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Top Forums Programming How to find if a process a daemon ? Post 302212560 by vino on Monday 7th of July 2008 10:06:53 PM
Old 07-07-2008
How to find if a process a daemon ?

I have a scenario where I need to find if a process is a daemon process or not. This check needs to be done from within the process. I know there are no direct API's to do so. I have explored these options.

1. ctermid() - this can be unsuccessful as per the man pages
2. int devtty; if ((devtty = open ("/dev/tty", O_RDWR)) < 0) then it is a daemon. Are there any other cases, where this may not be true ?
3. Since setsid() is used to detach from a terminal, perhaps getsid() can be used to check for process group leader and session leader.
4. Look if parent pid is 1 or not. Can a daemon process have a ppid other than 1 ?

Are there more options ? I dont know if there is a best way to do this, but what would be the most appropriate way ?
 

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SETSID(2)						      BSD System Calls Manual							 SETSID(2)

NAME
setsid -- create session and set process group ID LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <unistd.h> pid_t setsid(void); DESCRIPTION
The setsid() function creates a new session. The calling process is the session leader of the new session, is the process group leader of a new process group and has no controlling terminal. The calling process is the only process in either the session or the process group. Upon successful completion, the setsid() function returns the value of the process group ID of the new process group, which is the same as the process ID of the calling process. ERRORS
If an error occurs, setsid() returns -1 and the global variable errno is set to indicate the error, as follows: [EPERM] The calling process is already a process group leader, or the process group ID of a process other than the calling process matches the process ID of the calling process. SEE ALSO
getsid(2), setpgid(2), tcgetpgrp(3), tcsetpgrp(3) STANDARDS
The setsid() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1''). BSD
April 4, 2011 BSD
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