fusl/src/misc/getrlimit.c

#include <sys/resource.h>
#include <errno.h>
#include "syscall.h"
#include "libc.h"

#define FIX(x)                        \
  do {                                \
    if ((x) >= SYSCALL_RLIM_INFINITY) \
      (x) = RLIM_INFINITY;            \
  } while (0)

int getrlimit(int resource, struct rlimit* rlim) {
  unsigned long k_rlim[2];
  int ret = syscall(SYS_prlimit64, 0, resource, 0, rlim);
  if (!ret) {
    FIX(rlim->rlim_cur);
    FIX(rlim->rlim_max);
  }
  if (!ret || errno != ENOSYS)
    return ret;
  if (syscall(SYS_getrlimit, resource, k_rlim) < 0)
    return -1;
  rlim->rlim_cur = k_rlim[0] == -1UL ? RLIM_INFINITY : k_rlim[0];
  rlim->rlim_max = k_rlim[1] == -1UL ? RLIM_INFINITY : k_rlim[1];
  FIX(rlim->rlim_cur);
  FIX(rlim->rlim_max);
  return 0;
}