Daemon process Post: 12303

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Top Forums Programming Daemon process Post 12303 by s_chordia on Wednesday 26th of December 2001 05:19:16 AM

12-26-2001

Registered User

Daemon process

Hi,
I have to write a daemon process, which performs certain operations in the background.
Now since it performs operations in the background, it should not display anything to the standard output.
The problem is that it still displays, text on standard output.
Can anyone tell me (it is urgent) how to avoid this.
I have written the following function to initialize the daemon code ...

int
daemon_init()
{
int pid, fd;

if (getppid() == 1)
{
goto out;
}

#ifdef SIGTTOU
signal(SIGTTOU, SIG_IGN);
#endif
#ifdef SIGTTIN
signal(SIGTTIN, SIG_IGN);
#endif
#ifdef SIGTSTP
signal(SIGTSTP, SIG_IGN);
#endif

pid = fork();
if (pid < 0)
{
return -1;
}
else if (pid > 0)
{
/* In parent exit leaving the child to work */
exit(0);
}

if (setpgrp() == -1)
{
return -1;
}
signal(SIGHUP, SIG_IGN);

pid = fork();
if (pid < 0)
{
return -1;
}
else if (pid > 0)
{
/* first child exits */
exit(0);
}

out:
/*for (fd = 3; fd < NOFILE; fd++)
close(fd);*/
/* In child detach from the parents session */
/*setsid();*/
chdir("/");
umask(0);

return 0;
}

s_chordia

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LEARN ABOUT NETBSD

wait

WAIT(1) 						    BSD General Commands Manual 						   WAIT(1)

NAME

     wait -- await process completion

SYNOPSIS

     wait [pid]

DESCRIPTION

     If invoked with no arguments, the wait utility waits until all existing child processes in the background have terminated.

     Available operands:

     pid     If a pid operand is specified, and it is the process ID of a background child process that still exists, the wait utility waits until
	     that process has completed and consumes its status information, without consuming the status information of any other process.

	     If a pid operand is specified that is not the process ID of a child background process that still exists, wait exits without waiting
	     for any processes to complete.

     The wait utility exits with one of the following values:

     0	     The wait utility was invoked with no operands and all of the existing background child processes have terminated, or the process
	     specified by the pid operand exited normally with 0 as its exit status.

     >0      The specified process did not exist and its exit status information was not available, or the specified process existed or its exit
	     status information was available, and it terminated with a non-zero exit status.

     If the specified process terminated abnormally due to the receipt of a signal, the exit status information of wait contains that termination
     status as well.

STANDARDS

     The wait command is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

BSD
								   June 5, 1993 							       BSD

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