1 | /* Check multiple makecontext calls. |
2 | Copyright (C) 2018-2022 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <stdio.h> |
20 | #include <stdlib.h> |
21 | #include <ucontext.h> |
22 | |
23 | static ucontext_t uctx_main, uctx_func1, uctx_func2; |
24 | const char *str1 = "\e[31mswapcontext(&uctx_func1, &uctx_main)\e[0m" ; |
25 | const char *str2 = "\e[34mswapcontext(&uctx_func2, &uctx_main)\e[0m" ; |
26 | const char *fmt1 = "\e[31m" ; |
27 | const char *fmt2 = "\e[34m" ; |
28 | |
29 | #define handle_error(msg) \ |
30 | do { perror(msg); exit(EXIT_FAILURE); } while (0) |
31 | |
32 | __attribute__((noinline, noclone)) |
33 | static void |
34 | func4(ucontext_t *uocp, ucontext_t *ucp, const char *str, const char *fmt) |
35 | { |
36 | printf(format: " %sfunc4: %s\e[0m\n" , fmt, str); |
37 | if (swapcontext(oucp: uocp, ucp: ucp) == -1) |
38 | handle_error("swapcontext" ); |
39 | printf(format: " %sfunc4: returning\e[0m\n" , fmt); |
40 | } |
41 | |
42 | __attribute__((noinline, noclone)) |
43 | static void |
44 | func3(ucontext_t *uocp, ucontext_t *ucp, const char *str, const char *fmt) |
45 | { |
46 | printf(format: " %sfunc3: func4(uocp, ucp, str)\e[0m\n" , fmt); |
47 | func4(uocp, ucp, str, fmt); |
48 | printf(format: " %sfunc3: returning\e[0m\n" , fmt); |
49 | } |
50 | |
51 | __attribute__((noinline, noclone)) |
52 | static void |
53 | func1(void) |
54 | { |
55 | while ( 1 ) |
56 | { |
57 | printf(format: " \e[31mfunc1: func3(&uctx_func1, &uctx_main, str1)\e[0m\n" ); |
58 | func3( uocp: &uctx_func1, ucp: &uctx_main, str: str1, fmt: fmt1); |
59 | } |
60 | } |
61 | |
62 | __attribute__((noinline, noclone)) |
63 | static void |
64 | func2(void) |
65 | { |
66 | while ( 1 ) |
67 | { |
68 | printf(format: " \e[34mfunc2: func3(&uctx_func2, &uctx_main, str2)\e[0m\n" ); |
69 | func3(uocp: &uctx_func2, ucp: &uctx_main, str: str2, fmt: fmt2); |
70 | } |
71 | } |
72 | |
73 | static int |
74 | do_test (void) |
75 | { |
76 | char func1_stack[16384]; |
77 | char func2_stack[16384]; |
78 | int i; |
79 | |
80 | if (getcontext(ucp: &uctx_func1) == -1) |
81 | handle_error("getcontext" ); |
82 | uctx_func1.uc_stack.ss_sp = func1_stack; |
83 | uctx_func1.uc_stack.ss_size = sizeof (func1_stack); |
84 | uctx_func1.uc_link = &uctx_main; |
85 | makecontext(ucp: &uctx_func1, func: func1, argc: 0); |
86 | |
87 | if (getcontext(ucp: &uctx_func2) == -1) |
88 | handle_error("getcontext" ); |
89 | uctx_func2.uc_stack.ss_sp = func2_stack; |
90 | uctx_func2.uc_stack.ss_size = sizeof (func2_stack); |
91 | uctx_func2.uc_link = &uctx_func1; |
92 | makecontext(ucp: &uctx_func2, func: func2, argc: 0); |
93 | |
94 | for ( i = 0; i < 4; i++ ) |
95 | { |
96 | if (swapcontext(oucp: &uctx_main, ucp: &uctx_func1) == -1) |
97 | handle_error("swapcontext" ); |
98 | printf(format: " \e[35mmain: swapcontext(&uctx_main, &uctx_func2)\n\e[0m" ); |
99 | if (swapcontext(oucp: &uctx_main, ucp: &uctx_func2) == -1) |
100 | handle_error("swapcontext" ); |
101 | printf(format: " \e[35mmain: swapcontext(&uctx_main, &uctx_func1)\n\e[0m" ); |
102 | } |
103 | |
104 | printf(format: "main: exiting\n" ); |
105 | exit(EXIT_SUCCESS); |
106 | } |
107 | |
108 | #include <support/test-driver.c> |
109 | |