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socket: Fix tst-cmsghdr-skeleton.c use of cmsg_len
cmsg_len is supposed to be socklen_t according to standards, but it was made size_t on Linux, see BZ 16919. For ports that have it socklen_t, SIZE_MAX is too large. We can however explicitly cast it to the type of cmsg_len so it will fit according to that type.
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@ -49,7 +49,7 @@ RUN_TEST_FUNCNAME (CMSG_NXTHDR_IMPL) (void)
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/* The first header length is so big, using it would cause an overflow. */
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cmsg = CMSG_FIRSTHDR (&m);
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TEST_VERIFY_EXIT ((char *) cmsg == cmsgbuf);
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cmsg->cmsg_len = SIZE_MAX;
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cmsg->cmsg_len = (__typeof (cmsg->cmsg_len)) SIZE_MAX;
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cmsg = CMSG_NXTHDR_IMPL (&m, cmsg);
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TEST_VERIFY_EXIT (cmsg == NULL);
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