2 * Copyright (C) 2001 Jason Evans <jasone@freebsd.org>.
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31 * Test thread stack guard functionality.
42 #define FRAME_SIZE 1024
43 #define FRAME_OVERHEAD 40
47 void *top; /* Top of thread's initial stack frame. */
48 int cur; /* Recursion depth. */
49 int max; /* Maximum recursion depth. */
56 struct args *parms = (struct args *)args;
57 char filler[FRAME_SIZE - FRAME_OVERHEAD];
59 /* Touch the memory in this stack frame. */
61 memset(filler, 0xa5, sizeof(filler));
63 if (parms->top == NULL) {
64 /* Initial stack frame. */
65 parms->top = (void*)⊤
69 * Make sure frame size is what we expect. Getting this right involves
70 * hand tweaking, so just print a warning rather than aborting.
72 if (parms->top - (void *)&top != FRAME_SIZE * parms->cur) {
73 fprintf(stderr, "Stack size (%d) != expected (%d), frame %d\n",
74 (int)(parms->top - (void *)&top), FRAME_SIZE * parms->cur,
79 if (parms->cur < parms->max)
87 main(int argc, char **argv)
89 size_t def_stacksize, def_guardsize;
90 size_t stacksize, guardsize;
96 fprintf(stderr, "usage: guard_b <stacksize> <guardsize>\n");
99 fprintf(stderr, "Test begin\n");
101 stacksize = strtoul(argv[1], NULL, 10);
102 guardsize = strtoul(argv[2], NULL, 10);
104 assert(pthread_attr_init(&attr) == 0);
106 * Exercise the attribute APIs more thoroughly than is strictly
107 * necessary for the meat of this test program.
109 assert(pthread_attr_getstacksize(&attr, &def_stacksize) == 0);
110 assert(pthread_attr_getguardsize(&attr, &def_guardsize) == 0);
111 if (def_stacksize != stacksize) {
112 assert(pthread_attr_setstacksize(&attr, stacksize) == 0);
113 assert(pthread_attr_getstacksize(&attr, &def_stacksize) == 0);
114 assert(def_stacksize == stacksize);
116 if (def_guardsize != guardsize) {
117 assert(pthread_attr_setguardsize(&attr, guardsize) == 0);
118 assert(pthread_attr_getguardsize(&attr, &def_guardsize) == 0);
119 assert(def_guardsize >= guardsize);
123 * Create a thread that will come just short of overflowing the thread
124 * stack. We need to leave a bit of breathing room in case the thread
125 * is context switched, and we also have to take care not to call any
126 * functions in the deepest stack frame.
130 args.max = (stacksize / FRAME_SIZE) - 1;
131 fprintf(stderr, "No overflow:\n");
132 assert(pthread_create(&thread, &attr, recurse, &args) == 0);
133 assert(pthread_join(thread, NULL) == 0);
136 * Create a thread that will barely of overflow the thread stack. This
137 * should cause a segfault.
141 args.max = (stacksize / FRAME_SIZE) + 1;
142 fprintf(stderr, "Overflow:\n");
143 assert(pthread_create(&thread, &attr, recurse, &args) == 0);
144 assert(pthread_join(thread, NULL) == 0);
147 fprintf(stderr, "Unexpected success\n");