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PRCTL(2) Linux Programmer’s Manual PRCTL(2)
NAME
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 pro-
cess 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 sig-
nal into the (int *) arg2.
PR_SET_DUMPABLE
(Since Linux 2.4) Set the state of the flag determining whether core dumps
are produced for this process upon delivery of a signal whose default
behaviour is to produce a core dump. (Normally this flag is set for a pro-
cess by default, but it is cleared when a set-UID or set-GID program is exe-
cuted and also by various system calls that manipulate process UIDs and
GIDs). arg2 must be either 0 (process is not dumpable) or 1 (process is
dumpable).
PR_GET_DUMPABLE
(Since Linux 2.4) Return (as the function result) the current state of the
calling process’s dumpable flag.
PR_SET_KEEPCAPS
Set the state of the process’s "keep capabilities" flag, which determines
whether the process’s effective and permitted capability sets are cleared
when a change is made to the process’s user IDs such that all of the pro-
cess’s real, effective, and saved set user IDs become non-zero when at least
one of them previously had the value 0. (By default, these credential sets
are cleared). arg2 must be either 0 (capabilities are cleared) or 1 (capa-
bilities are kept).
PR_GET_KEEPCAPS
Return (as the function result) the current state of the calling process’s
"keep capabilities" flag.
RETURN VALUE
PR_GET_DUMPABLE and PR_GET_KEEPCAPS return 0 or 1 on success. All other option
values return 0 on success. On error, -1 is returned, and errno is set appropri-
ately.
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)
Linux 2.4.18 2002-06-27 PRCTL(2)
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On Apache/1.3.41 (Unix) PHP/5.2.5 mod_perl/1.30 mod_gzip/1.3.26.1a
Under GNU General Public License
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