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socket: Use may_alias on sockaddr structs (bug 19622)
This supports common coding patterns. The GCC C front end before version 7 rejects the may_alias attribute on a struct definition if it was not present in a previous forward declaration, so this attribute can only be conditionally applied. This implements the spirit of the change in Austin Group issue 1641. Suggested-by: Marek Polacek <polacek@redhat.com> Suggested-by: Jakub Jelinek <jakub@redhat.com> Reviewed-by: Sam James <sam@gentoo.org> Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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@ -149,7 +149,7 @@ enum __socket_type
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#include <bits/sockaddr.h>
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/* Structure describing a generic socket address. */
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struct sockaddr
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struct __attribute_struct_may_alias__ sockaddr
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{
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__SOCKADDR_COMMON (sa_); /* Common data: address family and length. */
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char sa_data[14]; /* Address data. */
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@ -166,7 +166,7 @@ struct sockaddr
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#define _SS_PADSIZE \
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(_SS_SIZE - __SOCKADDR_COMMON_SIZE - sizeof (__ss_aligntype))
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struct sockaddr_storage
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struct __attribute_struct_may_alias__ sockaddr_storage
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{
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__SOCKADDR_COMMON (ss_); /* Address family, etc. */
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char __ss_padding[_SS_PADSIZE];
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@ -244,7 +244,7 @@ extern const struct in6_addr in6addr_loopback; /* ::1 */
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/* Structure describing an Internet socket address. */
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struct sockaddr_in
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struct __attribute_struct_may_alias__ sockaddr_in
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{
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__SOCKADDR_COMMON (sin_);
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in_port_t sin_port; /* Port number. */
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@ -257,9 +257,11 @@ struct sockaddr_in
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- sizeof (struct in_addr)];
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};
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#if !__USE_KERNEL_IPV6_DEFS
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#if __USE_KERNEL_IPV6_DEFS
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struct __attribute_struct_may_alias__ sockaddr_in6;
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#else
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/* Ditto, for IPv6. */
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struct sockaddr_in6
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struct __attribute_struct_may_alias__ sockaddr_in6
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{
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__SOCKADDR_COMMON (sin6_);
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in_port_t sin6_port; /* Transport layer port # */
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@ -874,4 +874,13 @@ _Static_assert (0, "IEEE 128-bits long double requires redirection on this platf
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# define __attribute_returns_twice__ /* Ignore. */
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#endif
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/* Mark struct types as aliasable. Restricted to compilers that
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support forward declarations of structs in the presence of the
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attribute. */
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#if __GNUC_PREREQ (7, 1) || defined __clang__
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# define __attribute_struct_may_alias__ __attribute__ ((__may_alias__))
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#else
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# define __attribute_struct_may_alias__
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#endif
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#endif /* sys/cdefs.h */
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@ -26,7 +26,7 @@
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__BEGIN_DECLS
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/* Structure describing the address of an AF_LOCAL (aka AF_UNIX) socket. */
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struct sockaddr_un
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struct __attribute_struct_may_alias__ sockaddr_un
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{
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__SOCKADDR_COMMON (sun_);
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char sun_path[108]; /* Path name. */
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@ -153,7 +153,7 @@ enum __socket_type
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#include <bits/sockaddr.h>
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/* Structure describing a generic socket address. */
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struct sockaddr
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struct __attribute_struct_may_alias__ sockaddr
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{
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__SOCKADDR_COMMON (sa_); /* Common data: address family and length. */
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char sa_data[14]; /* Address data. */
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@ -170,7 +170,7 @@ struct sockaddr
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#define _SS_PADSIZE \
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(_SS_SIZE - __SOCKADDR_COMMON_SIZE - sizeof (__ss_aligntype))
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struct sockaddr_storage
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struct __attribute_struct_may_alias__ sockaddr_storage
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{
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__SOCKADDR_COMMON (ss_); /* Address family, etc. */
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char __ss_padding[_SS_PADSIZE];
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@ -181,7 +181,7 @@ typedef __socklen_t socklen_t;
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#include <bits/sockaddr.h>
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/* Structure describing a generic socket address. */
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struct sockaddr
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struct __attribute_struct_may_alias__ sockaddr
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{
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__SOCKADDR_COMMON (sa_); /* Common data: address family and length. */
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char sa_data[14]; /* Address data. */
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@ -194,7 +194,7 @@ struct sockaddr
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#define _SS_PADSIZE \
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(_SS_SIZE - __SOCKADDR_COMMON_SIZE - sizeof (__ss_aligntype))
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struct sockaddr_storage
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struct __attribute_struct_may_alias__ sockaddr_storage
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{
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__SOCKADDR_COMMON (ss_); /* Address family, etc. */
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char __ss_padding[_SS_PADSIZE];
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@ -26,7 +26,7 @@
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From Linux 2.1 the AF_PACKET interface is preferred and you should
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consider using it in place of this one. */
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struct sockaddr_pkt
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struct __attribute_struct_may_alias__ sockaddr_pkt
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{
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__SOCKADDR_COMMON (spkt_);
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unsigned char spkt_device[14];
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@ -22,7 +22,7 @@
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#include <features.h>
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#include <bits/sockaddr.h>
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struct sockaddr_ash
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struct __attribute_struct_may_alias__ sockaddr_ash
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{
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__SOCKADDR_COMMON (sash_); /* Common data: address family etc. */
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int sash_ifindex; /* Interface to use. */
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@ -28,7 +28,7 @@ struct ec_addr
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unsigned char net; /* Network number. */
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};
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struct sockaddr_ec
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struct __attribute_struct_may_alias__ sockaddr_ec
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{
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__SOCKADDR_COMMON (sec_);
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unsigned char port; /* Port number. */
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@ -23,7 +23,7 @@
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__BEGIN_DECLS
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struct sockaddr_iucv
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struct __attribute_struct_may_alias__ sockaddr_iucv
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{
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__SOCKADDR_COMMON (siucv_);
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unsigned short siucv_port; /* Reserved */
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