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.Dd May 11, 2016 .Dt PISSYSCALL 3PROC .Os .Sh NAME .Nm Pissyscall , .Nm Pissyscall_prev , .Nd determine if instructions are system call instructions .Sh SYNOPSIS .Lb libproc n libproc.h .Ft int .Fo Pissyscall .Fa "struct ps_prochandle *P" .Fa "uintptr_t addr" .Fc .Ft int .Fo Pissyscall_prev .Fa "struct ps_prochandle *P" .Fa "uintptr_t addr" .Fa "uintptr_t *dst" .Fc .Sh DESCRIPTION The .Fn Pissyscall function determines whether or not the instructions at .Fa addr in the process handle .Fa P corresponds to one of the architecture's system call instructions.

p the .Fn Pissyscall_prev function determines whether or not the instruction before .Fa addr in the process handle .Fa P corresponds to one of the architecture's system call instructions. If it does, and .Fa dst is a

f non- Dv NULL pointer, then the address of the system call instruction will be copied into the location pointed to by .Fa dst . .Sh RETURN VALUES Upon successful completion, the .Fn Pissyscall function returns .Sy non-zero if .Fa addr corresponds to a system call instruction. Otherwise, .Sy 0 is returned.

p Upon successful completion, the .Fn Pissyscall_prev function returns .Sy non-zero if .Fa addr corresponds to a system call instruction and if .Fa dst is

f non- Dv NULL , .Fa dst is updated. Otherwise, .Sy 0 is returned. .Sh INTERFACE STABILITY .Sy Uncommitted .Sh MT-LEVEL See .Sy LOCKING in .Xr libproc 3LIB . .Sh SEE ALSO .Xr libproc 3LIB