diff --git a/programs/develop/ktcc/trunk/bin/lib/libc.def b/programs/develop/ktcc/trunk/bin/lib/libc.def
index 37549fcf3..f3896503a 100644
--- a/programs/develop/ktcc/trunk/bin/lib/libc.def
+++ b/programs/develop/ktcc/trunk/bin/lib/libc.def
@@ -47,11 +47,13 @@ vsscanf
 ungetc
 ;____STDLIB____
 abs
+abort
 atoi
 atol
 atoll
 atof
 calloc
+_exit
 exit
 free
 itoa
diff --git a/programs/develop/ktcc/trunk/libc.obj/.gitignore b/programs/develop/ktcc/trunk/libc.obj/.gitignore
new file mode 100644
index 000000000..8211fe2bd
--- /dev/null
+++ b/programs/develop/ktcc/trunk/libc.obj/.gitignore
@@ -0,0 +1,4 @@
+.tup
+*.o
+*.obj
+*.kex
\ No newline at end of file
diff --git a/programs/develop/ktcc/trunk/libc.obj/include/stdlib.h b/programs/develop/ktcc/trunk/libc.obj/include/stdlib.h
index bd868f070..4863dcb45 100644
--- a/programs/develop/ktcc/trunk/libc.obj/include/stdlib.h
+++ b/programs/develop/ktcc/trunk/libc.obj/include/stdlib.h
@@ -48,7 +48,13 @@ DLLAPI void free(void* ptr);
 
 DLLAPI long int strtol(const char* str, char** endptr, int base);
 
+DLLAPI void _exit(int status);
+#ifndef _Exit
+#define _Exit(status) _exit(status);
+#endif
+
 DLLAPI void exit(int status);
+DLLAPI void abort();
 
 DLLAPI void srand(unsigned s);
 DLLAPI int rand(void);
diff --git a/programs/develop/ktcc/trunk/libc.obj/samples/Makefile b/programs/develop/ktcc/trunk/libc.obj/samples/Makefile
index 49725be3d..020298237 100644
--- a/programs/develop/ktcc/trunk/libc.obj/samples/Makefile
+++ b/programs/develop/ktcc/trunk/libc.obj/samples/Makefile
@@ -27,7 +27,8 @@ BIN = \
 	libc_test.kex \
 	pipe.kex \
 	defgen.kex \
-	futex.kex
+	futex.kex \
+	atexit_test.kex
 	
 all: $(BIN)
 	
diff --git a/programs/develop/ktcc/trunk/libc.obj/samples/atexit_test.c b/programs/develop/ktcc/trunk/libc.obj/samples/atexit_test.c
new file mode 100644
index 000000000..3bf8609d0
--- /dev/null
+++ b/programs/develop/ktcc/trunk/libc.obj/samples/atexit_test.c
@@ -0,0 +1,18 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+void f()
+{
+    static int c = 1;
+    printf("exit #%d\n", c);
+    c++;
+}
+
+int main()
+{
+    atexit(&f);
+    atexit(&f);
+    atexit(&f);
+
+    return 0;
+}
diff --git a/programs/develop/ktcc/trunk/libc.obj/samples/build_all.sh b/programs/develop/ktcc/trunk/libc.obj/samples/build_all.sh
index fb6e57cf7..4a75e9da9 100644
--- a/programs/develop/ktcc/trunk/libc.obj/samples/build_all.sh
+++ b/programs/develop/ktcc/trunk/libc.obj/samples/build_all.sh
@@ -23,5 +23,6 @@ cp     clayer/logo.png /tmp0/1/tcc_samples/logo.png
 ../tcc defgen.c -o /tmp0/1/tcc_samples/defgen
 ../tcc pipe.c -o /tmp0/1/tcc_samples/pipe
 ../tcc futex.c -o /tmp0/1/tcc_samples/futex
+../tcc atexit_test.c -o /tmp0/1/tcc_samples/atexit_test
 "/sys/File managers/Eolite" /tmp0/1/tcc_samples
 exit
diff --git a/programs/develop/ktcc/trunk/libc.obj/source/crt/crt0.asm b/programs/develop/ktcc/trunk/libc.obj/source/crt/crt0.asm
index 596fba564..ecfa9f00c 100644
--- a/programs/develop/ktcc/trunk/libc.obj/source/crt/crt0.asm
+++ b/programs/develop/ktcc/trunk/libc.obj/source/crt/crt0.asm
@@ -14,6 +14,7 @@ public start
 public start as '_start'
 
