check for sys/pidfd.h

This header in newer glibc defines the signatures of functions
pidfd_send_signal() and pidfd_open() and when these functions are
defined by libc then we need to include the relevant header to get
the definitions. Clang 15+ has started to error out when function
signatures are missing.

Fixes errors like
misc-utils/kill.c:402:6: error: call to undeclared function 'pidfd_send_signal'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
        if (pidfd_send_signal(pfd, ctl->numsig, &info, 0) < 0)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
pull/1769/head
Khem Raj 2 months ago
parent 8ac75e31de
commit 84732a8849
  1. 1
      configure.ac
  2. 4
      include/pidfd-utils.h

@ -342,6 +342,7 @@ AC_CHECK_HEADERS([ \
sys/mkdev.h \
sys/mount.h \
sys/param.h \
sys/pidfd.h \
sys/prctl.h \
sys/resource.h \
sys/sendfile.h \

@ -4,8 +4,10 @@
#ifdef HAVE_SYS_SYSCALL_H
# include <sys/syscall.h>
# if defined(SYS_pidfd_send_signal) && defined(SYS_pidfd_open)
# ifdef HAVE_SYS_PIDFD_H
# include <sys/pidfd.h>
# endif
# include <sys/types.h>
# ifndef HAVE_PIDFD_SEND_SIGNAL
static inline int pidfd_send_signal(int pidfd, int sig, siginfo_t *info,
unsigned int flags)

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