Monika, To me your assembler program looks very similar like REXX code. Whatever, there are two things to consider, but both deal with the vast overhead of creating the ASID as you mentioned and are independent of actual implementation: (a) Daemon vs. server: A daemon uses fork() callable service to clone itself. Afterwards, it may change security context and exec the new program. And exactly changing security context or identity (that is calling setuid() or setgid() callable service) is not available in same ASID as another process. So when you designed your application as daemon with change of identity, you explicitly choosed for that overhead of creating a new ASID everytime the daemon starts new work. In contrast, a server uses a different approach with pthread_security_np() callable service in order to set up a new security environment within the same ASID. And this "thread" can have a different identity within the same ASID. (b) fork vs. spawn: If there will be no change of identity, you can use spawn() callable service together with Unix symbol _BPX_SHAREAS set to YES or MUST. I am not sure if the REXX-function bpxwunix will honor that symbol. But I think it could be easily emulated by spawn syscall command. For assembler it should work with BPX1SPN. In contrast, BPX1FRK creates the new process without honoring z/OS specifica, especially _BPX_SHAREAS and therefore always results in a new ASID. Cheers Michael
Monika Amiss <[email protected]> Gesendet von: IBM Mainframe Discussion List <[email protected]> 2011-04-29 11:05 Bitte antworten an IBM Mainframe Discussion List <[email protected]> An [email protected] Kopie Thema assembler batch calling unix daemon Dear group, I need to call unix-OSNMP from an Assembler pgm which is running in z/OS (1.12)-Batch. I use Address SYSCALL call bpxwunix ''cmd'',,out.,, __environment. but as I must call bpxwunix often, the overhead is a problem (each time an Asid is created). What I need is a kind of persistent envirnoment: First establish a process and further on only make my updates. At the end close the environment. Is there something like this, or somebody has another idea how I can call OSNMPD from assembler batch. Any hint appreciated With best regards Monika Amiss ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
