procmgr_daemon()

Run a process in the background

Synopsis:

#include <sys/procmgr.h>

int procmgr_daemon( int status,
                    unsigned flags );

Arguments:

status

The status that you want to return to the parent process.

flags

The flags currently defined (in <sys/procmgr.h>) are:

PROCMGR_DAEMON_NOCHDIR — unless this flag is set, procmgr_daemon() changes the current working directory to the root “/”.
PROCMGR_DAEMON_NOCLOSE — unless this flag is set, procmgr_daemon() closes all file descriptors other than standard input, standard output and standard error.
PROCMGR_DAEMON_NODEVNULL — unless this flag is set, procmgr_daemon() redirects standard input, standard output and standard error to /dev/null.
PROCMGR_DAEMON_KEEPUMASK — unless this flag is set, procmgr_daemon() sets the umask to 0 (zero).

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The procmgr_daemon() function lets programs detach themselves from the controlling terminal and run in the background as system daemons. This also puts the caller into session 1.

The High Availability Manager (HAM) automatically monitors processes detached using procmgr_daemon() because they're in session 1. For more information, see the High Availability Framework Developer's Guide.

If procmgr_daemon() is called without PROCMGR_DAEMON_NOCLOSE set in flags and fails, then the state of file descriptors 0, 1, and 2 (STDIN_FILENO, STDOUT_FILENO, and STDERR_FILENO) is undefined.

The argument status is returned to the parent process as if exit() were called; the returned value is normally EXIT_SUCCESS.

Note: The data in the siginfo_t structure for the SIGCHLD signal that the parent receives isn't useful in this case.

Returns:

A nonnegative integer, or -1 if an error occurs (errno is set).

Classification:

QNX Neutrino

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	Yes
Thread	Yes