wall: new applet

text	   data	    bss	    dec	    hex	filename
     81	      0	      0	     81	     51	miscutils/wall.o

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/miscutils/wall.c b/miscutils/wall.c
new file mode 100644
index 000000000..2dbab60b4
--- /dev/null
+++ b/miscutils/wall.c
@@ -0,0 +1,36 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * wall - write a message to all logged-in users
+ * Copyright (c) 2009 Bernhard Reutner-Fischer
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+#include <utmp.h>
+
+int wall_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int wall_main(int argc UNUSED_PARAM, char **argv)
+{
+	struct utmp *ut;
+	char *msg;
+	int fd = argv[1] ? xopen(argv[1], O_RDONLY) : STDIN_FILENO;
+
+	msg = xmalloc_read(fd, NULL);
+	if (ENABLE_FEATURE_CLEAN_UP && argv[1])
+		close(fd);
+	setutent();
+	while ((ut = getutent()) != NULL) {
+		char *line;
+		if (ut->ut_type != USER_PROCESS)
+			continue;
+		line = concat_path_file("/dev", ut->ut_line);
+		xopen_xwrite_close(line, msg);
+		free(line);
+	}
+	if (ENABLE_FEATURE_CLEAN_UP) {
+		endutent();
+		free(msg);
+	}
+	return EXIT_SUCCESS;
+}