Installed-header hygiene (BZ#20366): conditionally defined structures.

Several network-related structures are defined conditionally under
__USE_MISC, but unconditionally used by other headers.  The path of
least resistance is usually to condition the uses on __USE_MISC as
well.

	* sysdeps/mach/hurd/net/if_ppp.h
	* sysdeps/unix/sysv/linux/net/if_ppp.h:
        Only define struct ifpppstatsreq and struct ifpppcstatsreq
        if __USE_MISC is defined, to ensure struct ifreq is declared.

	* inet/netinet/ether.h: Condition all function prototypes
        on __USE_MISC, to ensure struct ether_addr is declared.

sys/socket.h defines struct osockaddr only under __USE_MISC, whereas
protocols/talkd.h requires it unconditionally.  Here it doesn't make
sense to condition the entire body of protocols/talkd.h on __USE_MISC.
Rather than complicate sys/socket.h with a __need macro or duplicate
the definition, I am introducing a new concept: tiny headers named
bits/types/TYPE.h that define TYPE and nothing else.  This can, I hope,
ultimately replace *all* the __need macros.  The guard macro for such
headers will be __TYPE_defined, just in case application or third-party
library code is looking at them.

	* socket/bits/types/struct_osockaddr.h: New header.
	* include/bits/types/struct_osockaddr.h: New wrapper.
	* socket/Makefile: Install the new header.
	* socket/sys/socket.h,  inet/protocols/talkd.h:
	Refer to bits/types/struct_osockaddr.h for the definition of
	struct osockaddr.
This commit is contained in:
Zack Weinberg 2016-07-13 15:20:29 -04:00
parent 11160cb76f
commit f2bea4da2e
9 changed files with 42 additions and 8 deletions

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@ -1,3 +1,20 @@
2016-09-23 Zack Weinberg <zackw@panix.com>
* sysdeps/mach/hurd/net/if_ppp.h
* sysdeps/unix/sysv/linux/net/if_ppp.h:
Only define struct ifpppstatsreq and struct ifpppcstatsreq
if __USE_MISC is defined, to ensure struct ifreq is declared.
* inet/netinet/ether.h: Condition all function prototypes
on __USE_MISC, to ensure struct ether_addr is declared.
* socket/bits/types/struct_osockaddr.h: New header.
* include/bits/types/struct_osockaddr.h: New wrapper.
* socket/Makefile: Install the new header.
* socket/sys/socket.h, inet/protocols/talkd.h:
Refer to bits/types/struct_osockaddr.h for the definition of
struct osockaddr.
2016-09-23 Zack Weinberg <zackw@panix.com>
* bits/in.h, gmon/sys/gmon.h, inet/netinet/igmp.h

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@ -0,0 +1 @@
#include "../../socket/bits/types/struct_osockaddr.h"

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@ -24,6 +24,7 @@
/* Get definition of `struct ether_addr'. */
#include <netinet/if_ether.h>
#ifdef __USE_MISC
__BEGIN_DECLS
/* Convert 48 bit Ethernet ADDRess to ASCII. */
@ -49,5 +50,6 @@ extern int ether_line (const char *__line, struct ether_addr *__addr,
char *__hostname) __THROW;
__END_DECLS
#endif /* Use misc. */
#endif /* netinet/ether.h */

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@ -53,6 +53,7 @@
#include <sys/types.h>
#include <sys/socket.h>
#include <stdint.h>
#include <bits/types/struct_osockaddr.h>
/*
* Client->server request message format.

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@ -23,7 +23,8 @@ subdir := socket
include ../Makeconfig
headers := sys/socket.h sys/un.h bits/sockaddr.h bits/socket.h \
bits/socket2.h sys/socketvar.h net/if.h
bits/socket2.h bits/types/struct_osockaddr.h \
sys/socketvar.h net/if.h
routines := accept bind connect getpeername getsockname getsockopt \
listen recv recvfrom recvmsg send sendmsg sendto \

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@ -0,0 +1,12 @@
#ifndef __osockaddr_defined
#define __osockaddr_defined 1
/* This is the 4.3 BSD `struct sockaddr' format, which is used as wire
format in the grotty old 4.3 `talk' protocol. */
struct osockaddr
{
unsigned short int sa_family;
unsigned char sa_data[14];
};
#endif

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@ -38,13 +38,7 @@ __BEGIN_DECLS
#include <bits/socket.h>
#ifdef __USE_MISC
/* This is the 4.3 BSD `struct sockaddr' format, which is used as wire
format in the grotty old 4.3 `talk' protocol. */
struct osockaddr
{
unsigned short int sa_family;
unsigned char sa_data[14];
};
# include <bits/types/struct_osockaddr.h>
#endif
/* The following constants should be used for the second parameter of

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@ -119,6 +119,8 @@ struct ppp_option_data {
int transmit;
};
/* 'struct ifreq' is only available from net/if.h under __USE_MISC. */
#ifdef __USE_MISC
struct ifpppstatsreq {
struct ifreq b;
struct ppp_stats stats; /* statistic information */
@ -131,6 +133,7 @@ struct ifpppcstatsreq {
#define ifr__name b.ifr_ifrn.ifrn_name
#define stats_ptr b.ifr_ifru.ifru_data
#endif
/*
* Ioctl definitions.

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@ -118,6 +118,8 @@ struct ppp_option_data {
int transmit;
};
/* 'struct ifreq' is only available from net/if.h under __USE_MISC. */
#ifdef __USE_MISC
struct ifpppstatsreq {
struct ifreq b;
struct ppp_stats stats; /* statistic information */
@ -130,6 +132,7 @@ struct ifpppcstatsreq {
#define ifr__name b.ifr_ifrn.ifrn_name
#define stats_ptr b.ifr_ifru.ifru_data
#endif
/*
* Ioctl definitions.