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sysconf support for dynamic limits (open files and processes)

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This commit is contained in:
Rich Felker 2012-03-22 01:00:35 -04:00
commit 2e0c1fed36
1 changed files with 9 additions and 2 deletions
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11
src/conf/sysconf.c
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@ -1,18 +1,21 @@
#include <unistd.h> #include <unistd.h>
#include <limits.h> #include <limits.h>
#include <errno.h> #include <errno.h>
#include <sys/resource.h>
#include "syscall.h"
#define VER (-2) #define VER (-2)
#define OFLOW (-3) #define OFLOW (-3)
#define RLIM(x) (-32768|(RLIMIT_ ## x))
long sysconf(int name) long sysconf(int name)
{ {
static const short values[] = { static const short values[] = {
[_SC_ARG_MAX] = OFLOW, [_SC_ARG_MAX] = OFLOW,
[_SC_CHILD_MAX] = -1, [_SC_CHILD_MAX] = RLIM(NPROC),
[_SC_CLK_TCK] = 100, [_SC_CLK_TCK] = 100,
[_SC_NGROUPS_MAX] = 32, [_SC_NGROUPS_MAX] = 32,
[_SC_OPEN_MAX] = 1024, [_SC_OPEN_MAX] = RLIM(NOFILE),
[_SC_STREAM_MAX] = -1, [_SC_STREAM_MAX] = -1,
[_SC_TZNAME_MAX] = TZNAME_MAX, [_SC_TZNAME_MAX] = TZNAME_MAX,
[_SC_JOB_CONTROL] = 1, [_SC_JOB_CONTROL] = 1,
@ -217,6 +220,10 @@ long sysconf(int name)
} else if (values[name] == OFLOW) { } else if (values[name] == OFLOW) {
if (name == _SC_ARG_MAX) return ARG_MAX; if (name == _SC_ARG_MAX) return ARG_MAX;
if (name == _SC_SEM_VALUE_MAX) return SEM_VALUE_MAX; if (name == _SC_SEM_VALUE_MAX) return SEM_VALUE_MAX;
} else if (values[name] < 0) {
long lim[2];
__syscall(SYS_getrlimit, values[name]&16383, lim);
return lim[0] < 0 ? LONG_MAX : lim[0];
} }
return values[name]; return values[name];
} }