man/sd_booted.3

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   2 .TH "SD_BOOTED" "3" "" "systemd 217" "sd_booted"
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  22 .SH "NAME"
  23 sd_booted \- Test whether the system is running the systemd init system
  24 .SH "SYNOPSIS"
  25 .sp
  26 .ft B
  27 .nf
  28 #include <systemd/sd\-daemon\&.h>
  29 .fi
  30 .ft
  31 .HP \w'int\ sd_booted('u
  32 .BI "int sd_booted(void);"
  33 .SH "DESCRIPTION"
  34 .PP
  35 \fBsd_booted()\fR
  36 checks whether the system was booted up using the systemd init system\&.
  37 .SH "RETURN VALUE"
  38 .PP
  39 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\&.
  40 .SH "NOTES"
  41 .PP
  42 These APIs are implemented as a shared library, which can be compiled and linked to with the
  43 \fBlibsystemd\fR\ \&\fBpkg-config\fR(1)
  44 file\&.
  45 .PP
  46 Internally, this function checks whether the directory
  47 /run/systemd/system/
  48 exists\&. A simple check like this can also be implemented trivially in shell or any other language\&.
  49 .SH "SEE ALSO"
  50 .PP
  51 \fBsystemd\fR(1),
  52 \fBsd-daemon\fR(3)