--- a/time/Versions
+++ b/time/Versions
@@ -74,6 +74,9 @@ libc {
     clock_getres; clock_gettime; clock_settime; clock_getcpuclockid;
     clock_nanosleep;
   }
+  GLIBC_2.34 {
+    timespec_getres;
+  }
   GLIBC_PRIVATE {
     # same as clock_gettime; used in other libraries
     __clock_gettime;
diff --git a/time/clock_getres.c b/time/clock_getres.c
index 9099b62672..69d2446504 100644
--- a/time/clock_getres.c
+++ b/time/clock_getres.c
@@ -27,6 +27,7 @@ __clock_getres (clockid_t clock_id, struct timespec *res)
   __set_errno (ENOSYS);
   return -1;
 }
+libc_hidden_def (__clock_getres)
 
 versioned_symbol (libc, __clock_getres, clock_getres, GLIBC_2_17);
 /* clock_getres moved to libc in version 2.17;
diff --git a/time/time.h b/time/time.h
index 3bf206be0b..5a7f419905 100644
--- a/time/time.h
+++ b/time/time.h
@@ -259,6 +259,13 @@ extern int timespec_get (struct timespec *__ts, int __base)
 #endif
 
 
+#if __GLIBC_USE (ISOC2X)
+/* Set TS to resolution of time base BASE.  */
+extern int timespec_getres (struct timespec *__ts, int __base)
+     __THROW;
+#endif
+
+
 #ifdef __USE_XOPEN_EXTENDED
 /* Set to one of the following values to indicate an error.
      1  the DATEMSK environment variable is null or undefined,
diff --git a/time/timespec_getres.c b/time/timespec_getres.c
new file mode 100644
index 0000000000..2a5f6ede76
--- /dev/null
+++ b/time/timespec_getres.c
@@ -0,0 +1,32 @@
+/* Get resolution of a time base.
+   Copyright (C) 2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <time.h>
+
+
+/* Set TS to resolution of time base BASE.  */
+int
+timespec_getres (struct timespec *ts, int base)
+{
+  if (base == TIME_UTC)
+    {
+      __clock_getres (CLOCK_REALTIME, ts);
+      return base;
+    }
+  return 0;
+}
diff --git a/time/tst-timespec_getres.c b/time/tst-timespec_getres.c
new file mode 100644
index 0000000000..086f27f6dc
--- /dev/null
+++ b/time/tst-timespec_getres.c
@@ -0,0 +1,45 @@
+/* Basic tests for timespec_getres.
+   Copyright (C) 2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <time.h>
+#include <support/check.h>
+
+static int
+do_test (void)
+{
+  {
+    struct timespec ts;
+    TEST_COMPARE (timespec_getres (&ts, 0), 0);
+    TEST_COMPARE (timespec_getres (NULL, 0), 0);
+  }
+
+  {
+    struct timespec ts;
+    TEST_COMPARE (timespec_getres (&ts, TIME_UTC), TIME_UTC);
+    /* Expect all supported systems to support TIME_UTC with
+       resolution better than one second.  */
+    TEST_VERIFY (ts.tv_sec == 0);
+    TEST_VERIFY (ts.tv_nsec > 0);
+    TEST_VERIFY (ts.tv_nsec < 1000000000);
+    TEST_COMPARE (timespec_getres (NULL, TIME_UTC), TIME_UTC);
+  }
+
+  return 0;
+}
+
+#include <support/test-driver.c>

-- 
Joseph S. Myers
joseph@codesourcery.com

^ permalink raw reply	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2021-05-17 20:57 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-05-13 23:54 Add C2X timespec_getres Joseph Myers
2021-05-14  6:32 ` Paul Eggert
2021-05-14 11:52   ` Adhemerval Zanella
2021-05-17 19:54   ` Joseph Myers
2021-05-14 12:06 ` Adhemerval Zanella
2021-05-17 20:56   ` Joseph Myers

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