05-21-2010
HI Jim, thanks for the reply. Once again aplologies for the text all being in one paragraph. No the script parses a .pid extension off a temporary directory and if it doesn't find a running process with that pid it clears down the directory. The problem I found when tracing the fail was a process with that id was still listed but with the arg DEFUNCT. You have got me thinking though, perhaps the transient error I found was due to the process id being reassigned to something else. That would explain why I am struggling to replicate it. I need to look at the code again and see if I can tighten it up so it finds the process name as well as the pid. One issue I am finding with these scripts is the ps args are often truncated to fit on screen and so the process name is not recoverable from the ps output. I think that is why they may have been written that way to start with. Do you know of anyway of forcing ps to output the whole line, wrapping if necessary? It would have to work on SUN and AIX..... Once again, thanks Jim, as always your very helpful
Last edited by steadyonabix; 05-21-2010 at 11:13 AM..
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LEARN ABOUT ULTRIX
setpgid
setpgid(3) Library Functions Manual setpgid(3)
Name
setpgid - set process group (POSIX)
Syntax
#include <sys/types.h>
int
setpgid(pid, pgrp)
pid_t pid, pgrp;
Description
The function is used to either join an existing process group or create a new process group within the session of the calling process (see
Upon successful completion, the process group ID of the process that has a process ID which matches pid is set to pgrp. If pid is zero,
then the call applies to the current process. In addition, if pgrp is zero, the process ID of the indicated process is used.
This function is available only in the POSIX environment.
Return Values
The function returns 0 when the operation is successful. If the request fails, -1 is returned and the global variable indicates the rea-
son.
Diagnostics
The function fails and the process group is not altered if one of the following occurs:
[EACCES] The value of the pid argument matches the process ID of a child process of the calling process and the child process has
successfully executed an function.
[EINVAL] The value of the pgrp argument is less than zero or is not a supported value.
[EPERM] The process indicated by the pid argument is a session leader.
The value of the pid argument matches the process ID of a child process of the calling process and the child process is not
in the same session as the calling process.
The value of the pgrp argument does not match the process ID of the process indicated by the pid argument and there is no
process with a process group ID that matches the value of the pgrp argument in the same session as the calling process.
[ESRCH] The value of the pid argument does not match the process ID of the calling process of a child process of the calling
process.
See Also
getpgrp(2), setsid(2)
setpgid(3)