Linux: Add the sched_setattr and sched_getattr functions

And struct sched_attr.

In sysdeps/unix/sysv/linux/bits/sched.h, the hack that defines
sched_param around the inclusion of <linux/sched/types.h> is quite
ugly, but the definition of struct sched_param has already been
dropped by the kernel, so there is nothing else we can do and maintain
compatibility of <sched.h> with a wide range of kernel header
versions.  (An alternative would involve introducing a separate header
for this functionality, but this seems unnecessary.)

The existing sched_* functions that change scheduler parameters
are already incompatible with PTHREAD_PRIO_PROTECT mutexes, so
there is no harm in adding more functionality in this area.

The documentation mostly defers to the Linux manual pages.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

39 files changed, 273 insertions, 2 deletions

diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index 59998c7af4..0b45d4e42b 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -95,6 +95,8 @@ sysdep_routines += \
   process_vm_writev \
   pselect32 \
   readahead \
+  sched_getattr \
+  sched_setattr \
   setfsgid \
   setfsuid \
   setvmaname \
@@ -224,6 +226,7 @@ tests += \
   tst-process_mrelease \
   tst-quota \
   tst-rlimit-infinity \
+  tst-sched_setattr \
   tst-scm_rights \
   tst-sigtimedwait \
   tst-sync_file_range \
diff --git a/sysdeps/unix/sysv/linux/Versions b/sysdeps/unix/sysv/linux/Versions
index 268ba1b6ac..213ff5f1fe 100644
--- a/sysdeps/unix/sysv/linux/Versions
+++ b/sysdeps/unix/sysv/linux/Versions
@@ -328,6 +328,10 @@ libc {
     posix_spawnattr_getcgroup_np;
     posix_spawnattr_setcgroup_np;
   }
+  GLIBC_2.41 {
+    sched_getattr;
+    sched_setattr;
+  }
   GLIBC_PRIVATE {
     # functions used in other libraries
     __syscall_rt_sigqueueinfo;
diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
index 68eeca1c08..38db77e4f7 100644
--- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
@@ -2748,3 +2748,5 @@ GLIBC_2.39 stdc_trailing_zeros_ui F
 GLIBC_2.39 stdc_trailing_zeros_ul F
 GLIBC_2.39 stdc_trailing_zeros_ull F
 GLIBC_2.39 stdc_trailing_zeros_us F
+GLIBC_2.41 sched_getattr F
+GLIBC_2.41 sched_setattr F
diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist
index 34c187b721..637bfce9fb 100644
--- a/sysdeps/unix/sysv/linux/alpha/libc.abilist
+++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist
@@ -3095,6 +3095,8 @@ GLIBC_2.4 wcstold F
 GLIBC_2.4 wcstold_l F
 GLIBC_2.4 wprintf F
 GLIBC_2.4 wscanf F
+GLIBC_2.41 sched_getattr F
+GLIBC_2.41 sched_setattr F
 GLIBC_2.5 __readlinkat_chk F
 GLIBC_2.5 inet6_opt_append F
 GLIBC_2.5 inet6_opt_find F
diff --git a/sysdeps/unix/sysv/linux/arc/libc.abilist b/sysdeps/unix/sysv/linux/arc/libc.abilist
index 916c18ea94..4a305cf730 100644
--- a/sysdeps/unix/sysv/linux/arc/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arc/libc.abilist
@@ -2509,3 +2509,5 @@ GLIBC_2.39 stdc_trailing_zeros_ui F
 GLIBC_2.39 stdc_trailing_zeros_ul F
 GLIBC_2.39 stdc_trailing_zeros_ull F
 GLIBC_2.39 stdc_trailing_zeros_us F
+GLIBC_2.41 sched_getattr F
+GLIBC_2.41 sched_setattr F
diff --git a/sysdeps/unix/sysv/linux/arm/be/libc.abilist b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
index ea95de282a..1d54f71b14 100644
--- a/sysdeps/unix/sysv/linux/arm/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
@@ -2801,6 +2801,8 @@ GLIBC_2.4 xdrstdio_create F
 GLIBC_2.4 xencrypt F
 GLIBC_2.4 xprt_register F
 GLIBC_2.4 xprt_unregister F
+GLIBC_2.41 sched_getattr F
+GLIBC_2.41 sched_setattr F
 GLIBC_2.5 __readlinkat_chk F
 GLIBC_2.5 inet6_opt_append F
 GLIBC_2.5 inet6_opt_find F
diff --git a/sysdeps/unix/sysv/linux/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
index 1cdbc983e1..ff7e8bc40b 100644
--- a/sysdeps/unix/sysv/linux/arm/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
@@ -2798,6 +2798,8 @@ GLIBC_2.4 xdrstdio_create F
 GLIBC_2.4 xencrypt F
 GLIBC_2.4 xprt_register F
 GLIBC_2.4 xprt_unregister F
+GLIBC_2.41 sched_getattr F
+GLIBC_2.41 sched_setattr F
 GLIBC_2.5 __readlinkat_chk F
 GLIBC_2.5 inet6_opt_append F
 GLIBC_2.5 inet6_opt_find F
diff --git a/sysdeps/unix/sysv/linux/bits/sched.h b/sysdeps/unix/sysv/linux/bits/sched.h
index a53e1362a0..e5b7efb887 100644
--- a/sysdeps/unix/sysv/linux/bits/sched.h
+++ b/sysdeps/unix/sysv/linux/bits/sched.h
@@ -34,10 +34,39 @@
 # define SCHED_IDLE		5
 # define SCHED_DEADLINE		6
 
