PRCTL (2)
operations on a process
SYNOPSIS
#include <linux/prctl.h>
int prctl(int option , unsigned long arg2 , unsigned long arg3
, unsigned long arg4 , unsigned long arg5 );
DESCRIPTION
prctl
is called with a first argument describing what to do
(with values defined in <linux/prctl.h>), and further
parameters with a significance depending on the first one.
The first argument can be:
PR_SET_PDEATHSIG
(since Linux 2.1.57)
Set the parent process death signal
of the current process to arg2 (either a signal value
in the range 1..maxsig, or 0 to clear).
This is the signal that the current process will get when its
parent dies. This value is cleared upon a fork().
PR_GET_PDEATHSIG
(since Linux 2.3.15)
Read the current value of the parent process death signal
into the (int *) arg2.
RETURN VALUE
On success, zero is returned.
On error, -1 is returned, and
errno
is set appropriately.
ERRORS
EINVAL
The value of
option
is not recognized, or it is
PR_SET_PDEATHSIG
and
arg2
is not zero or a signal number.
CONFORMING TO
This call is Linux-specific.
IRIX has a prctl system call (also introduced in Linux 2.1.44
as irix_prctl on the MIPS architecture),
with prototype
ptrdiff_t prctl(int option , int arg2 , int arg3 );
and options to get the maximum number of processes per user,
get the maximum number of processors the calling process can use,
find out whether a specified process is currently blocked,
get or set the maximum stack size, etc., etc.
AVAILABILITY
The prctl() systemcall was introduced in Linux 2.1.57.
There is no prctl() library call as yet.
SEE ALSO
- signal (2) -
man2/psend 2 man2/PSND 2 man2/PSND 2
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