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stdio is currently limited to file descriptors not greater than

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{SHRT_MAX}, so {STREAM_MAX} should be no greater than that.  (This
does not exactly meet the letter of POSIX but comes reasonably close
to it in spirit.)

MFC after:	14 days
This commit is contained in:
wollman 2008-02-27 05:56:57 +00:00
parent bcd067ff4f
commit e043fbfcde
1 changed files with 19 additions and 1 deletions
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20
lib/libc/gen/sysconf.c
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@ -100,7 +100,6 @@ sysconf(name)
mib[1] = KERN_NGROUPS;
break;
case _SC_OPEN_MAX:
case _SC_STREAM_MAX: /* assume fds run out before memory does */
if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
return (-1);
if (rl.rlim_cur == RLIM_INFINITY)
@ -109,6 +108,25 @@ sysconf(name)
errno = EOVERFLOW;
return (-1);
}
return ((long)rl.rlim_cur);
case _SC_STREAM_MAX:
if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
return (-1);
if (rl.rlim_cur == RLIM_INFINITY)
return (-1);
if (rl.rlim_cur > LONG_MAX) {
errno = EOVERFLOW;
return (-1);
}
/*
* struct __sFILE currently has a limitation that
* file descriptors must fit in a signed short.
* This doesn't precisely capture the letter of POSIX
* but approximates the spirit.
*/
if (rl.rlim_cur > SHRT_MAX)
return (SHRT_MAX);
return ((long)rl.rlim_cur);
case _SC_JOB_CONTROL:
return (_POSIX_JOB_CONTROL);