Add an internal-representation no-op function.

[u/mdw/catacomb] / pixie.c

diff --git a/pixie.c b/pixie.c
index 441b732..363f833 100644 (file)
--- a/pixie.c
+++ b/pixie.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: pixie.c,v 1.5 2000/07/29 22:05:22 mdw Exp $
+ * $Id: pixie.c,v 1.10 2001/02/21 20:03:54 mdw Exp $
  *
  * Passphrase pixie for Catacomb
  *
@@ -30,6 +30,24 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: pixie.c,v $
+ * Revision 1.10  2001/02/21 20:03:54  mdw
+ * Handle select errors (by bombing out).  Cosmetic tweak.
+ *
+ * Revision 1.9  2001/02/03 16:06:44  mdw
+ * Don't set a handler for @SIGINT@ if it's ignored at startup.  Add some
+ * error handling for the @select@ loop.
+ *
+ * Revision 1.8  2001/01/25 22:19:31  mdw
+ * Make flags be unsigned.
+ *
+ * Revision 1.7  2000/12/06 20:33:27  mdw
+ * Make flags be macros rather than enumerations, to ensure that they're
+ * unsigned.
+ *
+ * Revision 1.6  2000/10/08 12:06:46  mdw
+ * Change size passed to socket function to be a @size_t@.  Insert missing
+ * type name for flag declaration.
+ *
  * Revision 1.5  2000/07/29 22:05:22  mdw
  * Miscellaneous tidyings:
  *
@@ -124,10 +142,8 @@ static const char *command = 0;
 static lmem lm;
 static unsigned flags = 0;
 
-enum {
-  F_SYSLOG = 1,
-  F_FETCH = 2
-};
+#define F_SYSLOG 1u
+#define F_FETCH 2u
 
 /*----- Event logging -----------------------------------------------------*/
 
@@ -597,7 +613,7 @@ typedef struct pixserv {
   unsigned f;
 } pixserv;
 
-enum { px_stdin = 1 };
+#define px_stdin 1u
 
 #define PIXSERV_TIMEOUT 30
 
@@ -874,7 +890,7 @@ static void pixserv_accept(int fd, unsigned mode, void *p)
 {
   int nfd;
   struct sockaddr_un sun;
-  int sunsz = sizeof(sun);
+  size_t sunsz = sizeof(sun);
 
   if (mode != SEL_READ)
     return;
@@ -1061,8 +1077,10 @@ static void pix_setup(struct sockaddr_un *sun, size_t sz)
 /* --- Variables --- */
 
 static selbuf c_server, c_client;
-static c_flags = 0;
-enum { cf_uclose = 1, cf_sclose = 2 };
+static unsigned c_flags = 0;
+
+#define cf_uclose 1u
+#define cf_sclose 2u
 
 /* --- Line handler functions --- */
 
@@ -1089,8 +1107,8 @@ static void c_sline(char *s, void *p)
       selbuf_destroy(&c_client);
     }
     exit(0);
-  } else 
-    puts(s);
+  }
+  puts(s);
 }
 
 /* --- @pix_client@ --- *
@@ -1140,8 +1158,10 @@ static void pix_client(struct sockaddr_un *sun, size_t sz, char *argv[])
 
   /* --- And repeat --- */
 
-  for (;;)
-    sel_select(&sel);
+  for (;;) {
+    if (sel_select(&sel))
+      die(EXIT_FAILURE, "select error: %s", strerror(errno));
+  }
 }
 
 /*----- Main code ---------------------------------------------------------*/
@@ -1224,13 +1244,11 @@ int main(int argc, char *argv[])
   size_t sz;
   unsigned f = 0;
 
-  enum {
-    f_bogus = 1,
-    f_client = 2,
-    f_stdin = 4,
-    f_daemon = 8,
-    f_syslog = 16
-  };
+#define f_bogus 1u
+#define f_client 2u
+#define f_stdin 4u
+#define f_daemon 8u
+#define f_syslog 16u
 
   /* --- Initialize libraries --- */
 
@@ -1380,8 +1398,11 @@ int main(int argc, char *argv[])
 
   {
     static sig sigint, sigterm, sigquit, sighup;
+    struct sigaction sa;
     sig_init(&sel);
-    sig_add(&sigint, SIGINT, pix_sigdie, 0);
+    sigaction(SIGINT, 0, &sa);
+    if (sa.sa_handler != SIG_IGN)
+      sig_add(&sigint, SIGINT, pix_sigdie, 0);
     sig_add(&sigterm, SIGTERM, pix_sigdie, 0);
     sig_add(&sigquit, SIGQUIT, pix_sigflush, 0);
     sig_add(&sighup, SIGHUP, pix_sigflush, 0);
@@ -1422,14 +1443,28 @@ int main(int argc, char *argv[])
     chdir("/");
     setsid();
 
-    if (fork() > 0)
+    if (fork() >= 0)
       _exit(0);
   }
 
   if (verbose)
     log("initialized ok");
-  for (;;)
-    sel_select(&sel);
+
+  {
+    int selerr = 0;
+    for (;;) {
+      if (!sel_select(&sel))
+       selerr = 0;
+      else if (errno != EINTR && errno != EAGAIN) {
+       log("error from select: %s", strerror(errno));
+       selerr++;
+       if (selerr > 8) {
+         log("too many consecutive select errors: bailing out");
+         exit(EXIT_FAILURE);
+       }
+      }
+    }
+  }
   return (0);
 }