fusl/src/unistd/fchown.c

#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include "syscall.h"

void __procfdname(char*, unsigned);

int fchown(int fd, uid_t uid, gid_t gid) {
  int ret = __syscall(SYS_fchown, fd, uid, gid);
  if (ret != -EBADF || __syscall(SYS_fcntl, fd, F_GETFD) < 0)
    return __syscall_ret(ret);

  char buf[15 + 3 * sizeof(int)];
  __procfdname(buf, fd);
#ifdef SYS_chown
  return syscall(SYS_chown, buf, uid, gid);
#else
  return syscall(SYS_fchownat, AT_FDCWD, buf, uid, gid);
#endif
}