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57 lines
1.3 KiB
Plaintext
57 lines
1.3 KiB
Plaintext
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dnl #
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dnl # Check if the glibc NPTL threading implementation includes the guard area
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dnl # within the stack size allocation, rather than allocating extra space at
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dnl # the end of the stack, as POSIX.1 requires.
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dnl #
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AC_DEFUN([ZFS_AC_CONFIG_USER_STACK_GUARD], [
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AC_MSG_CHECKING([whether pthread stack includes guard])
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saved_CFLAGS="$CFLAGS"
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CFLAGS="-fstack-check"
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saved_LDFLAGS="$LDFLAGS"
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LDFLAGS="-lpthread"
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AC_RUN_IFELSE(AC_LANG_PROGRAM(
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[
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#include <pthread.h>
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#include <sys/resource.h>
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#include <unistd.h>
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#include <bits/local_lim.h>
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#define PAGESIZE (sysconf(_SC_PAGESIZE))
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#define STACK_SIZE 8192
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#define BUFSIZE 4096
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void * func(void *arg)
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{
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char buf[[[BUFSIZE]]];
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}
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],
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[
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pthread_t tid;
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pthread_attr_t attr;
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struct rlimit l;
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l.rlim_cur = 0;
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l.rlim_max = 0;
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setrlimit(RLIMIT_CORE, &l);
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pthread_attr_init(&attr);
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pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN + STACK_SIZE);
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pthread_attr_setguardsize(&attr, PAGESIZE);
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pthread_create(&tid, &attr, func, NULL);
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pthread_join(tid, NULL);
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]),
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[
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AC_MSG_RESULT([no])
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],
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[
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AC_DEFINE([NPTL_GUARD_WITHIN_STACK], 1,
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[Define to 1 if NPTL threading implementation includes
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guard area in stack allocation])
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AC_MSG_RESULT([yes])
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])
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CFLAGS="$saved_CFLAGS"
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LDFLAGS="$saved_LDFLAGS"
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])
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