| 1 | .\" svrctl.2
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| 2 | .\"
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| 3 | .\" Created: July, 1994 by Philip Homburg <philip@cs.vu.nl>
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| 4 | .TH svrctl 2
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| 5 | .SH NAME
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| 6 | svrctl \- special server control functions
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| 7 | .SH SYNOPSIS
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| 8 | .nf
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| 9 | .ft B
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| 10 | #include <sys/svrctl.h>
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| 11 |
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| 12 | int svrctl(u32_t \fIrequest\fP, void *\fIdata\fP);
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| 13 | .ft R
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| 14 | .fi
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| 15 | .SH DESCRIPTION
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| 16 | .B Svrctl
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| 17 | allows root to control the kernel in various ways, or implements some very
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| 18 | MINIX 3 specific system calls that don't deserve their own system call number.
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| 19 | .PP
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| 20 | This system call makes it easy to add new ways of setting and getting kernel
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| 21 | parameters, but at the same time, backwards compatibility is not guaranteed.
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| 22 | Read the <sys/svrctl.h> include file to see what the struct's mentioned below
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| 23 | look like. Most calls are root-only, unless specified otherwise.
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| 24 | .PP
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| 25 | The only way to know how to properly use these calls is to study the
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| 26 | associated kernel or server code, or the programs that already use these
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| 27 | calls.
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| 28 | .PP
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| 29 | Current requests are:
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| 30 | .TP 5
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| 31 | .B MMSIGNON
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| 32 | Inform MM that the current process wants to become a server.
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| 33 | .TP
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| 34 | .B MMSWAPON
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| 35 | Instruct MM to mount a file or device as swapspace.
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| 36 | .TP
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| 37 | .B MMSWAPOFF
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| 38 | Tell MM to stop using swapspace.
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| 39 | .TP
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| 40 | .B FSSIGNON
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| 41 | Register a new device with FS.
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| 42 | .ig
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| 43 | .TP
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| 44 | .B FSDEVMAP
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| 45 | Translate a device number to a task number, minor device pair using a
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| 46 | \fBstruct fsdevmap\fP
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| 47 | ..
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| 48 | .TP
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| 49 | .B SYSSIGNON
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| 50 | Inform the kernel that the process want to become a server.
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| 51 | The processes task number is filled-in in a \fBstruct systaskinfo\fP.
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| 52 | .TP
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| 53 | .B SYSGETENV
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| 54 | Request the value of one or all boot parameters. Can be used by non-root.
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| 55 | .SH "RETURN VALUES"
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| 56 | .B Svrctl
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| 57 | returns 0 upon success and -1 upon failure.
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| 58 | .SH AUTHOR
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| 59 | Philip Homburg <philip@cs.vu.nl>
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