setrlimit.c raw

   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  static void do_setrlimit(void *p)
  16  {
  17  	struct ctx *c = p;
  18  	if (c->err>0) return;
  19  	c->err = -__syscall(SYS_setrlimit, c->res, c->lim);
  20  }
  21  
  22  int setrlimit(int resource, const struct rlimit *rlim)
  23  {
  24  	struct rlimit tmp;
  25  	if (SYSCALL_RLIM_INFINITY != RLIM_INFINITY) {
  26  		tmp = *rlim;
  27  		FIX(tmp.rlim_cur);
  28  		FIX(tmp.rlim_max);
  29  		rlim = &tmp;
  30  	}
  31  	int ret = __syscall(SYS_prlimit64, 0, resource, rlim, 0);
  32  	if (ret != -ENOSYS) return __syscall_ret(ret);
  33  
  34  	struct ctx c = {
  35  		.lim[0] = MIN(rlim->rlim_cur, MIN(-1UL, SYSCALL_RLIM_INFINITY)),
  36  		.lim[1] = MIN(rlim->rlim_max, MIN(-1UL, SYSCALL_RLIM_INFINITY)),
  37  		.res = resource, .err = -1
  38  	};
  39  	__synccall(do_setrlimit, &c);
  40  	if (c.err) {
  41  		if (c.err>0) errno = c.err;
  42  		return -1;
  43  	}
  44  	return 0;
  45  }
  46  
  47  weak_alias(setrlimit, setrlimit64);
  48