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Linux: Add the sched_setattr and sched_getattr functions

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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>
This commit is contained in:
Florian Weimer 2024-09-11 10:05:08 +02:00
parent 298bc488fd
commit 21571ca0d7
41 changed files with 391 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
NEWS
View File

@ -25,6 +25,9 @@ Major new features:
which is why this mode is not enabled by default. A future version
of the library may turn it on by default, however.
* On Linux, the sched_setattr and sched_getattr have been added, for
supporting parameterized scheduling policies such as SCHED_DEADLINE.
Deprecated and removed features, and other changes affecting compatibility:
[Add deprecations, removals and changes affecting compatibility here]

115
manual/resource.texi
View File

@ -478,6 +478,7 @@ POSIX syntax had in mind.
* Absolute Priority:: The first tier of priority. Posix
* Realtime Scheduling:: Scheduling among the process nobility
* Basic Scheduling Functions:: Get/set scheduling policy, priority
* Extensible Scheduling:: Parameterized scheduling policies.
* Traditional Scheduling:: Scheduling among the vulgar masses
* CPU Affinity:: Limiting execution to certain CPUs
@end menu
@ -952,6 +953,120 @@ function, so there are no specific @code{errno} values.
@end deftypefun
@node Extensible Scheduling
@subsection Extensible Scheduling
@cindex scheduling, extensible
The type @code{struct sched_attr} and the functions @code{sched_setattr}
and @code{sched_getattr} are used to implement scheduling policies with
multiple parameters (not just priority and niceness).
It is expected that these interfaces will be compatible with all future
scheduling policies.
For additional information about scheduling policies, consult consult
the manual pages @manpageurl{sched,7} and @manpageurl{sched_setattr,2}.
@xref{Linux Kernel}.
@strong{Note:} Calling the @code{sched_setattr} function is incompatible
with support for @code{PTHREAD_PRIO_PROTECT} mutexes.
@deftp {Data Type} {struct sched_attr}
@standards{Linux, sched.h}
The @code{sched_attr} structure describes a parameterized scheduling policy.
@strong{Portability note:} In the future, additional fields can be added
to @code{struct sched_attr} at the end, so that the size of this data
type changes. Do not use it in places where this matters, such as
structure fields in installed header files, where such a change could
impact the application binary interface (ABI).
The following generic fields are available.
@table @code
@item size
The actually used size of the data structure. See the description of
the functions @code{sched_setattr} and @code{sched_getattr} below how this
field is used to support extension of @code{struct sched_attr} with
more fields.
@item sched_policy
The scheduling policy. This field determines which fields in the
structure are used, and how the @code{sched_flags} field is interpreted.
@item sched_flags
Scheduling flags associated with the scheduling policy.
@end table
In addition to the generic fields, policy-specific fields are available.
For additional information, consult the manual page
@manpageurl{sched_setattr,2}. @xref{Linux Kernel}.
@end deftp
@deftypefun int sched_setaddr (pid_t @var{tid}, struct sched_attr *@var{attr}, unsigned int flags)
@standards{Linux, sched.h}
@safety{@mtsafe{}@assafe{}@acsafe{}}
This functions applies the scheduling policy described by
@code{*@var{attr}} to the thread @var{tid} (the value zero denotes the
current thread).
It is recommended to initialize unused fields to zero, either using
@code{memset}, or using a structure initializer. The
@code{@var{attr->size}} field should be set to @code{sizeof (struct
sched_attr)}, to inform the kernel of the structure version in use.
The @var{flags} argument must be zero. Other values may become
available in the future.
On failure, @code{sched_setattr} returns @math{-1} and sets
@code{errno}. The following errors are related the way
extensibility is handled.
@table @code
@item E2BIG
A field in @code{*@var{attr}} has a non-zero value, but is unknown to
the kernel. The application could try to apply a modified policy, where
more fields are zero.
@item EINVAL
The policy in @code{@var{attr}->sched_policy} is unknown to the kernel,
or flags are set in @code{@var{attr}->sched_flags} that the kernel does
not know how to interpret. The application could try with fewer flags
set, or a different scheduling policy.
This error also occurs if @var{attr} is @code{NULL} or @var{flags} is
not zero.
@item EPERM
The current thread is not sufficiently privileged to assign the policy,
either because access to the policy is restricted in general, or because
the current thread does not have the rights to change the scheduling
policy of the thread @var{tid}.
@end table
Other error codes depend on the scheduling policy.
@end deftypefun
@deftypefun int sched_getaddr (pid_t @var{tid}, struct sched_attr *@var{attr}, unsigned int size, unsigned int flags)
@standards{Linux, sched.h}
@safety{@mtsafe{}@assafe{}@acsafe{}}
This function obtains the scheduling policy of the thread @var{tid}
(zero denotes the current thread) and store it in @code{*@var{attr}},
which must have space for at least @var{size} bytes.
The @var{flags} argument must be zero. Other values may become
available in the future.
Upon success, @code{@var{attr}->size} contains the size of the structure
version used by the kernel. Fields with offsets greater or equal to
@code{@var{attr}->size} are not updated by the kernel. To obtain
predictable values for unknown fields, use @code{memset} to set
all @var{size} bytes to zero prior to calling @code{sched_getattr}.
On failure, @code{sched_getattr} returns @math{-1} and sets @code{errno}.
If @code{errno} is @code{E2BIG}, this means that the buffer is not large
large enough, and the application could retry with a larger buffer.
@end deftypefun
@node Traditional Scheduling
@subsection Traditional Scheduling
@cindex scheduling, traditional

