| Standards / Extensions | C or C++ | Dependencies |
|---|---|---|
z/OS® UNIX |
both | Z/OS V1R8 |
#define _OPEN_SYS
#include <unistd.h>
int __must_stay_clean(int request);The __must_stay_clean() function queries or enables the "must stay clean" state for a process. A process that must stay clean is prohibited from doing an exec(), spawn(), or other load of a non-program controlled executable. Only a program controlled executable can enable the must stay clean state. The must stay clean state of a process is propagated to its children created using fork or spawn. Once the must stay clean state is enabled, it cannot be changed. All processes in the address space will be forced to stay clean until they have all terminated. The query support allows a process to determine if it was created in a trusted environment. The BPX.DAEMON class profile must be defined to use the enable function.
If successful, __must_stay_clean() returns the current "must stay clean" state of the process. The following state values are possible:
/* celebm22.c */
/* This example shows how to use __must_stay_clean() to request */
/* the environment is to "stay clean" until all processes in the */
/* address space are terminated. */
/* Requirements: */
/* 1. The environment must already be clean, noting that the */
/* program issuing the request must be program-controlled */
/* 2. BPX.DAEMON must be defined */
#define _OPEN_SYS
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
int main(void){
int rc;
rc = __must_stay_clean(_MSC_ENABLE); /* Stay Clean! */
if (rc == __MSC_FAILED){
perror("could not enable must stay clean");
printf("errno=%d errno2=%08x\n",errno,__errno2());
exit(1);
}
return 0;
}