From 8a6eaed305dbe4ec6a87fe37000f7461bf563937 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Wed, 18 Jun 2025 18:58:34 +0000
Subject:  Add a lot of stuff, implement basic service_start

Signed-off-by: Laurent Bercot <ska@appnovation.com>
---
 src/libs6f/s6f_report_state_change.c | 64 ++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 src/libs6f/s6f_report_state_change.c

(limited to 'src/libs6f/s6f_report_state_change.c')

diff --git a/src/libs6f/s6f_report_state_change.c b/src/libs6f/s6f_report_state_change.c
new file mode 100644
index 0000000..70d2cd1
--- /dev/null
+++ b/src/libs6f/s6f_report_state_change.c
@@ -0,0 +1,64 @@
+/* ISC license. */
+
+#include <string.h>
+
+#include <skalibs/prog.h>
+#include <skalibs/strerr.h>
+#include <skalibs/djbunix.h>
+
+#include <s6-rc/s6rc-db.h>
+
+#include "s6f.h"
+
+void s6f_report_state_change (uint32_t n, unsigned char const *oldstate, unsigned char const *newstate, char const *compiled)
+{
+  if (!memcmp(oldstate, newstate, n))
+  {
+    if (buffer_puts(buffer_1, PROG) < 0
+     || buffer_puts(buffer_1, ": info: ") < 0
+     || buffer_putsflush(buffer_1, "the global state has not changed.\n") < 0)
+      strerr_diefu1sys(111, "write to stdout") ;
+  }
+  else
+  {
+    s6rc_db_t db ;
+    int fd = openc_readb(compiled) ;
+    if (fd == -1) strerr_diefu2sys(111, "open ", compiled) ;
+    if (!s6rc_db_read_sizes(fd, &db))
+      strerr_diefu2sys(111, "read db sizes for ", compiled) ;
+
+    {
+      s6rc_service_t serviceblob[n] ;
+      char const *argvblob[db.nargvs] ;
+      uint32_t depsblob[db.ndeps << 1] ;
+      uint32_t producersblob[db.nproducers] ;
+      int r ;
+      char stringblob[db.stringlen] ;
+      db.services = serviceblob ;
+      db.argvs = argvblob ;
+      db.deps = depsblob ;
+      db.producers = producersblob ;
+      db.string = stringblob ;
+
+      r = s6rc_db_read(fd, &db) ;
+      if (r < 0) strerr_diefu3sys(111, "read ", compiled, "/db") ;
+      if (!r) strerr_dief3x(4, "invalid service database in ", compiled, "/db") ;
+
+      if (buffer_puts(buffer_1, PROG) < 0
+       || buffer_puts(buffer_1, ": info: the following atomic services have changed state:\n") < 0)
+        strerr_diefu1sys(111, "write to stdout") ;
+      for (uint32_t i = 0 ; i < n ; i++)
+      {
+        if ((oldstate[i] & 1) != (newstate[i] & 1))
+        {
+          if (buffer_puts(buffer_1, db.string + db.services[i].name) < 0
+           || buffer_put(buffer_1, "\n", 1) < 1)
+            strerr_diefu1sys(111, "write to stdout") ;
+        }
+      }
+      if (!buffer_flush(buffer_1))
+        strerr_diefu1sys(111, "write to stdout") ;
+    }
+    fd_close(fd) ;
+  }
+}
-- 
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