Testsuite: do not use trailing spaces in runtest

[users/heiko/exim.git] / test / src / server.c

diff --git a/test/src/server.c b/test/src/server.c
index a7e1d2b1d9df5defac1f2014ac9252b3d6b22e7d..ba731625b3733fca1234f280655e20568952bc96 100644 (file)
--- a/test/src/server.c
+++ b/test/src/server.c
@@ -26,9 +26,10 @@ on all interfaces, unless the option -noipv6 is given. */
 #include <netinet/in_systm.h>
 #include <netinet/in.h>
 #include <netinet/ip.h>
 #include <netinet/in_systm.h>
 #include <netinet/in.h>
 #include <netinet/ip.h>

+#include <netinet/tcp.h>

 
 #ifdef HAVE_NETINET_IP_VAR_H
 
 #ifdef HAVE_NETINET_IP_VAR_H

-#include <netinet/ip_var.h>
+# include <netinet/ip_var.h>

 #endif
 
 #include <netdb.h>
 #endif
 
 #include <netdb.h>


@@ -43,30 +44,41 @@ on all interfaces, unless the option -noipv6 is given. */
 #include <utime.h>
 
 #ifdef AF_INET6
 #include <utime.h>
 
 #ifdef AF_INET6

-#define HAVE_IPV6 1
+# define HAVE_IPV6 1

 #endif
 
 #ifndef S_ADDR_TYPE
 #endif
 
 #ifndef S_ADDR_TYPE

-#define S_ADDR_TYPE u_long
+# define S_ADDR_TYPE u_long
+#endif
+
+#ifndef CS
+# define CS (char *)
+# define CCS (const char *)

 #endif
 
 
 typedef struct line {
   struct line *next;
 #endif
 
 
 typedef struct line {
   struct line *next;

+  unsigned len;

   char line[1];
 } line;
 
   char line[1];
 } line;
 

+typedef unsigned BOOL;
+#define FALSE 0
+#define TRUE  1
+

 
 /*************************************************
 *            SIGALRM handler - crash out         *
 *************************************************/
 
 /*************************************************
 *            SIGALRM handler - crash out         *
 *************************************************/

+int tmo_noerror = 0;

 
 static void
 sigalrm_handler(int sig)
 {
 sig = sig;    /* Keep picky compilers happy */
 printf("\nServer timed out\n");
 
 static void
 sigalrm_handler(int sig)
 {
 sig = sig;    /* Keep picky compilers happy */
 printf("\nServer timed out\n");

-exit(99);
+exit(tmo_noerror ? 0 : 99);

 }
 
 
 }
 
 


@@ -119,6 +131,25 @@ return buffer;
 }
 
 
 }
 
 

+
+static void
+printit(char * s, int n)
+{
+while(n--)
+  {
+  unsigned char c = *s++;
+  if (c == '\\')
+    printf("\\\\");
+  else if (c >= ' ' && c <= '~')       /* assumes ascii */
+    putchar(c);
+  else
+    printf("\\x%02x", c);
+  }
+putchar('\n');
+}
+
+
+

 /*************************************************
 *                 Main Program                   *
 *************************************************/
 /*************************************************
 *                 Main Program                   *
 *************************************************/


@@ -139,6 +170,7 @@ int connection_count = 1;
 int count;
 int on = 1;
 int timeout = 5;
 int count;
 int on = 1;
 int timeout = 5;

+int initial_pause = 0, tfo = 0;

 int use_ipv4 = 1;
 int use_ipv6 = 1;
 int debug = 0;
 int use_ipv4 = 1;
 int use_ipv6 = 1;
 int debug = 0;


@@ -147,6 +179,8 @@ line *script = NULL;
 line *last = NULL;
 line *s;
 FILE *in, *out;
 line *last = NULL;
 line *s;
 FILE *in, *out;

+int linebuf = 1;
+char *pidfile = NULL;

 
 char *sockname = NULL;
 unsigned char buffer[10240];
 
 char *sockname = NULL;
 unsigned char buffer[10240];


