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-rw-r--r--src/state/hpr_wall.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/src/state/hpr_wall.c b/src/state/hpr_wall.c
new file mode 100644
index 0000000..cc6da5e
--- /dev/null
+++ b/src/state/hpr_wall.c
@@ -0,0 +1,47 @@
+/* ISC license. */
+
+#include <string.h>
+#include <errno.h>
+#include <utmpx.h>
+
+#include <skalibs/posixishard.h>
+#include <skalibs/allreadwrite.h>
+#include <skalibs/strerr2.h>
+#include <skalibs/djbunix.h>
+
+#include "hpr.h"
+
+#ifndef UT_LINESIZE
+#define UT_LINESIZE 32
+#endif
+
+void hpr_wall (char const *s)
+{
+ size_t n = strlen(s) ;
+ char tty[10 + UT_LINESIZE] = "/dev/" ;
+ char msg[n+1] ;
+ memcpy(msg, s, n) ;
+ msg[n++] = '\n' ;
+ setutxent() ;
+ for (;;)
+ {
+ size_t linelen, idlen ;
+ struct utmpx *utx ;
+ int fd ;
+ errno = 0 ;
+ utx = getutxent() ;
+ if (!utx) break ;
+ if (utx->ut_type != USER_PROCESS) continue ;
+ linelen = strnlen(utx->ut_line, UT_LINESIZE) ;
+ idlen = strnlen(utx->ut_id, 4) ;
+ memcpy(tty + 5, utx->ut_line, linelen) ;
+ memcpy(tty + 5 + linelen, utx->ut_id, idlen) ;
+ tty[5 + linelen + idlen] = 0 ;
+ fd = open_append(tty) ;
+ if (fd == -1) continue ;
+ allwrite(fd, msg, n) ;
+ fd_close(fd) ;
+ }
+ if (errno) strerr_warnwu1sys("getutxent") ;
+ endutxent() ;
+}