3
sysdeps/unix/sysv/linux/Makefile
View File

@ -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 \

4
sysdeps/unix/sysv/linux/Versions
View File

@ -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;

2
sysdeps/unix/sysv/linux/aarch64/libc.abilist
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@ -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

2
sysdeps/unix/sysv/linux/alpha/libc.abilist
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@ -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

2
sysdeps/unix/sysv/linux/arc/libc.abilist
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@ -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

2
sysdeps/unix/sysv/linux/arm/be/libc.abilist
View File

@ -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

2
sysdeps/unix/sysv/linux/arm/le/libc.abilist
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@ -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

44
sysdeps/unix/sysv/linux/bits/sched.h
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@ -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

2
sysdeps/unix/sysv/linux/csky/libc.abilist
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@ -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

2
sysdeps/unix/sysv/linux/hppa/libc.abilist
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@ -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

2
sysdeps/unix/sysv/linux/i386/libc.abilist
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@ -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

2
sysdeps/unix/sysv/linux/loongarch/lp64/libc.abilist
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@ -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

2
sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
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@ -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

2
sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
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@ -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

2
sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
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@ -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

2
sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
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@ -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

2
sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
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@ -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

2
sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
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@ -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

2
sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
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@ -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

2
sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
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@ -2817,6 +2817,8 @@ 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

2
sysdeps/unix/sysv/linux/nios2/libc.abilist
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@ -2873,3 +2873,5 @@ 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

2
sysdeps/unix/sysv/linux/or1k/libc.abilist
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@ -2259,3 +2259,5 @@ GLIBC_2.40 getcontext F
GLIBC_2.40 makecontext F
GLIBC_2.40 setcontext F
GLIBC_2.40 swapcontext F
GLIBC_2.41 sched_getattr F
GLIBC_2.41 sched_setattr F

2
sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
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@ -3138,6 +3138,8 @@ 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

2
sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
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@ -3183,6 +3183,8 @@ 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

2
sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
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@ -2892,6 +2892,8 @@ 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

2
sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
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@ -2968,3 +2968,5 @@ 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

2
sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
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@ -2512,3 +2512,5 @@ 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_2.40 __riscv_hwprobe F
GLIBC_2.41 sched_getattr F
GLIBC_2.41 sched_setattr F

2
sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
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@ -2712,3 +2712,5 @@ 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_2.40 __riscv_hwprobe F
GLIBC_2.41 sched_getattr F
GLIBC_2.41 sched_setattr F

2
sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
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@ -3136,6 +3136,8 @@ 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

2
sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
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@ -2929,6 +2929,8 @@ 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

27
sysdeps/unix/sysv/linux/sched_getattr.c Normal file
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@ -0,0 +1,27 @@
/* Reading scheduling policy and attributes.
Copyright (C) 2024 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 <sched.h>
#include <sysdep.h>
int
sched_getattr (pid_t pid, struct sched_attr *attr, unsigned int size,
unsigned int flags)
{
return INLINE_SYSCALL_CALL (sched_getattr, pid, attr, size, flags);
}

