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
__setrlimit(int resource,const struct rlimit * rlim)9 static int __setrlimit(int resource, const struct rlimit *rlim)
10 {
11 unsigned long k_rlim[2];
12 struct rlimit tmp;
13 if (SYSCALL_RLIM_INFINITY != RLIM_INFINITY) {
14 tmp = *rlim;
15 FIX(tmp.rlim_cur);
16 FIX(tmp.rlim_max);
17 rlim = &tmp;
18 }
19 int ret = __syscall(SYS_prlimit64, 0, resource, rlim, 0);
20 if (ret != -ENOSYS) return ret;
21 k_rlim[0] = MIN(rlim->rlim_cur, MIN(-1UL, SYSCALL_RLIM_INFINITY));
22 k_rlim[1] = MIN(rlim->rlim_max, MIN(-1UL, SYSCALL_RLIM_INFINITY));
23 return __syscall(SYS_setrlimit, resource, k_rlim);
24 }
25
26 struct ctx {
27 const struct rlimit *rlim;
28 int res;
29 int err;
30 };
31
do_setrlimit(void * p)32 static void do_setrlimit(void *p)
33 {
34 struct ctx *c = p;
35 if (c->err>0) return;
36 c->err = -__setrlimit(c->res, c->rlim);
37 }
38
setrlimit(int resource,const struct rlimit * rlim)39 int setrlimit(int resource, const struct rlimit *rlim)
40 {
41 struct ctx c = { .res = resource, .rlim = rlim, .err = -1 };
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 }
49
50 weak_alias(setrlimit, setrlimit64);
51