1.7.9-1: kill( pid, 0 ) on child before waitpid returns -1.

[Marcin Konarski <huginn78 at o2 dot pl>]

Subject says it all.

To restate:

pid = fork();
exec*(...);

/* child exits normally by itself,
   no waitpid() called yet. */

kill( pid, 0 ) is expected to return 0,
while it returns -1.

Attached program reproduces the issue.

Best regards.

-- 
  Huginn
GCS d? s: a C++$() UBLS++++$ P++ L++++$ E---
W+(-) N++ w-- O M- V- PS+ PE++ Y PGP-
t--- 5-- X- R !tv b++ DI+++ D+ G e* h r++ y**

#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>

int main( int argc, char** argv )
	{
	int errKill = 0;
	int errWaitPid = 0;
	int status = 0;
	int pid = fork();
	if ( ! pid )
		{
		execlp( "sleep", "sleep", "1", NULL );
		printf( "error\n" );
		abort();
		}
	else if ( pid > 0 )
		{
		sleep( 2 );
/*
		errWaitPid = waitpid( pid, &status, WNOHANG | WUNTRACED | WCONTINUED );
		printf( "errWaitPid = %d, errno = %d, comment = %s\n", errWaitPid, errno, strerror( errno ) );
*/
		errKill = kill( pid, 0 );
		printf( "errKill = %d, errno = %d, comment = %s\n", errKill, errno, strerror( errno ) );
		}
	else
		{
		printf( "error\n" );
		}
	return ( 0 );
	}

Attachment: cygcheck.out
Description: Text document

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