'\" t .TH "SD_BUS_CAN_SEND" "3" "" "systemd 256.6" "sd_bus_can_send" .\" ----------------------------------------------------------------- .\" * 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_bus_can_send \- Check which types can be sent over a bus object .SH "SYNOPSIS" .sp .ft B .nf #include .fi .ft .HP \w'void\ sd_bus_can_send('u .BI "void sd_bus_can_send(sd_bus\ *" "bus" ", char\ " "type" ");" .SH "DESCRIPTION" .PP \fBsd_bus_can_send()\fR is mostly used for checking if file descriptor passing is available on the given bus\&. \fItype\fR can be any of the \fBSD_BUS_TYPE\fR constants\&. .SH "RETURN VALUE" .PP On failure, \fBsd_bus_can_send()\fR returns a negative errno\-style error code\&. If values of the given type can be sent over the given bus, it returns a positive integer\&. Otherwise, it returns zero\&. .SS "Errors" .PP Returned errors may indicate the following problems: .PP \fB\-ENOPKG\fR .RS 4 The bus object \fIbus\fR could not be resolved\&. .RE .PP \fB\-ENOTCONN\fR .RS 4 The input parameter \fIbus\fR is \fBNULL\fR or the bus is not connected\&. .RE .PP \fB\-ECHILD\fR .RS 4 The bus object \fIbus\fR was created in a different process\&. .RE .SH "NOTES" .PP Functions described here are available as a shared library, which can be compiled against and linked to with the \fBlibsystemd\fR\ \&\fBpkg-config\fR(1) file\&. .PP The code described here uses \fBgetenv\fR(3), which is declared to be not multi\-thread\-safe\&. This means that the code calling the functions described here must not call \fBsetenv\fR(3) from a parallel thread\&. It is recommended to only do calls to \fBsetenv()\fR from an early phase of the program when no other threads have been started\&. .SH "HISTORY" .PP \fBsd_bus_can_send()\fR was added in version 221\&. .SH "SEE ALSO" .PP \fBsystemd\fR(1), \fBsd-bus\fR(3)