1#include <sys/resource.h>
 2#include <errno.h>
 3#include "syscall.h"
 4#include "libc.h"
 5
 6#define MIN(a, b) ((a)<(b) ? (a) : (b))
 7#define FIX(x) do{ if ((x)>=SYSCALL_RLIM_INFINITY) (x)=RLIM_INFINITY; }while(0)
 8
 9struct ctx {
10	unsigned long lim[2];
11	int res;
12	int err;
13};
14
15#ifdef SYS_setrlimit
16static void do_setrlimit(void *p)
17{
18	struct ctx *c = p;
19	if (c->err>0) return;
20	c->err = -__syscall(SYS_setrlimit, c->res, c->lim);
21}
22#endif
23
24int setrlimit(int resource, const struct rlimit *rlim)
25{
26	struct rlimit tmp;
27	if (SYSCALL_RLIM_INFINITY != RLIM_INFINITY) {
28		tmp = *rlim;
29		FIX(tmp.rlim_cur);
30		FIX(tmp.rlim_max);
31		rlim = &tmp;
32	}
33	int ret = __syscall(SYS_prlimit64, 0, resource, rlim, 0);
34#ifdef SYS_setrlimit
35	if (ret != -ENOSYS) return __syscall_ret(ret);
36
37	struct ctx c = {
38		.lim[0] = MIN(rlim->rlim_cur, MIN(-1UL, SYSCALL_RLIM_INFINITY)),
39		.lim[1] = MIN(rlim->rlim_max, MIN(-1UL, SYSCALL_RLIM_INFINITY)),
40		.res = resource, .err = -1
41	};
42	__synccall(do_setrlimit, &c);
43	if (c.err) {
44		if (c.err>0) errno = c.err;
45		return -1;
46	}
47	return 0;
48#else
49	return __syscall_ret(ret);
50#endif
51}