Guardian Procedure Calls Reference Manual (G06.25+)

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Guardian Procedure Calls (P)

Guardian Procedure Calls Reference Manual—522629-013

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PROCESS_SPAWN_ Procedure

In the C spawnh file, the structure for the inheritance parameter is defined as:

C programs should initialize the inheritance structure by setting the flags field to 0.

Z^Flags

specifies whether the Z^SIGMASK field or the Z^SIGDEFAULT field or both fields

are specified.

The following tables summarize the settings for Z^FLAGS. TAL literals are defined

in the ZSYSTAL file. Literals in the zsysc file, for C programs, are the same as

those for TAL except that they contain the underscore (_) character instead of the

circumflex (^) character.

Either one or both of the following values can be supplied:

Z^Pgroup

is not used by PROCESS_SPAWN_. Specify 0D.

Z^SigMask

is a mask indicating which signals are to be blocked by the new process when

Z^FLAGS contains ZSYS^VAL^SPAWN^SETSIGMASK. When Z^SIGMASK.<

is set to 1, the signal represented by bit <

n> is blocked.

Z^SigDefault

is a mask indicating which signals are to use default action for the new process

when Z^FLAGS contains ZSYS^VAL^SPAWN^SETSIGDEF. When

Z^SIGDEFAULT.<

n> is set to 1, the signal represented by bit <n> is used.

typedef struct inheritance {

short flags;

#define SPAWN_SETGROUP 0x01 /* not used by PROCESS_SPAWN_ */

#define SPAWN_SETSIGMASK 0x02/* controls child sigmask*/

#define SPAWN_SETSIGDEF 0x04 /* controls child sigmask*/

#define SPAWN_NOTDEFD 0xFFF8 /* undefined bit fields */

char filler_1[2];

pid_t pgroup;

sigset_t sigmask;

sigset_t sigdefault;

} inheritance;

Name (ZSYS^VAL^ ) Value Description

SPAWN^SETSIGDEF 4

indicates that

Z^SIGDEFAULT is specified

SPAWN^SETSIGMASK 2

indicates that

Z^SIGMASK is specified