| SD_BUS_MESSAGE_VERIFY_TYPE(3) | sd_bus_message_verify_type | SD_BUS_MESSAGE_VERIFY_TYPE(3) |
.SH "NAME" sd_bus_message_verify_type - Check if the message has
specified type at the current location
.SH "SYNOPSIS"
#include <systemd/sd-bus.h>
.HP 744u int
sd_bus_message_verify_type(sd_bus_message *m,
char type,
const char* contents);
.SH "DESCRIPTION"
.PP sd_bus_message_verify_type() checks if the complete type at the
current location in the message m matches the specified type
and contents. If non-zero, parameter type must be one of the
types specified in sd_bus_message_append(3). If non-null, parameter
contents must be a valid sequence of complete types. If both
type and contents are specified type must be a
container type.
.PP If type is specified, the type in the message must match. If
contents is specified, the type in the message must be a container
type with this signature.
.SH "RETURN VALUE"
.PP On success, this call returns true if the type matches and zero if not
(the message m contains different data or the end of the message has
been reached). On failure, it returns a negative errno-style error code.
.SS "Errors"
.PP Returned errors may indicate the following problems:
.PP -EINVAL
m or both type and contents are NULL.
Arguments do not satisfy other constraints listed above.
.RE
.PP -EPERM
Message m is not sealed.
.RE
.SH "NOTES"
.PP Functions described here are available as a shared library, which can be
compiled against and linked to with the
libsystemd pkg-config(1) file.
.PP All functions listed here are thread-agnostic and only a single thread
may operate on a given object at any given time. Different threads may
access the same object at different times. Multiple independent objects may
be used from different threads in parallel.
.PP The code described here uses getenv(3), which is declared to be
not multi-thread-safe. This means that the code calling the functions
described here must not call setenv(3) from a parallel thread. It is
recommended to only do calls to setenv() from an early phase of the
program when no other threads have been started.
.SH "SEE ALSO"
| systemd 262.2 |