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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . O S _ I N T E R F A C E --
-- --
-- S p e c --
-- --
-- Copyright (C) 1995-2021, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNARL was developed by the GNARL team at Florida State University. --
-- Extensive contributions were provided by Ada Core Technologies, Inc. --
-- --
------------------------------------------------------------------------------
-- This is an Android version of this package which is based on the
-- GNU/Linux version
-- This package encapsulates all direct interfaces to OS services
-- that are needed by the tasking run-time (libgnarl).
-- PLEASE DO NOT add any with-clauses to this package or remove the pragma
-- Preelaborate. This package is designed to be a bottom-level (leaf) package.
with Ada.Unchecked_Conversion;
with Interfaces.C;
with System.Linux;
with System.OS_Constants;
with System.Parameters;
package System.OS_Interface is
pragma Preelaborate;
subtype int is Interfaces.C.int;
subtype char is Interfaces.C.char;
subtype short is Interfaces.C.short;
subtype long is Interfaces.C.long;
subtype unsigned is Interfaces.C.unsigned;
subtype unsigned_short is Interfaces.C.unsigned_short;
subtype unsigned_long is Interfaces.C.unsigned_long;
subtype unsigned_char is Interfaces.C.unsigned_char;
subtype plain_char is Interfaces.C.plain_char;
subtype size_t is Interfaces.C.size_t;
-----------
-- Errno --
-----------
function errno return int;
pragma Import (C, errno, "__get_errno");
EAGAIN : constant := System.Linux.EAGAIN;
EINTR : constant := System.Linux.EINTR;
EINVAL : constant := System.Linux.EINVAL;
ENOMEM : constant := System.Linux.ENOMEM;
EPERM : constant := System.Linux.EPERM;
ETIMEDOUT : constant := System.Linux.ETIMEDOUT;
-------------
-- Signals --
-------------
Max_Interrupt : constant := 31;
type Signal is new int range 0 .. Max_Interrupt;
for Signal'Size use int'Size;
SIGHUP : constant := System.Linux.SIGHUP;
SIGINT : constant := System.Linux.SIGINT;
SIGQUIT : constant := System.Linux.SIGQUIT;
SIGILL : constant := System.Linux.SIGILL;
SIGTRAP : constant := System.Linux.SIGTRAP;
SIGIOT : constant := System.Linux.SIGIOT;
SIGABRT : constant := System.Linux.SIGABRT;
SIGFPE : constant := System.Linux.SIGFPE;
SIGKILL : constant := System.Linux.SIGKILL;
SIGBUS : constant := System.Linux.SIGBUS;
SIGSEGV : constant := System.Linux.SIGSEGV;
SIGPIPE : constant := System.Linux.SIGPIPE;
SIGALRM : constant := System.Linux.SIGALRM;
SIGTERM : constant := System.Linux.SIGTERM;
SIGUSR1 : constant := System.Linux.SIGUSR1;
SIGUSR2 : constant := System.Linux.SIGUSR2;
SIGCLD : constant := System.Linux.SIGCLD;
SIGCHLD : constant := System.Linux.SIGCHLD;
SIGPWR : constant := System.Linux.SIGPWR;
SIGWINCH : constant := System.Linux.SIGWINCH;
SIGURG : constant := System.Linux.SIGURG;
SIGPOLL : constant := System.Linux.SIGPOLL;
SIGIO : constant := System.Linux.SIGIO;
SIGLOST : constant := System.Linux.SIGLOST;
SIGSTOP : constant := System.Linux.SIGSTOP;
SIGTSTP : constant := System.Linux.SIGTSTP;
SIGCONT : constant := System.Linux.SIGCONT;
SIGTTIN : constant := System.Linux.SIGTTIN;
SIGTTOU : constant := System.Linux.SIGTTOU;
SIGVTALRM : constant := System.Linux.SIGVTALRM;
SIGPROF : constant := System.Linux.SIGPROF;
SIGXCPU : constant := System.Linux.SIGXCPU;
SIGXFSZ : constant := System.Linux.SIGXFSZ;
SIGUNUSED : constant := System.Linux.SIGUNUSED;
SIGSTKFLT : constant := System.Linux.SIGSTKFLT;
SIGADAABORT : constant := SIGABRT;
-- Change this to use another signal for task abort. SIGTERM might be a
-- good one.
type Signal_Set is array (Natural range <>) of Signal;
Unmasked : constant Signal_Set := (
SIGTRAP,
-- To enable debugging on multithreaded applications, mark SIGTRAP to
-- be kept unmasked.
