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PSIGNAL(3PROC) |
Process Control Library Functions |
PSIGNAL(3PROC) |
NAME
Psignal — set signal tracing action
LIBRARY
Process Control Library (libproc, -lproc)
SYNOPSIS
#include <libproc.h>
int
Psignal(
struct ps_prochandle *P,
int which,
int stop);
DESCRIPTION
The
Psignal() function sets the signal tracing flag for the process handle
P. If
stop is
non-zero it causes the process handle to stop threads that encounter the signal
which. If
stop is
zero, then it disables tracing for the signal
which.
The signal constants, representing valid values for
which, can be found in
signal.h(3HEAD). The signal
SIGKILL may not be stopped.
Note, only active processes may have their signal tracing flags updated. Process handles that refer to core files, zombie processes, and files do not have signal tracing flags. Calling this function on them is an error.
RETURN VALUES
Upon successful completion, the Psignal() function returns the previous disposition of the signal which. It returns 1 if it was set and 0 if not. Otherwise, -1 is returned and errno is set to indicate the error.
ERRORS
The
Psignal() function will fail if:
-
EINVAL
-
which is SIGKILL and stop is non-zero .
which is not a valid signal.
-
ENOENT
-
P does not correspond to an active process.
INTERFACE STABILITY
Uncommitted