FIFO existence is used to test for a running kernel.

[egate.git] / kernel / eti.c

diff --git a/kernel/eti.c b/kernel/eti.c
index 183f0e3..0398f56 100644 (file)
--- a/kernel/eti.c
+++ b/kernel/eti.c
@@ -2,7 +2,10 @@
  * Europagate, 1995
  *
  * $Log: eti.c,v $
- * Revision 1.2  1995/03/27 12:51:05  adam
+ * Revision 1.3  1995/03/28 08:01:23  adam
+ * FIFO existence is used to test for a running kernel.
+ *
+ * Revision 1.2  1995/03/27  12:51:05  adam
  * New log level in use: GW_LOG_ERRNO.
  *
  * Revision 1.1  1995/03/27  08:24:00  adam
@@ -18,6 +21,8 @@
 #include <string.h>
 #include <unistd.h>
 #include <fcntl.h>
+#include <setjmp.h>
+#include <signal.h>
 
 #include <gw-log.h>
 #include <gw-db.h>
@@ -27,6 +32,12 @@
 static char line_buf[LINE_MAX+1];
 
 static char *module = "eti";
+static jmp_buf retry_jmp;
+
+static void pipe_handle (int dummy)
+{
+    longjmp (retry_jmp, 1);
+}
 
 static int email_header (FILE *inf, char *from_str, char *subject_str)
 {
@@ -45,17 +56,39 @@ static int email_header (FILE *inf, char *from_str, char *subject_str)
     return 1;
 }
 
-static int kernel_active (int id)
+static void start_kernel (int argc, char **argv, int id)
 {
-    char active_name[1024];
-    int fd;
+    pid_t pid;
+    int i;
+    char **argv_p;
+    char userid_option[20];
 
-    sprintf (active_name, "kernel.pid.%d", id);
-    fd = open (active_name, O_RDONLY);
-    if (fd == -1)
-        return 0;
-    close (fd);
-    return 1;
+    argv_p = malloc (sizeof(*argv_p)*(argc+2));
+    if (!argv_p)
+    {
+       gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module, "malloc fail");
+       exit (1);
+    }
+    argv_p[0] = "kernel";
+    for (i = 1; i<argc; i++)
+        argv_p[i] = argv[i];
+    sprintf (userid_option, "-i%d", id);
+    argv_p[i++] = userid_option;
+    argv_p[i++] = NULL;
+
+    gw_log (GW_LOG_DEBUG, module, "Starting kernel");
+    pid = fork ();
+    if (pid == -1)
+    {
+       gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module, "fork");
+       exit (1);
+    }
+    if (!pid)
+    {
+        execvp ("kernel", argv_p);
+       gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module, "execvp");
+       exit (1);
+    }
 }
 
 int main (int argc, char **argv)
@@ -69,6 +102,7 @@ int main (int argc, char **argv)
     size_t info_length;
     int  id;
     int  r;
+    static int pass = 0;
     char fifo_client_name[1024];
     char fifo_server_name[1024];
 
@@ -112,48 +146,42 @@ int main (int argc, char **argv)
     sprintf (fifo_client_name, "fifo.c.%d", id);
 
     gip = gipc_initialize (fifo_client_name);
-    if (kernel_active (id))
+
+    signal (SIGPIPE, pipe_handle);
+    setjmp (retry_jmp);
+    ++pass;
+    gw_log (GW_LOG_DEBUG, module, "Pass %d", pass);
+    if (pass == 1)
+        r = gipc_open (gip, fifo_server_name, 0);
+    else if (pass == 2)
     {
-        gw_log (GW_LOG_DEBUG, module, "Kernel already active");
-        gipc_open (gip, fifo_server_name, 0);
+        gipc_close (gip);
+        start_kernel (argc, argv, id);
+        r = gipc_open (gip, fifo_server_name, 1);
     }
-    else
+    else if (pass == 3)
     {
-        pid_t pid;
-       int i;
-       char **argv_p;
-       char userid_option[20];
-
-        argv_p = malloc (sizeof(*argv_p)*(argc+2));
-       if (!argv_p)
+        gw_log (GW_LOG_FATAL, module, "Cannot start kernel");
+       exit (1);
+    }
+    if (r < 0)
+        if (r == -2)
        {
-           gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module, "Malloc fail");
-           exit (1);
+           gw_log (GW_LOG_WARN|GW_LOG_ERRNO, module, "r==-2");
+           longjmp (retry_jmp, 1);
        }
-       argv_p[0] = "kernel";
-        for (i = 1; i<argc; i++)
-            argv_p[i] = argv[i];
-       sprintf (userid_option, "-i%d", id);
-       argv_p[i++] = userid_option;
-       argv_p[i++] = NULL;
-
-        gw_log (GW_LOG_DEBUG, module, "Kernel not active");
-       pid = fork ();
-       if (pid == -1)
+       else if (r == -1)
        {
-           gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module, "fork");
-           exit (1);
+           gw_log (GW_LOG_WARN|GW_LOG_ERRNO, module, "r==-1");
+           longjmp (retry_jmp, 1);
        }
-       if (!pid)
+       else
        {
-            execvp ("kernel", argv_p);
-           gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module, "execvp");
+           gw_log (GW_LOG_FATAL|GW_LOG_ERRNO, module, "gipc_open");
            exit (1);
        }
-        gipc_open (gip, fifo_server_name, 1);
-    }
     /* deliver message ... */
-    gw_log (GW_LOG_DEBUG, module, "Deliver mail header");
+    gw_log (GW_LOG_DEBUG, module, "Delivering mail header");
     gip_wline (gip, "mail\n");
     gip_wline (gip, "From ");
     gip_wline (gip, from_str);
@@ -165,7 +193,7 @@ int main (int argc, char **argv)
        gip_wline (gip, "\n");
     }
     gip_wline (gip, "\n");
-    gw_log (GW_LOG_DEBUG, module, "Deliver mail body");
+    gw_log (GW_LOG_DEBUG, module, "Delivering mail body");
     while (fgets (line_str, LINE_MAX, stdin))
         gip_wline (gip, line_str);
     gip_wline (gip, "\001");