 extrn main
+extrn exit
 
 include '../../../../../../proc32.inc'
 include '../../../../../../macros.inc'
@@ -38,36 +39,36 @@ start:
     call push_param
 ; retrieving parameters
     mov  esi, params
-    xor  edx, edx  ; dl - идёт параметр(1) или разделители(0)
-                   ; dh - символ с которого начался параметр (1 кавычки, 0 остальное)
+    xor  edx, edx  ; dl - is it a parameter (1) or delimiters (0)
+                   ; dh - character with which the parameter started (1 quotes, 0 everything else)
     mov  ecx, 1    ; cl = 1
-                   ; ch = 0  просто ноль
+                   ; ch = 0  just zero
 .parse: 
     lodsb
     test al, al
     jz   .run
     test dl, dl
     jnz  .findendparam
-                     ;{если был разделитель
+                     ;{if it was a delimiter
     cmp  al, ' '
-    jz   .parse  ;загружен пробел, грузим следующий символ
-    mov  dl, cl  ;начинается параметр
+    jz   .parse  ; space loaded, load next character
+    mov  dl, cl  ; parameter starts
     cmp  al, '"'
-    jz   @f      ;загружены кавычки
-    mov  dh, ch     ;параметр без кавычек
+    jz   @f      ; quotes loaded
+    mov  dh, ch  ; parameter without quotes
     dec  esi
     call push_param
     inc  esi
     jmp  .parse
 
   @@:  
-    mov  dh, cl     ;параметр в кавычеках
-    call push_param ;если не пробел значит начинается какой то параметр
-    jmp  .parse     ;если был разделитель}
+    mov  dh, cl     ; parameter in quotes
+    call push_param ; if not a space, then some parameter starts
+    jmp  .parse     ; if it was a delimiter}
 
 .findendparam:
     test dh, dh
-    jz   @f ; без кавычек
+    jz   @f ; without quotes
     cmp  al, '"'
     jz   .clear
     jmp  .parse
@@ -86,10 +87,9 @@ start:
     push [argc]
     call main
 .exit:
-    xor  eax,eax
-    dec  eax
-    int  0x40
-    dd   -1
+    push eax
+    call dword [exit]
+    dd -1
 .crash:
     jmp  .exit
 ;============================
diff --git a/programs/develop/ktcc/trunk/libc.obj/source/libc.c b/programs/develop/ktcc/trunk/libc.obj/source/libc.c
index 5f1123eca..c269045b5 100644
--- a/programs/develop/ktcc/trunk/libc.obj/source/libc.c
+++ b/programs/develop/ktcc/trunk/libc.obj/source/libc.c
@@ -82,6 +82,7 @@
 #include "string/strstr.c"
 #include "string/strtok.c"
 #include "string/strxfrm.c"
+
 #include "stdlib/abs.c"
 #include "stdlib/assert.c"
 #include "stdlib/atof.c"
@@ -89,7 +90,9 @@
 #include "stdlib/atol.c"
 #include "stdlib/atoll.c"
 #include "stdlib/calloc.c"
+#include "stdlib/atexit.c"
 #include "stdlib/exit.c"
+#include "stdlib/_exit.c"
 #include "stdlib/free.c"
 #include "stdlib/itoa.c"
 #include "stdlib/labs.c"
@@ -100,6 +103,7 @@
 #include "stdlib/realloc.c"
 #include "stdlib/strtod.c"
 #include "stdlib/strtol.c"
+#include "stdlib/abort.c"
 
