mirror of https://github.com/mkerrisk/man-pages
Updated Linux versions where the options where introduced.
Added PR_SET_TIMING, PR_GET_TIMING, PR_SET_NAME, PR_GET_NAME, PR_SET_UNALIGN, PR_GET_UNALIGN, PR_SET_FPEMU, PR_GET_FPEMU, PR_SET_FPEXC, PR_GET_FPEXC.
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Michael Kerrisk
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man2/prctl.2
75
man2/prctl.2
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@ -26,11 +26,13 @@
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.\" Modified 27 Jun 02, Michael Kerrisk
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.\" Added PR_SET_DUMPABLE, PR_GET_DUMPABLE,
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.\" PR_SET_KEEPCAPS, PR_GET_KEEPCAPS
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.\" Modified 2006-08-30 Guillem Jover <guillem@hadrons.org>
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.\" Updated Linux versions where the options where introduced.
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.\" Added PR_SET_TIMING, PR_GET_TIMING, PR_SET_NAME, PR_GET_NAME,
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.\" PR_SET_UNALIGN, PR_GET_UNALIGN, PR_SET_FPEMU, PR_GET_FPEMU,
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.\" PR_SET_FPEXC, PR_GET_FPEXC
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.\"
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.\" FIXME The following (applicable only on IA-64) are not currently
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.\" described: PR_SET_UNALIGN, PR_GET_UNALIGN, PR_SET_FPEMU, PR_GET_FPEMU
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.\"
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.TH PRCTL 2 2002-06-27 "Linux 2.4.18" "Linux Programmer's Manual"
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.TH PRCTL 2 2006-08-30 "Linux 2.6.17" "Linux Programmer's Manual"
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.SH NAME
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prctl \- operations on a process
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.SH SYNOPSIS
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@ -56,12 +58,12 @@ This value is cleared upon a
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.BR fork ().
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.TP
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.B PR_GET_PDEATHSIG
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(since Linux 2.3.15)
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(Since Linux 2.3.15)
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Read the current value of the parent process death signal
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into the (int *) \fIarg2\fP.
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.TP
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.B PR_SET_DUMPABLE
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(Since Linux 2.4)
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(Since Linux 2.3.20)
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Set the state of the flag determining whether core dumps are produced
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for this process upon delivery of a signal whose default behaviour is
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to produce a core dump.
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@ -85,7 +87,7 @@ in
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.BR proc (5).)
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.TP
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.B PR_GET_DUMPABLE
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(Since Linux 2.4)
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(Since Linux 2.3.20)
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Return (as the function result) the current state of the calling
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process's dumpable flag.
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.\" Since Linux 2.6.13, the dumpable flag can have the value 2,
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@ -93,6 +95,7 @@ process's dumpable flag.
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.\" flags has a non-zero value. This was fixed in 2.6.14.
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.TP
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.B PR_SET_KEEPCAPS
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(Since Linux 2.2.18)
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Set the state of the process's "keep capabilities" flag,
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which determines whether the process's effective and permitted
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capability sets are cleared when a change is made to the process's user IDs
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@ -103,8 +106,66 @@ all become non-zero when at least one of them previously had the value 0.
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must be either 0 (capabilities are cleared) or 1 (capabilities are kept).
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.TP
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.B PR_GET_KEEPCAPS
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(Since Linux 2.2.18)
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Return (as the function result) the current state of the calling process's
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"keep capabilities" flag.
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.TP
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.B PR_SET_TIMING
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(Since Linux 2.6.0-test4)
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Set whether to use (normal, traditional) statistical process timing or
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accurate timestamp based process timing, by passing \fBPR_TIMING_STATISTICAL\fP
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or \fBPR_TIMING_TIMESTAMP\fP to \fIarg2\fP.
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.TP
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.B PR_GET_TIMING
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(Since Linux 2.6.0-test4)
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Return (as the function result) which process timing method is currently
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in use.
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.TP
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.B PR_SET_NAME
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(Since Linux 2.6.9)
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Set the process name for the current process to \fIarg2\fP.
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.TP
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.B PR_GET_NAME
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(Since Linux 2.6.11)
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Get the process name for the current process from \fIarg2\fP.
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.TP
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.B PR_SET_UNALIGN
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(Since Linux 2.3.48, only on parisc and ia64)
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Set unaligned access control bits to \fIarg2\fP. Pass
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\fBPR_UNALIGN_NOPRINT\fP to silently fix up unaligned user accesses, or
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\fBPR_UNALIGN_SIGBUS\fP to generate SIGBUS on unaligned user access.
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.TP
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.B PR_GET_UNALIGN
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(Since Linux 2.3.48, only on parisc and ia64)
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Get unaligned access control bits from \fIarg2\fP.
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.TP
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.B PR_SET_FPEMU
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(Since Linux 2.4.18, 2.5.9, only on ia64)
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Set floating-point emulation control bits to \fIarg2\fP.
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Pass \fBPR_FPEMU_NOPRINT\fP to silently emulate fp operations accesses, or
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\fBPR_FPEMU_SIGFPE\fP to not emulate fp operations and send SIGFPE instead.
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.TP
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.B PR_GET_FPEMU
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(Since Linux 2.4.18, 2.5.9, only on ia64)
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Get floating-point emulation control bits from \fIarg2\fP.
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.TP
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.B PR_SET_FPEXC
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(Since Linux 2.4.21, 2.5.32, only on powerpc)
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Set floating-point exception mode to \fIarg2\fP. Pass
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\fBPR_FP_EXC_SW_ENABLE\fP to use FPEXC for FP exception enables,
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\fBPR_FP_EXC_DIV\fP for floating point divide by zero,
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\fBPR_FP_EXC_OVF\fP for floating point overflow,
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\fBPR_FP_EXC_UND\fP for floating point underflow,
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\fBPR_FP_EXC_RES\fP for floating point inexact result,
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\fBPR_FP_EXC_INV\fP for floating point invalid operation,
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\fBPR_FP_EXC_DISABLED\fP for FP exceptions disabled,
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\fBPR_FP_EXC_NONRECOV\fP for async non-recoverable exception mode,
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\fBPR_FP_EXC_ASYNC\fP for async recoverable exception mode,
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\fBPR_FP_EXC_PRECISE\fP for precise exception mode.
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.TP
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.B PR_GET_FPEXC
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(Since Linux 2.4.21, 2.5.32, only on powerpc)
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Get floating-point exception mode from \fIarg2\fP.
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.SH "RETURN VALUE"
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.B PR_GET_DUMPABLE
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and
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