SIGBUS,
SIGTTIN, SIGTTOU, SIGTSTP,
-- Keep these three signals unmasked so that background processes and IO
-- behaves as normal "C" applications
SIGPROF,
-- To avoid confusing the profiler
SIGKILL, SIGSTOP);
-- These two signals actually can't be masked (POSIX won't allow it)
Reserved : constant Signal_Set := (SIGVTALRM, SIGUNUSED);
-- Not clear why these two signals are reserved. Perhaps they are not
-- supported by this version of GNU/Linux ???
type sigset_t is private;
function sigaddset (set : access sigset_t; sig : Signal) return int;
pragma Import (C, sigaddset, "_sigaddset");
function sigdelset (set : access sigset_t; sig : Signal) return int;
pragma Import (C, sigdelset, "_sigdelset");
function sigfillset (set : access sigset_t) return int;
pragma Import (C, sigfillset, "_sigfillset");
function sigismember (set : access sigset_t; sig : Signal) return int;
pragma Import (C, sigismember, "_sigismember");
function sigemptyset (set : access sigset_t) return int;
pragma Import (C, sigemptyset, "_sigemptyset");
type union_type_3 is new String (1 .. 116);
type siginfo_t is record
si_signo : int;
si_code : int;
si_errno : int;
X_data : union_type_3;
end record;
pragma Convention (C, siginfo_t);
type struct_sigaction is record
sa_handler : System.Address;
sa_mask : sigset_t;
sa_flags : Interfaces.C.unsigned_long;
sa_restorer : System.Address;
end record;
pragma Convention (C, struct_sigaction);
type struct_sigaction_ptr is access all struct_sigaction;
SA_SIGINFO : constant := System.Linux.SA_SIGINFO;
SA_ONSTACK : constant := System.Linux.SA_ONSTACK;
SA_NODEFER : constant := System.Linux.SA_NODEFER;
SA_RESTART : constant := System.Linux.SA_RESTART;
SIG_BLOCK : constant := 0;
SIG_UNBLOCK : constant := 1;
SIG_SETMASK : constant := 2;
SIG_DFL : constant := 0;
SIG_IGN : constant := 1;
function sigaction
(sig : Signal;
act : struct_sigaction_ptr;
oact : struct_sigaction_ptr) return int;
pragma Import (C, sigaction, "sigaction");
----------
-- Time --
----------
Time_Slice_Supported : constant Boolean := True;
-- Indicates whether time slicing is supported
type timespec is private;
type clockid_t is new int;
function clock_gettime
(clock_id : clockid_t; tp : access timespec) return int;
pragma Import (C, clock_gettime, "clock_gettime");
function clock_getres
(clock_id : clockid_t;
res : access timespec) return int;
pragma Import (C, clock_getres, "clock_getres");
function To_Duration (TS : timespec) return Duration;
pragma Inline (To_Duration);
function To_Timespec (D : Duration) return timespec;
pragma Inline (To_Timespec);
function sysconf (name : int) return long;
pragma Import (C, sysconf);
SC_CLK_TCK : constant := 2;
SC_NPROCESSORS_ONLN : constant := 84;
-------------------------
-- Priority Scheduling --
-------------------------
SCHED_OTHER : constant := 0;
SCHED_FIFO : constant := 1;
SCHED_RR : constant := 2;
function To_Target_Priority
(Prio : System.Any_Priority)
return Interfaces.C.int is (Interfaces.C.int (Prio));
-- Maps System.Any_Priority to a POSIX priority
-------------
-- Process --
-------------
type pid_t is private;
function kill (pid : pid_t; sig : Signal) return int;
pragma Import (C, kill, "kill");
function getpid return pid_t;
pragma Import (C, getpid, "getpid");
-------------
-- Threads --
-------------
type Thread_Body is access
function (arg : System.Address) return System.Address;
pragma Convention (C, Thread_Body);
function Thread_Body_Access is new
Ada.Unchecked_Conversion (System.Address, Thread_Body);
type pthread_t is new unsigned_long;
subtype Thread_Id is pthread_t;
function To_pthread_t is
new Ada.Unchecked_Conversion (unsigned_long, pthread_t);
type pthread_mutex_t is limited private;
type pthread_cond_t is limited private;
type pthread_attr_t is limited private;
type pthread_mutexattr_t is limited private;
type pthread_condattr_t is limited private;
type pthread_key_t is private;
PTHREAD_CREATE_DETACHED : constant := 1;
PTHREAD_SCOPE_PROCESS : constant := 1;
PTHREAD_SCOPE_SYSTEM : constant := 0;
-- Read/Write lock not supported on Android.
