2005-05-02 15:01:42 +02:00
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.\" svrctl.2
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.\"
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.\" Created: July, 1994 by Philip Homburg <philip@cs.vu.nl>
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.TH svrctl 2
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.SH NAME
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svrctl \- special server control functions
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.SH SYNOPSIS
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.nf
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.ft B
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#include <sys/svrctl.h>
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int svrctl(u32_t \fIrequest\fP, void *\fIdata\fP);
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.ft R
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.fi
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.SH DESCRIPTION
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.B Svrctl
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allows root to control the kernel in various ways, or implements some very
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2005-08-22 14:56:02 +02:00
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MINIX 3 specific system calls that don't deserve their own system call number.
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2005-05-02 15:01:42 +02:00
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.PP
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This system call makes it easy to add new ways of setting and getting kernel
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parameters, but at the same time, backwards compatibility is not guaranteed.
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Read the <sys/svrctl.h> include file to see what the struct's mentioned below
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look like. Most calls are root-only, unless specified otherwise.
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.PP
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The only way to know how to properly use these calls is to study the
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associated kernel or server code, or the programs that already use these
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calls.
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.PP
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Current requests are:
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.TP 5
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.B MMSIGNON
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Inform MM that the current process wants to become a server.
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.TP
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.B MMSWAPON
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Instruct MM to mount a file or device as swapspace.
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.TP
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.B MMSWAPOFF
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Tell MM to stop using swapspace.
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.TP
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.B FSSIGNON
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Register a new device with FS.
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.ig
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.TP
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.B FSDEVMAP
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Translate a device number to a task number, minor device pair using a
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\fBstruct fsdevmap\fP
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..
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.TP
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.B SYSSIGNON
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Inform the kernel that the process want to become a server.
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The processes task number is filled-in in a \fBstruct systaskinfo\fP.
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.TP
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.B SYSGETENV
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Request the value of one or all boot parameters. Can be used by non-root.
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.SH "RETURN VALUES"
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.B Svrctl
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returns 0 upon success and -1 upon failure.
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.SH AUTHOR
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Philip Homburg <philip@cs.vu.nl>
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