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DEVCTL_NOTIFY(9) FreeBSD Kernel Developer's Manual DEVCTL_NOTIFY(9) NAME devctl_notify - Send a message, via devctl, to userland SYNOPSIS #include <sys/devctl.h> void devctl_notify(const char *system, const char *subsystem, const char *type, const char *data); DESCRIPTION Send a notification to user land via devctl(4). See devctl(4) for the format of these messages. The devctl_notify function creates a string using the following template: snprintf(buffer, sizeof(buffer), "!system=%s subsystem=%s type=%s", system, subsystem, type); The system, subsystem, and type pointers cannot be NULL. The data argument may be NULL (for no additions) or a message formatted properly for devctl(4). A space will be added to the above template and this argument copied verbatim to form the message passed to userland. Senders should balance between only passing data that userland can not discover itself and sending all the data userland will want to use to decide what to do with the message. The current total message length limit is just under 1kb. Senders should try to remain well below this limit. SEE ALSO devctl(4), devd(8) AUTHORS This manual page was written by M. Warner Losh FreeBSD 14.1-RELEASE-p8 September 22, 2020 FreeBSD 14.1-RELEASE-p8