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.Dd May 11, 2016 .Dt PR_LINK 3PROC .Os .Sh NAME .Nm pr_link .Nd inject link system call into victim process .Sh SYNOPSIS .Lb libproc n libproc.h .Ft int .Fo pr_link .Fa "struct ps_prochandle *P" .Fa "const char *existing" .Fa "const char *new" .Fc .Sh DESCRIPTION The .Fn pr_link function injects the .Xr link 2 system call into the target process .Fa P by means of the agent LWP. If the process handle .Fa P is the value .Dv NULL then this will be equivalent to calling .Xr link 2 on the currently running process.

p The arguments .Fa existing and .Fa new have the same meaning as in .Xr link 2 . See .Xr link 2 for the full description and purpose of the .Sy link system call and its arguments.

p The .Fn pr_link function only works on active processes. Process handles that correspond to core files, zombie processes, or ELF objects do not support system call injection. .Sh RETURN VALUES Upon successful completion, the .Fn pr_link function's return value is that described in .Xr link 2 . Otherwise, .Sy -1 is returned and .Sy errno is set to .Er ENOSYS to indicate that the system call could not be injected. .Sh ERRORS For the full list of errors see the .Sy ERRORS section in .Xr link 2 .

p The .Fn pr_link function will fail if: l -tag -width Er t Er ENOSYS An error occurred while trying to invoke the agent LWP and inject a system call in the process handle .Fa P or the process handle .Fa P does not support system call injection. .El .Sh INTERFACE STABILITY .Sy Uncommitted .Sh MT-LEVEL See .Sy LOCKING in .Xr libproc 3LIB . .Sh SEE ALSO .Xr link 2 , .Xr libproc 3LIB , .Xr proc 4