Open System Services System Calls Reference Manual (G06.28+)

System Functions (t) tdm_spawn(2)
• The process name for the new process is system-generated if the RUNNAMED option is
set in the program file. Otherwise, the process is unnamed.
• The size of the data segment of the new process is set in the program file.
• The remote login flag (PCBREMID) is set to zero (off) if the program file has its
S_ISUID mode bit set. Otherwise, the remote login flag is set the same as for the caller.
• The size of the extended data segment of the new process is set in the program file.
• The DEFINEs inherited by the new process depend on the setting of DEFINE mode in
the caller. If DEFINE mode in the caller is ON, all the caller’s DEFINEs are inherited. If
DEFINE mode is OFF, no DEFINEs are inherited.
• The process identification number (PIN) of the child process is unrelated to that of the
parent process. Usually, the PIN of the child process is unrestricted. However, the PIN
can be restricted to the range 0 through 254 under the following conditions:
— The HIGHPIN flag is not set in, or is absent from, the program file or any library
file.
— _TPC_HIGHPIN_OFF is specified in the pe_create_options field of the
process_extension structure, described following.
— The restriction is inherited. See _TPC_IGNORE_FORCEPIN_ATTR in the
pe_create_options field of the process_extension structure, described follow-
ing, for more information about controlling inheritance.
• The process access ID (PAID) depends on whether the S_ISUID mode bit of the process
image file is set. If that bit is set, the PAID is based on the file owner ID. If not, the PAID
is the same as for the caller. (The S_ISUID mode bit of the image file has no effect on
the security group list.)
• For unnamed processes, the MOM field of the child process is NULL. For named
processes, the ancestor field identifies the parent.
• System debugger selection for the new process is based on the INSPECT mode of the
program file.
• Code breakpoints and memory breakpoints are not inherited.
For detailed information about Guardian process attributes, see the PROCESS_LAUNCH_ pro-
cedure in the Guardian Procedure Calls Reference Manual.
Setting Guardian Attributes
The input structure pointed to by the pe_parms parameter permits the setting of Guardian attri-
butes for the new process.
First, the input structure must be initialized to the default values (see Default Guardian Attri-
butes, earlier in this reference page) using the #define DEFAULT_PROCESS_EXTENSION.
After the structure is initialized, the values can be set using literals that are defined in the
tdmext.h header file.
If any optional parameter specified in the structure pointed to by pe_parms is not passed, the new
process assumes the corresponding default value.
The input structure is defined in the tdmext.h header file. This structure can contain fields that
vary from release version update (RVU) to RVU, including reserved and filler fields.
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