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68 lines
2.9 KiB
Groff
68 lines
2.9 KiB
Groff
'\" t
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.TH "SD_BOOTED" "3" "" "systemd 208" "sd_booted"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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sd_booted \- Test whether the system is running the systemd init system
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.SH "SYNOPSIS"
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.sp
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.ft B
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.nf
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#include <systemd/sd\-daemon\&.h>
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.fi
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.ft
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.HP \w'int\ sd_booted('u
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.BI "int sd_booted(void);"
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.SH "DESCRIPTION"
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.PP
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\fBsd_booted()\fR
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checks whether the system was booted up using the systemd init system\&.
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.SH "RETURN VALUE"
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.PP
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On failure, this call returns a negative errno\-style error code\&. If the system was booted up with systemd as init system, this call returns a positive return value, zero otherwise\&.
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.SH "NOTES"
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.PP
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This function is provided by the reference implementation of APIs for new\-style daemons and distributed with the systemd package\&. The algorithm it implements is simple, and can easily be reimplemented in daemons if it is important to support this interface without using the reference implementation\&.
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.PP
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Internally, this function checks whether the directory
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/run/systemd/system/
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exists\&. A simple check like this can also be implemented trivially in shell or any other language\&.
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.PP
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For details about the algorithm check the liberally licensed reference implementation sources:
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\m[blue]\fB\%http://cgit.freedesktop.org/systemd/systemd/plain/src/libsystemd-daemon/sd-daemon.c\fR\m[]
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and
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\m[blue]\fB\%http://cgit.freedesktop.org/systemd/systemd/plain/src/systemd/sd-daemon.h\fR\m[]
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.PP
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\fBsd_booted()\fR
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is implemented in the reference implementation\*(Aqs
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sd\-daemon\&.c
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and
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sd\-daemon\&.h
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files\&. These interfaces are available as shared library, which can be compiled and linked to with the
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\fBlibsystemd\-daemon\fR\ \&\fBpkg-config\fR(1)
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file\&. Alternatively, applications consuming these APIs may copy the implementation into their source tree\&. For more details about the reference implementation see
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\fBsd-daemon\fR(3)\&.
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.PP
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If the reference implementation is used as drop\-in files and \-DDISABLE_SYSTEMD is set during compilation, this function will always return 0 and otherwise become a NOP\&.
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.SH "SEE ALSO"
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.PP
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\fBsystemd\fR(1),
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\fBsd-daemon\fR(3)
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