Suppress integer-overflow compiler warning for inconsistent sun_len.
On AIX 7.1, struct sockaddr_un is declared to be 1025 bytes long, but the sun_len field that should hold the length is only a byte. Clamp the value we try to store to ensure it will fit in the field. (This coding might need adjustment if there are any machines out there where sun_len is as wide as size_t; but a preliminary survey suggests there's not, so let's keep it simple.) Discussion: https://postgr.es/m/2781112.1644819528@sss.pgh.pa.us
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@ -232,8 +232,18 @@ getaddrinfo_unix(const char *path, const struct addrinfo *hintsp,
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aip->ai_addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(path);
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}
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/*
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* The standard recommendation for filling sun_len is to set it to the
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* struct size (independently of the actual path length). However, that
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* draws an integer-overflow warning on AIX 7.1, where sun_len is just
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* uint8 yet the struct size exceeds 255 bytes. It's likely that nothing
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* is paying attention to sun_len on that platform, but we have to do
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* something with it. To suppress the warning, clamp the struct size to
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* what will fit in sun_len.
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*/
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#ifdef HAVE_STRUCT_SOCKADDR_STORAGE_SS_LEN
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unp->sun_len = sizeof(struct sockaddr_un);
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unp->sun_len = Min(sizeof(struct sockaddr_un),
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((size_t) 1 << (sizeof(unp->sun_len) * BITS_PER_BYTE)) - 1);
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#endif
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return 0;
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