 #include "math/acosh.c"
 #include "math/asinh.c"
@@ -170,7 +174,9 @@ ksys_dll_t EXPORTS[] = {
     { "atoll", &atoll },
     { "atof", &atof },
     { "calloc", &calloc },
+    { "_exit", &_exit },
     { "exit", &exit },
+    { "abort", &abort },
     { "free", &free },
     { "itoa", &itoa },
     { "labs", &labs },
diff --git a/programs/develop/ktcc/trunk/libc.obj/source/stdlib/_exit.c b/programs/develop/ktcc/trunk/libc.obj/source/stdlib/_exit.c
new file mode 100644
index 000000000..5382cc62f
--- /dev/null
+++ b/programs/develop/ktcc/trunk/libc.obj/source/stdlib/_exit.c
@@ -0,0 +1,26 @@
+#include <conio.h>
+#include <stdio.h>
+#include <sys/ksys.h>
+
+void _exit(int status)
+{
+    __libc_exit(status, NULL);
+}
+
+void __libc_exit(int status, void (*before_exit)(int status))
+{
+    // return error and this is not abort
+    if (status && status != 128) {
+        fprintf(stderr, "\nexit code: %d\n", status);
+    }
+    
+    if (before_exit) {
+        before_exit(status);
+    }
+
+    if (__con_is_load) {
+        con_exit(0);
+    }
+
+    _ksys_exit();
+}
diff --git a/programs/develop/ktcc/trunk/libc.obj/source/stdlib/abort.c b/programs/develop/ktcc/trunk/libc.obj/source/stdlib/abort.c
new file mode 100644
index 000000000..a494f357f
--- /dev/null
+++ b/programs/develop/ktcc/trunk/libc.obj/source/stdlib/abort.c
@@ -0,0 +1,17 @@
+/*
+* SPDX-License-Identifier: GPL-2.0-only
+* Copyright (C) 2026 KolibriOS team
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/ksys.h>
+
+void abort()
+{
+    ksys_thread_t t;
+    _ksys_thread_info(&t, -1);
+    fprintf(stderr, "\nAbort in %d\n", t.pid);
+
+    _exit(128);
+}
diff --git a/programs/develop/ktcc/trunk/libc.obj/source/stdlib/atexit.c b/programs/develop/ktcc/trunk/libc.obj/source/stdlib/atexit.c
new file mode 100644
index 000000000..89c2a6682
--- /dev/null
+++ b/programs/develop/ktcc/trunk/libc.obj/source/stdlib/atexit.c
@@ -0,0 +1,40 @@
+/*
+* SPDX-License-Identifier: GPL-2.0-only
+* Copyright (C) 2026 KolibriOS team
+*/
+
+#include <stdlib.h>
+
+struct atexit_n {
+    struct atexit_n* last;
+    void (*func)(void);
+};
+
+static struct atexit_n* __last_n = NULL;
+
+int atexit(void (*func)(void))
+{
+    struct atexit_n* n = malloc(sizeof(struct atexit_n));
+
+    if (n == NULL) {
+        return 1;
+    }
+
+    n->last = __last_n;
+    n->func = func;
+
+    __last_n = n;
+
+    return 0;
+}
+
+void __run_atexit()
+{
+    struct atexit_n* n = __last_n;
+    while (n != NULL) {
+        n->func();
+        struct atexit_n* to_free = n;
+        n = n->last;
+        free(to_free);
+    }
+}
diff --git a/programs/develop/ktcc/trunk/libc.obj/source/stdlib/exit.c b/programs/develop/ktcc/trunk/libc.obj/source/stdlib/exit.c
index 1e3bebdc0..f23ff7433 100644
--- a/programs/develop/ktcc/trunk/libc.obj/source/stdlib/exit.c
+++ b/programs/develop/ktcc/trunk/libc.obj/source/stdlib/exit.c
@@ -1,12 +1,32 @@
-/* Copyright (C) 2021 Logaev Maxim (turbocat2001), GPLv2 */
+/*
+* SPDX-License-Identifier: GPL-2.0-only
+* Copyright (C) 2021 Logaev Maxim
+* Copyright (C) 2026 KolibriOS team
+*/
 
-#include <conio.h>
+#include <stdlib.h>
 #include <sys/ksys.h>
+#include "_exit.h"
+
+/*
+TODO
+static void __close_all()
+{
+}
+
+static void __free_all_mem()
+{
+}
+*/
+
+void __normal_exit(int status)
+{
+    __run_atexit();
+    __close_all();
+    __free_all_mem();
+}
 
 void exit(int status)
 {
-    if (__con_is_load) {
-        con_exit(status);
-    }
-    _ksys_exit();
+    __libc_exit(status, &__normal_exit);
 }