subtype pthread_rwlock_t is pthread_mutex_t;
subtype pthread_rwlockattr_t is pthread_mutexattr_t;
-----------
-- Stack --
-----------
type stack_t is record
ss_sp : System.Address;
ss_flags : int;
ss_size : size_t;
end record;
pragma Convention (C, stack_t);
function sigaltstack
(ss : not null access stack_t;
oss : access stack_t) return int;
pragma Import (C, sigaltstack, "sigaltstack");
Alternate_Stack : aliased System.Address;
pragma Import (C, Alternate_Stack, "__gnat_alternate_stack");
-- The alternate signal stack for stack overflows
Alternate_Stack_Size : constant := 16 * 1024;
-- This must be in keeping with init.c:__gnat_alternate_stack
Stack_Base_Available : constant Boolean := False;
-- Indicates whether the stack base is available on this target
function Get_Stack_Base (ignored_thread : pthread_t)
return Address is (Null_Address);
-- This is a dummy procedure to share some GNULLI files
function Get_Page_Size return int;
pragma Import (C, Get_Page_Size, "_getpagesize");
-- Returns the size of a page
PROT_NONE : constant := 0;
PROT_READ : constant := 1;
PROT_WRITE : constant := 2;
PROT_EXEC : constant := 4;
PROT_ALL : constant := PROT_READ + PROT_WRITE + PROT_EXEC;
PROT_ON : constant := PROT_READ;
PROT_OFF : constant := PROT_ALL;
function mprotect (addr : Address; len : size_t; prot : int) return int;
pragma Import (C, mprotect);
---------------------------------------
-- Nonstandard Thread Initialization --
---------------------------------------
procedure pthread_init is null;
-- This is a dummy procedure to share some GNULLI files
-------------------------
-- POSIX.1c Section 3 --
-------------------------
function sigwait (set : access sigset_t; sig : access Signal) return int;
pragma Import (C, sigwait, "sigwait");
function pthread_kill (thread : pthread_t; sig : Signal) return int;
pragma Import (C, pthread_kill, "pthread_kill");
function pthread_sigmask
(how : int;
set : access sigset_t;
oset : access sigset_t) return int;
pragma Import (C, pthread_sigmask, "sigprocmask");
-- pthread_sigmask maybe be broken due to mismatch between sigset_t and
-- kernel_sigset_t, substitute sigprocmask temporarily. ???
