libc-top-half/musl/src/signal/sigaltstack.c

   1 #include <signal.h>
   2 #include <errno.h>
   3 #include "syscall.h"
   4
   5 int sigaltstack(const stack_t *restrict ss, stack_t *restrict old)
   6 {
   7         if (ss) {
   8                 if (ss->ss_size < MINSIGSTKSZ) {
   9                         errno = ENOMEM;
  10                         return -1;
  11                 }
  12                 if (ss->ss_flags & SS_ONSTACK) {
  13                         errno = EINVAL;
  14                         return -1;
  15                 }
  16         }
  17         return syscall(SYS_sigaltstack, ss, old);
  18 }