Date: Wed, 2 Mar 2005 14:26:29 -0800 (PST) From: Nine Forty <pm940@yahoo.com> To: freebsd-questions@freebsd.org Subject: SUN_LEN(addr) vs. SUN_LEN(addr) + 1. Message-ID: <20050302222629.82196.qmail@web54002.mail.yahoo.com>
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/usr/include/sys/un.h says:
/*
* Definitions for UNIX IPC domain.
*/
struct sockaddr_un {
u_char sun_len; /* sockaddr
len including null */
u_char sun_family; /* AF_UNIX */
char sun_path[104]; /* path name
(gag) */
};
... but it also says:
/* actual length of an initialized sockaddr_un */
#define SUN_LEN(su) \
(sizeof(*(su)) - sizeof((su)->sun_path) +
strlen((su)->sun_path))
Which doesn't include the nul at the end of sun_path.
When calling bind(2) or sendmsg(2), is SUN_LEN(addr)
valid, or should it be SUN_LEN(addr) + 1? Various
programs under /usr/src use plain SUN_LEN(addr).
Is there a problem with the comment, the macro, the
applications, or none of the above?
Thanks.
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