-- pragma Import (C, pthread_sigmask, "pthread_sigmask");
--------------------------
-- POSIX.1c Section 11 --
--------------------------
function pthread_mutexattr_init
(attr : access pthread_mutexattr_t) return int;
pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
function pthread_mutexattr_destroy
(attr : access pthread_mutexattr_t) return int;
pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
function pthread_mutex_init
(mutex : access pthread_mutex_t;
attr : access pthread_mutexattr_t) return int;
pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
function pthread_condattr_init
(attr : access pthread_condattr_t) return int;
pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
function pthread_condattr_destroy
(attr : access pthread_condattr_t) return int;
pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
function pthread_cond_init
(cond : access pthread_cond_t;
attr : access pthread_condattr_t) return int;
pragma Import (C, pthread_cond_init, "pthread_cond_init");
function pthread_cond_destroy (cond : access pthread_cond_t) return int;
pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
function pthread_cond_signal (cond : access pthread_cond_t) return int;
pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
function pthread_cond_wait
(cond : access pthread_cond_t;
mutex : access pthread_mutex_t) return int;
pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
function pthread_cond_timedwait
(cond : access pthread_cond_t;
mutex : access pthread_mutex_t;
abstime : access timespec) return int;
pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
--------------------------
-- POSIX.1c Section 13 --
--------------------------
PTHREAD_PRIO_PROTECT : constant := 0;
PTHREAD_PRIO_INHERIT : constant := 1;
function pthread_mutexattr_setprotocol
(ignored_attr : access pthread_mutexattr_t;
ignored_protocol : int) return int is (0);
function pthread_mutexattr_setprioceiling
(ignored_attr : access pthread_mutexattr_t;
ignored_prioceiling : int) return int is (0);
type struct_sched_param is record
sched_priority : int; -- scheduling priority
end record;
pragma Convention (C, struct_sched_param);
function pthread_setschedparam
(thread : pthread_t;
policy : int;
param : access struct_sched_param) return int;
pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
function pthread_attr_setscope
(attr : access pthread_attr_t;
scope : int) return int;
pragma Import (C, pthread_attr_setscope, "pthread_attr_setscope");
function pthread_attr_setschedpolicy
(attr : access pthread_attr_t;
policy : int) return int;
pragma Import
(C, pthread_attr_setschedpolicy, "pthread_attr_setschedpolicy");
function sched_yield return int;
pragma Import (C, sched_yield, "sched_yield");
---------------------------
-- P1003.1c - Section 16 --
---------------------------
function pthread_attr_init
(attributes : access pthread_attr_t) return int;
pragma Import (C, pthread_attr_init, "pthread_attr_init");
function pthread_attr_destroy
(attributes : access pthread_attr_t) return int;
pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
function pthread_attr_setdetachstate
(attr : access pthread_attr_t;
detachstate : int) return int;
pragma Import
(C, pthread_attr_setdetachstate, "pthread_attr_setdetachstate");
function pthread_attr_setstacksize
(attr : access pthread_attr_t;
stacksize : size_t) return int;
pragma Import (C, pthread_attr_setstacksize, "pthread_attr_setstacksize");
function pthread_create
(thread : access pthread_t;
attributes : access pthread_attr_t;
start_routine : Thread_Body;
arg : System.Address) return int;
pragma Import (C, pthread_create, "pthread_create");
procedure pthread_exit (status : System.Address);
pragma Import (C, pthread_exit, "pthread_exit");
function pthread_self return pthread_t;
pragma Import (C, pthread_self, "pthread_self");
function lwp_self return System.Address;
pragma Import (C, lwp_self, "__gnat_lwp_self");
--------------------------
-- POSIX.1c Section 17 --
--------------------------
function pthread_setspecific
(key : pthread_key_t;
value : System.Address) return int;
pragma Import (C, pthread_setspecific, "pthread_setspecific");
function pthread_getspecific (key : pthread_key_t) return System.Address;
pragma Import (C, pthread_getspecific, "pthread_getspecific");
type destructor_pointer is access procedure (arg : System.Address);
pragma Convention (C, destructor_pointer);
function pthread_key_create
(key : access pthread_key_t;
destructor : destructor_pointer) return int;
pragma Import (C, pthread_key_create, "pthread_key_create");
CPU_SETSIZE : constant := 1_024;
-- Size of the cpu_set_t mask on most linux systems (SUSE 11 uses 4_096).
-- This is kept for backward compatibility (System.Task_Info uses it), but
-- the run-time library does no longer rely on static masks, using
-- dynamically allocated masks instead.
type bit_field is array (1 .. CPU_SETSIZE) of Boolean;
for bit_field'Size use CPU_SETSIZE;
pragma Pack (bit_field);
pragma Convention (C, bit_field);
type cpu_set_t is record
bits : bit_field;
end record;
pragma Convention (C, cpu_set_t);
type cpu_set_t_ptr is access all cpu_set_t;
-- In the run-time library we use this pointer because the size of type
-- cpu_set_t varies depending on the glibc version. Hence, objects of type
-- cpu_set_t are allocated dynamically using the number of processors
-- available in the target machine (value obtained at execution time).
