libusb(3): Ignore SIGPIPE when initializing the LibUSB v1.0 API.

The LibUSB v1.0 emulation layer uses pipes internally to signal between
threads. When USB devices are reset, as part of loading firmware, SIGPIPE
may happen, and that is expected and should be ignored.

PR:		261891
MFC after:	1 week
Sponsored by:	NVIDIA Networking

lib/libusb/libusb10.c

@@ -34,6 +34,7 @@
 #include <errno.h>
 #include <poll.h>
 #include <pthread.h>
+#include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -226,6 +227,8 @@ libusb_init(libusb_context **context)
 
 	DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_init complete");
 
+	signal(SIGPIPE, SIG_IGN);
+
 	return (0);
 }
 

lib/libusb/libusb_global_linux.h

@@ -50,6 +50,7 @@
 #include <fcntl.h>
 #include <limits.h>
 #include <setjmp.h>
+#include <signal.h>
 #include <pthread.h>
 #include <sys/queue.h>
 #include <sys/ioctl.h>