src/misc/setrlimit.c

   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
   9 struct ctx {
  10         unsigned long lim[2];
  11         int res;
  12         int err;
  13 };
  14
  15 #ifdef SYS_setrlimit
  16 static 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
  24 int 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 }