About sysconf(_SC_GETPW_R_SIZE_MAX)

[Konstantin Belousov]

On Fri, Jul 04, 2014 at 11:05:46AM +0400, Dmitry Sivachenko wrote:
> Hello!
> 
> (FreeBSD-10/stable).
> 
> According to sysconf(3), _SC_GETPW_R_SIZE_MAX is the valid argument to sysconf():
> 
>  _SC_GETPW_R_SIZE_MAX
>              Suggested initial value for the size of the password entry
>              buffer.
> 
> But the following test program fails:
> 
> #include <unistd.h>
> #include <err.h>
> #include <errno.h>
> #include <stdio.h>
> 
> int main() {
>   int buf_sz;
> 
>   errno=0;
>   buf_sz = sysconf(_SC_GETPW_R_SIZE_MAX);
>   printf("%d\n", buf_sz);
>   warn("sysconf: ");
>   return 0;
> }
> 
> % ./a.out 
> -1
> a.out: sysconf: : Invalid argument
> 
> 
> What is wrong?

From lib/libc/gen/sysconf.c, around line 327:
#if _POSIX_THREAD_SAFE_FUNCTIONS > -1
	case _SC_GETGR_R_SIZE_MAX:
	case _SC_GETPW_R_SIZE_MAX:
#error "somebody needs to implement this"
#endif

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