26
sysdeps/unix/sysv/linux/sched_setattr.c Normal file
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@ -0,0 +1,26 @@
/* Setting scheduling policy and attributes.
Copyright (C) 2024 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 <sched.h>
#include <sysdep.h>
int
sched_setattr (pid_t pid, struct sched_attr *attr, unsigned int flags)
{
return INLINE_SYSCALL_CALL (sched_setattr, pid, attr, flags);
}

2
sysdeps/unix/sysv/linux/sh/be/libc.abilist
View File

@ -2828,6 +2828,8 @@ 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

2
sysdeps/unix/sysv/linux/sh/le/libc.abilist
View File

@ -2825,6 +2825,8 @@ 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

2
sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
View File

@ -3157,6 +3157,8 @@ 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

2
sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
View File

@ -2793,6 +2793,8 @@ GLIBC_2.4 sys_errlist D 0x430
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

105
sysdeps/unix/sysv/linux/tst-sched_setattr.c Normal file
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@ -0,0 +1,105 @@
/* Tests for sched_setattr and sched_getattr.
Copyright (C) 2024 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 <sched.h>
#include <errno.h>
#include <stddef.h>
#include <string.h>
#include <support/check.h>
#include <sys/resource.h>
#include <unistd.h>
/* Padding struct to detect unexpected writes. */
union
{
struct sched_attr attr;
/* Hopefully the kernel will never need as much. */
unsigned char padding[4096];
} u;
static void
check_unused (void)
{
TEST_VERIFY (u.attr.size < sizeof (u));
for (unsigned int i = u.attr.size; i < sizeof (u); ++i)
TEST_COMPARE (u.padding[i], 0xcc);
}
static int
do_test (void)
{
TEST_VERIFY (sizeof (struct sched_attr) < sizeof (u));
/* Check that reading and re-applying the current policy works. */
memset (&u, 0xcc, sizeof (u));
/* Compiler barrier to bypass write access attribute. */
volatile unsigned int size = sizeof (u);
TEST_COMPARE (sched_getattr (0, (struct sched_attr *) &u, size, 0), 0);
check_unused ();
TEST_COMPARE (sched_setattr (0, &u.attr, 0), 0); /* Apply unchanged. */
/* Try to switch to the SCHED_OTHER policy. */
memset (&u, 0, sizeof (u));
u.attr.size = sizeof (u); /* With padding, kernel should accept zeroes. */
u.attr.sched_policy = SCHED_OTHER; /* Should be the default. */
{
errno = 0;
int prio = getpriority (PRIO_PROCESS, 0);
if (errno != 0)
prio = 0;
u.attr.sched_nice = prio;
}
TEST_COMPARE (sched_setattr (0, &u.attr, 0), 0);
/* Non-zero values not known to the kernel result in an E2BIG error. */
memset (&u, 0, sizeof (u));
TEST_COMPARE (sched_getattr (0, (struct sched_attr *) &u, size, 0), 0);
u.padding[u.attr.size] = 0xcc;
u.attr.size = sizeof (u);
errno = 0;
TEST_COMPARE (sched_setattr (0, &u.attr, 0), -1);
TEST_COMPARE (errno, E2BIG);
memset (&u, 0xcc, sizeof (u));
TEST_COMPARE (sched_getattr (0, (struct sched_attr *) &u, size, 0), 0);
TEST_COMPARE (u.attr.sched_policy, SCHED_OTHER);
check_unused ();
/* Raise the niceless level to 19 and observe its effect. */
TEST_COMPARE (nice (19), 19);
TEST_COMPARE (sched_getattr (0, &u.attr, sizeof (u.attr), 0), 0);
TEST_COMPARE (u.attr.sched_policy, SCHED_OTHER);
TEST_COMPARE (u.attr.sched_nice, 19);
check_unused ();
/* Invalid buffer arguments result in EINVAL (not EFAULT). */
{
errno = 0;
void *volatile null_pointer = NULL; /* compiler barrier. */
TEST_COMPARE (sched_setattr (0, null_pointer, 0), -1);
TEST_COMPARE (errno, EINVAL);
errno = 0;
TEST_COMPARE (sched_getattr (0, null_pointer, size, 0), -1);
TEST_COMPARE (errno, EINVAL);
}
return 0;
}
#include <support/test-driver.c>

2
sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
View File

@ -2744,6 +2744,8 @@ GLIBC_2.4 sys_errlist D 0x420
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

2
sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
View File

@ -2763,3 +2763,5 @@ 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