@@ -171,16 +205,36 @@ int len = sizeof(accepted);
 
 
 /* Sort out the arguments */
 
 
 /* Sort out the arguments */

+if (argc > 1 && (!strcmp(argv[1], "--help") || !strcmp(argv[1], "-h")))
+  {
+  printf("Usage: %s [options] port|socket [connection count]\n", argv[0]);
+  puts("Options"
+       "\n\t-d       debug"
+       "\n\t-i n     n seconds initial delay"
+       "\n\t-noipv4  disable ipv4"
+       "\n\t-noipv6  disable ipv6"
+       "\n\t-oP file write PID to file"
+       "\n\t-t n     n seconds timeout"
+       "\n\t-tfo     enable TCP Fast Open"
+  );
+  exit(0);
+  }

 
 while (na < argc && argv[na][0] == '-')
   {
   if (strcmp(argv[na], "-d") == 0) debug = 1;
 
 while (na < argc && argv[na][0] == '-')
   {
   if (strcmp(argv[na], "-d") == 0) debug = 1;

-  else if (strcmp(argv[na], "-t") == 0) timeout = atoi(argv[++na]);
+  else if (strcmp(argv[na], "-tfo") == 0) tfo = 1;
+  else if (strcmp(argv[na], "-t") == 0)
+    {
+    if (tmo_noerror = ((timeout = atoi(argv[++na])) < 0)) timeout = -timeout;
+    }
+  else if (strcmp(argv[na], "-i") == 0) initial_pause = atoi(argv[++na]);

   else if (strcmp(argv[na], "-noipv4") == 0) use_ipv4 = 0;
   else if (strcmp(argv[na], "-noipv6") == 0) use_ipv6 = 0;
   else if (strcmp(argv[na], "-noipv4") == 0) use_ipv4 = 0;
   else if (strcmp(argv[na], "-noipv6") == 0) use_ipv6 = 0;

+  else if (strcmp(argv[na], "-oP") == 0) pidfile = argv[++na];

   else
     {
   else
     {

-    printf("server: unknown option %s\n", argv[na]);
+    printf("server: unknown option %s, try -h or --help\n", argv[na]);

     exit(1);
     }
   na++;
     exit(1);
     }
   na++;


@@ -209,11 +263,22 @@ na++;
 if (na < argc) connection_count = atoi(argv[na]);
 
 
 if (na < argc) connection_count = atoi(argv[na]);
 
 

+/* Initial pause (before creating listen sockets */
+if (initial_pause > 0)
+  {
+  if (debug)
+    printf("%ld: Inital pause of %d seconds\n", (long)time(NULL), initial_pause);
+  else
+    printf("Inital pause of %d seconds\n", initial_pause);
+  while (initial_pause > 0)
+    initial_pause = sleep(initial_pause);
+  }
+

 /* Create sockets */
 
 if (port == 0)  /* Unix domain */
   {
 /* Create sockets */
 
 if (port == 0)  /* Unix domain */
   {

-  if (debug) printf("Creating Unix domain socket\n");
+  if (debug) printf("%d: Creating Unix domain socket\n", time(NULL));

   listen_socket[udn] = socket(PF_UNIX, SOCK_STREAM, 0);
   if (listen_socket[udn] < 0)
     {
   listen_socket[udn] = socket(PF_UNIX, SOCK_STREAM, 0);
   if (listen_socket[udn] < 0)
     {


@@ -233,7 +298,15 @@ else
       printf("IPv6 socket creation failed: %s\n", strerror(errno));
       exit(1);
       }
       printf("IPv6 socket creation failed: %s\n", strerror(errno));
       exit(1);
       }

-
+#if defined(TCP_FASTOPEN) && !defined(__APPLE__)
+    if (tfo)
+      {
+      int backlog = 5;
+      if (setsockopt(listen_socket[v6n], IPPROTO_TCP, TCP_FASTOPEN,
+                    &backlog, sizeof(backlog)))
+       if (debug) printf("setsockopt TCP_FASTOPEN: %s\n", strerror(errno));
+      }
+#endif

