Bug #14387 » 0001-thread_pthread.c-make-get_main_stack-portable-on-lin.patch
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# define MAINSTACKADDR_AVAILABLE 0
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# endif
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#endif
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#if MAINSTACKADDR_AVAILABLE && !defined(get_main_stack)
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# define get_main_stack(addr, size) get_stack(addr, size)
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#endif
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#ifdef STACKADDR_AVAILABLE
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/*
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| ... | ... | |
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return 0;
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#undef CHECK_ERR
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}
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#if defined(__linux__) && !defined(__GLIBC__) && defined(HAVE_GETRLIMIT)
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#ifndef PAGE_SIZE
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#include <unistd.h>
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#define PAGE_SIZE sysconf(_SC_PAGE_SIZE)
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#endif
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static int
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get_main_stack(void **addr, size_t *size)
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{
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size_t start, end, limit, prevend = 0;
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struct rlimit r;
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FILE *f;
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char buf[PATH_MAX+80], s[8];
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int n;
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STACK_GROW_DIR_DETECTION;
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f = fopen("/proc/self/maps", "re");
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if (!f)
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return -1;
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n = 0;
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while (fgets(buf, sizeof buf, f)) {
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n = sscanf(buf, "%zx-%zx %*s %*s %*s %*s %7s", &start, &end, s);
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if (n >= 2) {
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if (n == 3 && strcmp(s, "[stack]") == 0)
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break;
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prevend = end;
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}
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n = 0;
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}
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fclose(f);
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if (n == 0)
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return -1;
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limit = 100 << 20; /* 100MB stack limit */
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if (getrlimit(RLIMIT_STACK, &r)==0 && r.rlim_cur < limit)
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limit = r.rlim_cur & -PAGE_SIZE;
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if (limit > end) limit = end;
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if (prevend < end - limit) prevend = end - limit;
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if (start > prevend) start = prevend;
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*addr = IS_STACK_DIR_UPPER() ? (void *)start : (void *)end;
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*size = end - start;
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return 0;
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}
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#else
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# define get_main_stack(addr, size) get_stack(addr, size)
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#endif
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#endif
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static struct {
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