include/pidfd-utils.h

   1 /*
   2  * No copyright is claimed.  This code is in the public domain; do with
   3  * it what you wish.
   4  */
   5 #ifndef UTIL_LINUX_PIDFD_UTILS
   6 #define UTIL_LINUX_PIDFD_UTILS
   7
   8 #ifdef HAVE_SYS_SYSCALL_H
   9 # include <sys/syscall.h>
  10
  11 /*
  12  * If the kernel headers are too old to provide the syscall numbers, let's
  13  * define them ourselves. This can be helpful while cross-compiling.
  14  */
  15 #ifndef __NR_pidfd_send_signal
  16 #define __NR_pidfd_send_signal 424
  17 #define SYS_pidfd_send_signal __NR_pidfd_send_signal
  18 #endif
  19 #ifndef __NR_pidfd_open
  20 #define __NR_pidfd_open 434
  21 #define SYS_pidfd_open __NR_pidfd_open
  22 #endif
  23
  24 # if defined(SYS_pidfd_send_signal) && defined(SYS_pidfd_open)
  25 #  ifdef HAVE_SYS_PIDFD_H
  26 #   include <sys/pidfd.h>
  27 #  endif
  28 #  include <sys/types.h>
  29 #  ifndef HAVE_PIDFD_SEND_SIGNAL
  30 #   include <sys/wait.h>
  31 static inline int pidfd_send_signal(int pidfd, int sig, siginfo_t *info,
  32                                     unsigned int flags)
  33 {
  34         return syscall(SYS_pidfd_send_signal, pidfd, sig, info, flags);
  35 }
  36 #  endif
  37
  38 #  ifndef HAVE_PIDFD_OPEN
  39 static inline int pidfd_open(pid_t pid, unsigned int flags)
  40 {
  41         return syscall(SYS_pidfd_open, pid, flags);
  42 }
  43 #  endif
  44
  45 #  define UL_HAVE_PIDFD 1
  46
  47 # endif /* SYS_pidfd_send_signal */
  48 #endif /* HAVE_SYS_SYSCALL_H */
  49 #endif /* UTIL_LINUX_PIDFD_UTILS */