     /* If this is an IPv6 wildcard socket, set IPV6_V6ONLY if that option is
     available. */
 
     /* If this is an IPv6 wildcard socket, set IPV6_V6ONLY if that option is
     available. */
 


@@ -257,6 +330,15 @@ else
       printf("IPv4 socket creation failed: %s\n", strerror(errno));
       exit(1);
       }
       printf("IPv4 socket creation failed: %s\n", strerror(errno));
       exit(1);
       }

+#if defined(TCP_FASTOPEN) && !defined(__APPLE__)
+    if (tfo)
+      {
+      int backlog = 5;
+      if (setsockopt(listen_socket[v4n], IPPROTO_TCP, TCP_FASTOPEN,
+                    &backlog, sizeof(backlog)))
+       if (debug) printf("setsockopt TCP_FASTOPEN: %s\n", strerror(errno));
+      }
+#endif

     }
   }
 
     }
   }
 


@@ -319,7 +401,7 @@ else
       sin6.sin6_addr = anyaddr6;
       if (bind(listen_socket[i], (struct sockaddr *)&sin6, sizeof(sin6)) < 0)
         {
       sin6.sin6_addr = anyaddr6;
       if (bind(listen_socket[i], (struct sockaddr *)&sin6, sizeof(sin6)) < 0)
         {

-        printf("IPv6 socket bind() failed: %s\n", strerror(errno));
+        printf("IPv6 socket bind(port %d) failed: %s\n", port, strerror(errno));

         exit(1);
         }
       }
         exit(1);
         }
       }


@@ -336,10 +418,9 @@ else
       sin4.sin_addr.s_addr = (S_ADDR_TYPE)INADDR_ANY;
       sin4.sin_port = htons(port);
       if (bind(listen_socket[i], (struct sockaddr *)&sin4, sizeof(sin4)) < 0)
       sin4.sin_addr.s_addr = (S_ADDR_TYPE)INADDR_ANY;
       sin4.sin_port = htons(port);
       if (bind(listen_socket[i], (struct sockaddr *)&sin4, sizeof(sin4)) < 0)

-        {

         if (listen_socket[v6n] < 0 || errno != EADDRINUSE)
           {
         if (listen_socket[v6n] < 0 || errno != EADDRINUSE)
           {

-          printf("IPv4 socket bind() failed: %s\n", strerror(errno));
+          printf("IPv4 socket bind(port %d) failed: %s\n", port, strerror(errno));

           exit(1);
           }
         else
           exit(1);
           }
         else


@@ -347,7 +428,6 @@ else
           close(listen_socket[i]);
           listen_socket[i] = -1;
           }
           close(listen_socket[i]);
           listen_socket[i] = -1;
           }

-        }

       }
     }
   }
       }
     }
   }


@@ -358,37 +438,75 @@ error because it means that the IPv6 socket will handle IPv4 connections. Don't
 output anything, because it will mess up the test output, which will be
 different for systems that do this and those that don't. */
 
 output anything, because it will mess up the test output, which will be
 different for systems that do this and those that don't. */
 

-for (i = 0; i <= skn; i++)
+for (i = 0; i <= skn; i++) if (listen_socket[i] >= 0)

   {
   {

-  if (listen_socket[i] >= 0 && listen(listen_socket[i], 5) < 0)
-    {
+  if (listen(listen_socket[i], 5) < 0)

     if (i != v4n || listen_socket[v6n] < 0 || errno != EADDRINUSE)
       {
       printf("listen() failed: %s\n", strerror(errno));
       exit(1);
       }
     if (i != v4n || listen_socket[v6n] < 0 || errno != EADDRINUSE)
       {
       printf("listen() failed: %s\n", strerror(errno));
       exit(1);
       }

-    }
+
+#if defined(TCP_FASTOPEN) && defined(__APPLE__)
+  if (  tfo
+     && setsockopt(listen_socket[v4n], IPPROTO_TCP, TCP_FASTOPEN, &on, sizeof(on))
+     && debug)
+      printf("setsockopt TCP_FASTOPEN: %s\n", strerror(errno));
+#endif

