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Diffstat (limited to 'man/sd_booted.3')
| -rw-r--r-- | man/sd_booted.3 | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/man/sd_booted.3 b/man/sd_booted.3 new file mode 100644 index 0000000000..a8e48fb877 --- /dev/null +++ b/man/sd_booted.3 @@ -0,0 +1,67 @@ +'\" t +.TH "SD_BOOTED" "3" "" "systemd 208" "sd_booted" +.\" ----------------------------------------------------------------- +.\" * Define some portability stuff +.\" ----------------------------------------------------------------- +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" http://bugs.debian.org/507673 +.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.ie \n(.g .ds Aq \(aq +.el .ds Aq ' +.\" ----------------------------------------------------------------- +.\" * set default formatting +.\" ----------------------------------------------------------------- +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.\" ----------------------------------------------------------------- +.\" * MAIN CONTENT STARTS HERE * +.\" ----------------------------------------------------------------- +.SH "NAME" +sd_booted \- Test whether the system is running the systemd init system +.SH "SYNOPSIS" +.sp +.ft B +.nf +#include <systemd/sd\-daemon\&.h> +.fi +.ft +.HP \w'int\ sd_booted('u +.BI "int sd_booted(void);" +.SH "DESCRIPTION" +.PP +\fBsd_booted()\fR +checks whether the system was booted up using the systemd init system\&. +.SH "RETURN VALUE" +.PP +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\&. +.SH "NOTES" +.PP +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\&. +.PP +Internally, this function checks whether the directory +/run/systemd/system/ +exists\&. A simple check like this can also be implemented trivially in shell or any other language\&. +.PP +For details about the algorithm check the liberally licensed reference implementation sources: +\m[blue]\fB\%http://cgit.freedesktop.org/systemd/systemd/plain/src/libsystemd-daemon/sd-daemon.c\fR\m[] +and +\m[blue]\fB\%http://cgit.freedesktop.org/systemd/systemd/plain/src/systemd/sd-daemon.h\fR\m[] +.PP +\fBsd_booted()\fR +is implemented in the reference implementation\*(Aqs +sd\-daemon\&.c +and +sd\-daemon\&.h +files\&. These interfaces are available as shared library, which can be compiled and linked to with the +\fBlibsystemd\-daemon\fR\ \&\fBpkg-config\fR(1) +file\&. Alternatively, applications consuming these APIs may copy the implementation into their source tree\&. For more details about the reference implementation see +\fBsd-daemon\fR(3)\&. +.PP +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\&. +.SH "SEE ALSO" +.PP +\fBsystemd\fR(1), +\fBsd-daemon\fR(3) |