[Bug 109695] qemu using spice gl and sandbox resourcecontrol=deny crashes with SIGSYS on radeonsi

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109695

--- Comment #2 from Ahzo at tutanota.com ---
To check for the availability of the syscall, one can try it in a child process
and see if the child is terminated by a signal, e.g. like this:

#include <stdbool.h>
#include <unistd.h>
#include <sys/resource.h>
#include <sys/syscall.h>
#include <sys/wait.h>

static bool
can_set_affinity()
{
   pid_t pid = fork();
   int status = 0;
   if (!pid) {
      /* Disable coredumps, because a SIGSYS crash is expected. */
      struct rlimit limit = { 0 };
      limit.rlim_cur = 1;
      limit.rlim_max = 1;
      setrlimit(RLIMIT_CORE, &limit);
      /* Test the syscall in the child process. */
      syscall(SYS_sched_setaffinity, 0, 0, 0);
      _exit(0);
   } else if (pid < 0) {
      return false;
   }
   if (waitpid(pid, &status, 0) < 0) {
      return false;
   }
   if (WIFSIGNALED(status)) {
      /* The child process was terminated by a signal,
       * thus the syscall cannot be used.
       */
      return false;
   }
   return true;
}

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