+/* Flags that can be used in policy values.  */
 # define SCHED_RESET_ON_FORK	0x40000000
-#endif
 
-#ifdef __USE_GNU
+/* Use "" to work around incorrect macro expansion of the
+   __has_include argument (GCC PR 80005).  */
+# ifdef __has_include
+#  if __has_include ("linux/sched/types.h")
+/* Some older Linux versions defined sched_param in <linux/sched/types.h>.  */
+#   define sched_param __glibc_mask_sched_param
+#   include <linux/sched/types.h>
+#   undef sched_param
+#  endif
+# endif
+# ifndef SCHED_ATTR_SIZE_VER0
+#  include <linux/types.h>
+#  define SCHED_ATTR_SIZE_VER0 48
+#  define SCHED_ATTR_SIZE_VER1 56
+struct sched_attr
+{
+  __u32 size;
+  __u32 sched_policy;
+  __u64 sched_flags;
+  __s32 sched_nice;
+  __u32 sched_priority;
+  __u64 sched_runtime;
+  __u64 sched_deadline;
+  __u64 sched_period;
+  __u32 sched_util_min;
+  __u32 sched_util_max;
+  /* Additional fields may be added at the end.  */
+};
+# endif /* !SCHED_ATTR_SIZE_VER0 */
+
 /* Cloning flags.  */
 # define CSIGNAL       0x000000ff /* Signal mask to be sent at exit.  */
 # define CLONE_VM      0x00000100 /* Set if VM shared between processes.  */
@@ -97,6 +126,17 @@ extern int getcpu (unsigned int *, unsigned int *) __THROW;
 
 /* Switch process to namespace of type NSTYPE indicated by FD.  */
 extern int setns (int __fd, int __nstype) __THROW;
+
+/* Apply the scheduling attributes from *ATTR to the process or thread TID.  */
+int sched_setattr (pid_t tid, struct sched_attr *attr, unsigned int flags)
+  __THROW __nonnull ((2));
+
+/* Obtain the scheduling attributes of the process or thread TID and
+   store it in *ATTR.  */
+int sched_getattr (pid_t tid, struct sched_attr *attr, unsigned int size,
+		   unsigned int flags)
+  __THROW __nonnull ((2)) __attr_access ((__write_only__, 2, 3));
+
 #endif
 