   }
 
 
   }
 
 

+if (pidfile)
+  {
+  FILE * p;
+  if (!(p = fopen(pidfile, "w")))
+    {
+    fprintf(stderr, "pidfile create failed: %s\n", strerror(errno));
+    exit(1);
+    }
+  fprintf(p, "%ld\n", (long)getpid());
+  fclose(p);
+  }
+

 /* This program handles only a fixed number of connections, in sequence. Before
 waiting for the first connection, read the standard input, which contains the
 script of things to do. A line containing "++++" is treated as end of file.
 This is so that the Perl driving script doesn't have to close the pipe -
 because that would cause it to wait for this process, which it doesn't yet want
 to do. The driving script adds the "++++" automatically - it doesn't actually
 /* This program handles only a fixed number of connections, in sequence. Before
 waiting for the first connection, read the standard input, which contains the
 script of things to do. A line containing "++++" is treated as end of file.
 This is so that the Perl driving script doesn't have to close the pipe -
 because that would cause it to wait for this process, which it doesn't yet want
 to do. The driving script adds the "++++" automatically - it doesn't actually

-appear in the test script. */
+appear in the test script. Within lines we interpret \xNN and \\ groups */

 
 

-while (fgets(buffer, sizeof(buffer), stdin) != NULL)
+while (fgets(CS buffer, sizeof(buffer), stdin) != NULL)

   {
   line *next;
   {
   line *next;

-  int n = (int)strlen(buffer);
+  char * d;
+  int n = (int)strlen(CS buffer);
+
+  if (n > 1 && buffer[0] == '>' && buffer[1] == '>')
+    linebuf = 0;

   while (n > 0 && isspace(buffer[n-1])) n--;
   buffer[n] = 0;
   while (n > 0 && isspace(buffer[n-1])) n--;
   buffer[n] = 0;

-  if (strcmp(buffer, "++++") == 0) break;
+  if (strcmp(CS buffer, "++++") == 0) break;

   next = malloc(sizeof(line) + n);
   next->next = NULL;
   next = malloc(sizeof(line) + n);
   next->next = NULL;

-  strcpy(next->line, buffer);
+  d = next->line;
+    {
+    char * s = CS buffer;
+    do
+      {
+      char ch;
+      char cl = *s;
+      if (cl == '\\' && (cl = *++s) == 'x')
+       {
+       if ((ch = *++s - '0') > 9 && (ch -= 'A'-'9'-1) > 15) ch -= 'a'-'A';
+       if ((cl = *++s - '0') > 9 && (cl -= 'A'-'9'-1) > 15) cl -= 'a'-'A';
+       cl |= ch << 4;
+       }
+      *d++ = cl;
+      }
+    while (*s++);
+    }
+  next->len = d - next->line - 1;

   if (last == NULL) script = last = next;
     else last->next = next;
   last = next;
   if (last == NULL) script = last = next;
     else last->next = next;
   last = next;


@@ -406,6 +524,11 @@ s = script;
 
 for (count = 0; count < connection_count; count++)
   {
 
 for (count = 0; count < connection_count; count++)
   {

+  struct {
+    int left;
+    BOOL in_use;
+  } content_length = { 0, FALSE };
+

   alarm(timeout);
   if (port <= 0)
     {
   alarm(timeout);
   if (port <= 0)
     {


@@ -431,8 +554,7 @@ for (count = 0; count < connection_count; count++)
       if (listen_socket[i] > max_socket) max_socket = listen_socket[i];
       }
 
       if (listen_socket[i] > max_socket) max_socket = listen_socket[i];
       }
 

-    lcount = select(max_socket + 1, &select_listen, NULL, NULL, NULL);
-    if (lcount < 0)
+    if ((lcount = select(max_socket + 1, &select_listen, NULL, NULL, NULL)) < 0)

