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.Dd May 11, 2016 .Dt PCREATE_AGENT 3PROC .Os .Sh NAME .Nm Pcreate_agent .Nd create the agent LWP .Sh SYNOPSIS .Lb libproc n libproc.h .Ft int .Fo Pcreate_agent .Fa "struct ps_prochandle *P" .Fc .Sh DESCRIPTION The .Fn Pcreate_agent function creates the agent LWP in the process represented by the handle .Fa P . The agent LWP is used as a means to force system calls to be invoked on the controlled process. For more information on the agent LWP, see .Xr proc 4 .

p The agent LWP cannot be created for process handles corresponding to core files, zombie processes, processes that have yet to run, and ELF objects.

p The .Fn Pcreate_agent function is reentrant. It may be entered recursively. The act of creating the agent LWP will cause the process to be stopped. For every call to the .Fn Pcreate_agent function, a corresponding call to .Xr Pdestroy_agent 3PROC is required. .Sh RETURN VALUES Upon successful completion, the .Fn Pcreate_agent function returns .Sy 0 and creates the agent LWP. Otherwise, .Sy -1 is returned, .Sy errno is set to indicate the error, and the agent LWP is not created. .Sh ERRORS The .Fn Pcreate_agent function will fail if: l -tag -width Er t Er ENOENT The process referred to by .Fa P is a core file, zombie, ELF object, or has not begun execution. .El

p Note, it is possible for other error numbers to be returned. If they are, they represent unanticipated failure. .Sh INTERFACE STABILITY .Sy Uncommitted .Sh MT-LEVEL See .Sy LOCKING in .Xr libproc 3LIB . .Sh SEE ALSO .Xr libproc 3LIB , .Xr Pdestroy_agent 3PROC , .Xr proc 4