Date: Sun, 23 Oct 2011 23:52:31 +0200 From: "Christopher J. Ruwe" <cjr@cruwe.de> To: <freebsd-hackers@freebsd.org> Subject: _SC_GETPW_R_SIZE_MAX undefined in sysconf.c, what is correct value? Message-ID: <20111023235231.71f73ea3@dijkstra>
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I need to get the maximum size of an pwd-entry to determine the correct
buffersize for calling getpwnam_r("uname",&pwd, buf, bufsize, &pwdp). I
would like to use sysconf(_SC_GETPW_R_SIZE_MAX) to determine bufsize,
which unfornutately fails (returns -1). Currently, I used 16384, which
seems to be too much, bit works for the time being.
=46rom recent mails I get that _SC_GETPW_R_SIZE_MAX is not available on FreeB=
SD, e.g., http://lists.freebsd.org/pipermail/freebsd-ports-bugs/2009-Septem=
ber/173081.html and http://www.redhat.com/archives/libvir-list/2011-May/msg=
01013.html. This assertion seems to be backed by /usr/srclib/libc/gen/sysco=
nf.c, line 374.
=46rom Stevens & Rago, Adavanced Programming in the UNIX Environment, I can g=
et that FreeBSD supports all possible members in the passwd structure, but =
where can I determine the maximum size of these so that I can calculate the=
ax size of the pwd struct therefrom? Does anybody know or know where to lo=
ok what maximum size a pwd-entry can have?=20
Knowing the maximum size a pwd structure can have, it seems like to be an i=
dea to define the correct value in sysconf.c. As that is not done though su=
ggested in the code, are there any obstacles in defining that value so nobo=
dy has done that so far?
Thanks for any help, cheers,=20
--=20
Christopher J. Ruwe
TZ GMT + 2
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