libc/src/termios/linux/tcgetsid.cpp

   1 //===-- Linux implementation of tcgetsid ----------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/termios/tcgetsid.h"
  10
  11 #include "src/__support/OSUtil/syscall.h"
  12 #include "src/__support/common.h"
  13 #include "src/__support/macros/config.h"
  14 #include "src/errno/libc_errno.h"
  15
  16 #include <asm/ioctls.h> // Safe to include without the risk of name pollution.
  17 #include <sys/syscall.h> // For syscall numbers
  18 #include <termios.h>
  19
  20 namespace LIBC_NAMESPACE_DECL {
  21
  22 LLVM_LIBC_FUNCTION(pid_t, tcgetsid, (int fd)) {
  23   pid_t sid;
  24   int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_ioctl, fd, TIOCGSID, &sid);
  25   if (ret < 0) {
  26     libc_errno = -ret;
  27     return -1;
  28   }
  29   return sid;
  30 }
  31
  32 } // namespace LIBC_NAMESPACE_DECL