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.Dd May 11, 2016 .Dt PERROR_PRINTF 3PROC .Os .Sh NAME .Nm Perror_printf .Nd interposable function for additional diagnostics .Sh SYNOPSIS .Ft void .Fo Perror_printf .Fa "struct ps_prochandle *P" .Fa "const char *format" .Fa "..." .Fc .Sh DESCRIPTION The .Fn Perror_printf function allows for consumers of the .Sy libproc library to obtain additional diagnostic information during various operations. Consumers must explicitly .Em interpose on this symbol and provide their own definition, if desired. There is no requirement for such an interposition to be done. When called, .Fa P will be the process handle that the additional diagnostics are being generated for and the diagnostics will be provided in a .Xr printf 3C style. .Sh INTERFACE STABILITY .Sy Uncommitted

p While the interposing interface is .Sy uncommitted , the provided diagnostics are .Sy Not-an-Interface and may change at any time. .Sh LOCKING Callers should presume that this function may be called from multiple threads and always in a context in which taking locks is fine. Callers should not expect to be called from a signal handler. .Sh SEE ALSO .Xr libproc 3LIB