prctl - operations on a process
SYNOPSIS
#include <sys/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 pro
cess 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.
signal(2)
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