27 lines
771 B
C
27 lines
771 B
C
|
#include "./maxfd.h"
|
||
|
|
#include <errno.h>
|
||
|
|
|
||
|
|
long mp_open_max (void) {
|
||
|
|
long maxfd = 0L;
|
||
|
|
/* Try sysconf(_SC_OPEN_MAX) first, as it can be higher than OPEN_MAX.
|
||
|
|
* If that fails and the macro isn't defined, we fall back to an educated
|
||
|
|
* guess. There's no guarantee that our guess is adequate and the program
|
||
|
|
* will die with SIGSEGV if it isn't and the upper boundary is breached. */
|
||
|
|
|
||
|
|
#ifdef _SC_OPEN_MAX
|
||
|
|
errno = 0;
|
||
|
|
if ((maxfd = sysconf (_SC_OPEN_MAX)) < 0) {
|
||
|
|
if (errno == 0)
|
||
|
|
maxfd = DEFAULT_MAXFD; /* it's indeterminate */
|
||
|
|
else
|
||
|
|
die (STATE_UNKNOWN, _("sysconf error for _SC_OPEN_MAX\n"));
|
||
|
|
}
|
||
|
|
#elif defined(OPEN_MAX)
|
||
|
|
return OPEN_MAX
|
||
|
|
#else /* sysconf macro unavailable, so guess (may be wildly inaccurate) */
|
||
|
|
return DEFAULT_MAXFD;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
return(maxfd);
|
||
|
|
}
|