kc3-lang/libevent/cmake/CheckWaitpidSupportWNOWAIT.cmake

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• Hash : 43eb56c7
  Author :
  Date : 2016-08-11T16:15:45
  

  tests: use waitpid(..., WNOWAIT) to fix failing of main/fork under solaris
  
  According to solaris docs:
    "One instance of a SIGCHLD signal is queued for each child process whose
    status has changed. If waitpid() returns because the status of a child
    process is available, and WNOWAIT was not specified in options, any pending
    SIGCHLD signal associated with the process ID of that child process is
    discarded. Any other pending SIGCHLD signals remain pending."
  
  And interesting thing that it works if you add sleep(1) before waitpid(), and
  also if you run with --verbose (some race or what).
  
  But linux doesn't support WNOWAIT in waitpid() so add detection into
  cmake/autotools.
  
  Fixes: #387
  Link: https://bugzilla.redhat.com/show_bug.cgi?id=840782
  

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• cmake/CheckWaitpidSupportWNOWAIT.cmake

• include(CheckCSourceRuns)
  
  check_c_source_runs(
  "
  #include <unistd.h>
  #include <sys/types.h>
  #include <sys/wait.h>
  #include <stdlib.h>
  
  int
  main(int argc, char** argv)
  {
      pid_t pid;
      int status;
      if ((pid = fork()) == 0) _exit(0);
      _exit(waitpid(pid, &status, WNOWAIT) == -1);
  }"
  EVENT__HAVE_WAITPID_WITH_WNOWAIT)
  

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