 __END_DECLS
diff --git a/sysdeps/unix/sysv/linux/csky/libc.abilist b/sysdeps/unix/sysv/linux/csky/libc.abilist
index 96d45961e2..c3ed65467d 100644
--- a/sysdeps/unix/sysv/linux/csky/libc.abilist
+++ b/sysdeps/unix/sysv/linux/csky/libc.abilist
@@ -2785,3 +2785,5 @@ GLIBC_2.39 stdc_trailing_zeros_ui F
 GLIBC_2.39 stdc_trailing_zeros_ul F
 GLIBC_2.39 stdc_trailing_zeros_ull F
 GLIBC_2.39 stdc_trailing_zeros_us F
+GLIBC_2.41 sched_getattr F
+GLIBC_2.41 sched_setattr F
diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
index fbcd60c2b3..8de7644a59 100644
--- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
+++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
@@ -2821,6 +2821,8 @@ GLIBC_2.4 sys_errlist D 0x400
 GLIBC_2.4 sys_nerr D 0x4
 GLIBC_2.4 unlinkat F
 GLIBC_2.4 unshare F
+GLIBC_2.41 sched_getattr F
+GLIBC_2.41 sched_setattr F
 GLIBC_2.5 __readlinkat_chk F
 GLIBC_2.5 inet6_opt_append F
 GLIBC_2.5 inet6_opt_find F
diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
index c989b433c0..4fedf775d4 100644
--- a/sysdeps/unix/sysv/linux/i386/libc.abilist
+++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
@@ -3005,6 +3005,8 @@ GLIBC_2.4 sys_errlist D 0x210
 GLIBC_2.4 sys_nerr D 0x4
 GLIBC_2.4 unlinkat F
 GLIBC_2.4 unshare F
+GLIBC_2.41 sched_getattr F
+GLIBC_2.41 sched_setattr F
 GLIBC_2.5 __readlinkat_chk F
 GLIBC_2.5 inet6_opt_append F
 GLIBC_2.5 inet6_opt_find F
diff --git a/sysdeps/unix/sysv/linux/loongarch/lp64/libc.abilist b/sysdeps/unix/sysv/linux/loongarch/lp64/libc.abilist
index 0023ec1fa1..0024282289 100644
--- a/sysdeps/unix/sysv/linux/loongarch/lp64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/loongarch/lp64/libc.abilist
@@ -2269,3 +2269,5 @@ GLIBC_2.39 stdc_trailing_zeros_ui F
 GLIBC_2.39 stdc_trailing_zeros_ul F
 GLIBC_2.39 stdc_trailing_zeros_ull F
 GLIBC_2.39 stdc_trailing_zeros_us F
+GLIBC_2.41 sched_getattr F
+GLIBC_2.41 sched_setattr F
diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
index d9bd6a9b56..142595eb3e 100644
--- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
@@ -2781,6 +2781,8 @@ GLIBC_2.4 xdrstdio_create F
 GLIBC_2.4 xencrypt F
 GLIBC_2.4 xprt_register F
 GLIBC_2.4 xprt_unregister F
+GLIBC_2.41 sched_getattr F
+GLIBC_2.41 sched_setattr F
 GLIBC_2.5 __readlinkat_chk F
 GLIBC_2.5 inet6_opt_append F
 GLIBC_2.5 inet6_opt_find F
diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
index 439796d693..85e7746c10 100644
--- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
@@ -2948,6 +2948,8 @@ GLIBC_2.4 sys_errlist D 0x210
 GLIBC_2.4 sys_nerr D 0x4
 GLIBC_2.4 unlinkat F
 GLIBC_2.4 unshare F
+GLIBC_2.41 sched_getattr F
+GLIBC_2.41 sched_setattr F
 GLIBC_2.5 __readlinkat_chk F
 GLIBC_2.5 inet6_opt_append F
 GLIBC_2.5 inet6_opt_find F
diff --git a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
index 1069d3252c..91dc1b8378 100644
--- a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
@@ -2834,3 +2834,5 @@ GLIBC_2.39 stdc_trailing_zeros_ui F
 GLIBC_2.39 stdc_trailing_zeros_ul F
 GLIBC_2.39 stdc_trailing_zeros_ull F
 GLIBC_2.39 stdc_trailing_zeros_us F
+GLIBC_2.41 sched_getattr F
+GLIBC_2.41 sched_setattr F
diff --git a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
index 17abe08c8b..3440e90f6f 100644
--- a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
@@ -2831,3 +2831,5 @@ GLIBC_2.39 stdc_trailing_zeros_ui F
 GLIBC_2.39 stdc_trailing_zeros_ul F
 GLIBC_2.39 stdc_trailing_zeros_ull F
 GLIBC_2.39 stdc_trailing_zeros_us F
+GLIBC_2.41 sched_getattr F
+GLIBC_2.41 sched_setattr F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
index 799e508950..5ee7b8c52f 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
@@ -2909,6 +2909,8 @@ GLIBC_2.4 renameat F
 GLIBC_2.4 symlinkat F
 GLIBC_2.4 unlinkat F
 GLIBC_2.4 unshare F
+GLIBC_2.41 sched_getattr F
+GLIBC_2.41 sched_setattr F
 GLIBC_2.5 __readlinkat_chk F
 GLIBC_2.5 inet6_opt_append F
 GLIBC_2.5 inet6_opt_find F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
index 1c10996cbc..6cb6328e7c 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
@@ -2907,6 +2907,8 @@ GLIBC_2.4 renameat F
 GLIBC_2.4 symlinkat F
 GLIBC_2.4 unlinkat F
 GLIBC_2.4 unshare F
+GLIBC_2.41 sched_getattr F
+GLIBC_2.41 sched_setattr F
 GLIBC_2.5 __readlinkat_chk F
 GLIBC_2.5 inet6_opt_append F
 GLIBC_2.5 inet6_opt_find F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
index 03d9655f26..ae7474c0f0 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
@@ -2915,6 +2915,8 @@ GLIBC_2.4 renameat F
 GLIBC_2.4 symlinkat F
 GLIBC_2.4 unlinkat F
 GLIBC_2.4 unshare F
+GLIBC_2.41 sched_getattr F
+GLIBC_2.41 sched_setattr F
 GLIBC_2.5 __readlinkat_chk F
 GLIBC_2.5 inet6_opt_append F
 GLIBC_2.5 inet6_opt_find F