function CPU_ALLOC (count : size_t) return cpu_set_t_ptr;
pragma Import (C, CPU_ALLOC, "__gnat_cpu_alloc");
-- Wrapper around the CPU_ALLOC C macro
function CPU_ALLOC_SIZE (count : size_t) return size_t;
pragma Import (C, CPU_ALLOC_SIZE, "__gnat_cpu_alloc_size");
-- Wrapper around the CPU_ALLOC_SIZE C macro
procedure CPU_FREE (cpuset : cpu_set_t_ptr);
pragma Import (C, CPU_FREE, "__gnat_cpu_free");
-- Wrapper around the CPU_FREE C macro
procedure CPU_ZERO (count : size_t; cpuset : cpu_set_t_ptr);
pragma Import (C, CPU_ZERO, "__gnat_cpu_zero");
-- Wrapper around the CPU_ZERO_S C macro
procedure CPU_SET (cpu : int; count : size_t; cpuset : cpu_set_t_ptr);
pragma Import (C, CPU_SET, "__gnat_cpu_set");
-- Wrapper around the CPU_SET_S C macro
function pthread_setaffinity_np
(thread : pthread_t;
cpusetsize : size_t;
cpuset : cpu_set_t_ptr) return int;
pragma Import (C, pthread_setaffinity_np, "pthread_setaffinity_np");
pragma Weak_External (pthread_setaffinity_np);
-- Use a weak symbol because this function may be available or not,
-- depending on the version of the system.
function pthread_attr_setaffinity_np
(attr : access pthread_attr_t;
cpusetsize : size_t;
cpuset : cpu_set_t_ptr) return int;
pragma Import (C, pthread_attr_setaffinity_np,
"pthread_attr_setaffinity_np");
pragma Weak_External (pthread_attr_setaffinity_np);
-- Use a weak symbol because this function may be available or not,
-- depending on the version of the system.
private
type sigset_t is new Interfaces.C.unsigned_long;
pragma Convention (C, sigset_t);
for sigset_t'Alignment use Interfaces.C.unsigned_long'Alignment;
pragma Warnings (Off);
for struct_sigaction use record
sa_handler at Linux.sa_handler_pos range 0 .. Standard'Address_Size - 1;
sa_mask at Linux.sa_mask_pos range 0 .. sigset_t'Size - 1;
sa_flags at Linux.sa_flags_pos
range 0 .. Interfaces.C.unsigned_long'Size - 1;
end record;
-- We intentionally leave sa_restorer unspecified and let the compiler
-- append it after the last field, so disable corresponding warning.
pragma Warnings (On);
type pid_t is new int;
type time_t is range -2 ** (System.Parameters.time_t_bits - 1)
.. 2 ** (System.Parameters.time_t_bits - 1) - 1;
type timespec is record
tv_sec : time_t;
tv_nsec : long;
end record;
pragma Convention (C, timespec);
type unsigned_long_long_t is mod 2 ** 64;
-- Local type only used to get the alignment of this type below
subtype char_array is Interfaces.C.char_array;
type pthread_attr_t is record
Data : char_array (1 .. OS_Constants.PTHREAD_ATTR_SIZE);
end record;
pragma Convention (C, pthread_attr_t);
for pthread_attr_t'Alignment use Interfaces.C.unsigned_long'Alignment;
type pthread_condattr_t is record
Data : char_array (1 .. OS_Constants.PTHREAD_CONDATTR_SIZE);
end record;
pragma Convention (C, pthread_condattr_t);
for pthread_condattr_t'Alignment use Interfaces.C.int'Alignment;
type pthread_mutexattr_t is record
Data : char_array (1 .. OS_Constants.PTHREAD_MUTEXATTR_SIZE);
end record;
pragma Convention (C, pthread_mutexattr_t);
for pthread_mutexattr_t'Alignment use Interfaces.C.int'Alignment;
type pthread_mutex_t is record
Data : char_array (1 .. OS_Constants.PTHREAD_MUTEX_SIZE);
end record;
pragma Convention (C, pthread_mutex_t);
for pthread_mutex_t'Alignment use Interfaces.C.unsigned_long'Alignment;
type pthread_cond_t is record
Data : char_array (1 .. OS_Constants.PTHREAD_COND_SIZE);
end record;
pragma Convention (C, pthread_cond_t);
for pthread_cond_t'Alignment use unsigned_long_long_t'Alignment;
type pthread_key_t is new unsigned;
end System.OS_Interface;