       {
       printf("Select failed\n");
       fflush(stdout);
       {
       printf("Select failed\n");
       fflush(stdout);


@@ -441,7 +563,6 @@ for (count = 0; count < connection_count; count++)
 
     accept_socket = -1;
     for (i = 0; i < skn; i++)
 
     accept_socket = -1;
     for (i = 0; i < skn; i++)

-      {

       if (listen_socket[i] > 0 && FD_ISSET(listen_socket[i], &select_listen))
         {
         accept_socket = accept(listen_socket[i],
       if (listen_socket[i] > 0 && FD_ISSET(listen_socket[i], &select_listen))
         {
         accept_socket = accept(listen_socket[i],


@@ -449,7 +570,6 @@ for (count = 0; count < connection_count; count++)
         FD_CLR(listen_socket[i], &select_listen);
         break;
         }
         FD_CLR(listen_socket[i], &select_listen);
         break;
         }

-      }

     }
   alarm(0);
 
     }
   alarm(0);
 


@@ -464,7 +584,7 @@ for (count = 0; count < connection_count; count++)
   dup_accept_socket = dup(accept_socket);
 
   if (port > 0)
   dup_accept_socket = dup(accept_socket);
 
   if (port > 0)

-    printf("\nConnection request from [%s]\n", host_ntoa(&accepted, buffer));
+    printf("\nConnection request from [%s]\n", host_ntoa(&accepted, CS buffer));

   else
     {
     printf("\nConnection request\n");
   else
     {
     printf("\nConnection request\n");


@@ -482,6 +602,7 @@ for (count = 0; count < connection_count; count++)
               cr.pid, cr.uid, cr.gid);
     --------------*****************/
     }
               cr.pid, cr.uid, cr.gid);
     --------------*****************/
     }

+  fflush(stdout);

 
   if (dup_accept_socket < 0)
     {
 
   if (dup_accept_socket < 0)
     {


@@ -500,7 +621,7 @@ for (count = 0; count < connection_count; count++)
   doesn't work for other tests (e.g. ident tests) so we have explicit '<' and
   '>' flags for input and output as well as the defaults. */
 
   doesn't work for other tests (e.g. ident tests) so we have explicit '<' and
   '>' flags for input and output as well as the defaults. */
 

-  for (; s != NULL; s = s->next)
+  for (; s; s = s->next)

     {
     char *ss = s->line;
 
     {
     char *ss = s->line;
 


@@ -512,7 +633,8 @@ for (count = 0; count < connection_count; count++)
     if (ss[0] == '>')
       {
       char *end = "\r\n";
     if (ss[0] == '>')
       {
       char *end = "\r\n";

-      printf("%s\n", ss++);
+      unsigned len = s->len;
+      printit(ss++, len--);

 
       if (strncmp(ss, "*eof", 4) == 0)
         {
 
       if (strncmp(ss, "*eof", 4) == 0)
         {


@@ -521,13 +643,14 @@ for (count = 0; count < connection_count; count++)
         }
 
       if (*ss == '>')
         }
 
       if (*ss == '>')

-        { end = ""; ss++; }
+        { end = ""; ss++; len--; }

       else if (strncmp(ss, "CR>", 3) == 0)
       else if (strncmp(ss, "CR>", 3) == 0)

-        { end = "\r"; ss += 3; }
+        { end = "\r"; ss += 3; len -= 3; }

       else if (strncmp(ss, "LF>", 3) == 0)
       else if (strncmp(ss, "LF>", 3) == 0)

-        { end = "\n"; ss += 3; }
+        { end = "\n"; ss += 3; len -= 3; }

 
 

-      fprintf(out, "%s%s", ss, end);
+      fwrite(ss, 1, len, out);
+      if (*end) fprintf(out, end);

       }
 
     else if (isdigit((unsigned char)ss[0]))
       }
 
     else if (isdigit((unsigned char)ss[0]))


@@ -547,52 +670,138 @@ for (count = 0; count < connection_count; count++)
       sleep(sleepfor);
       }
 
       sleep(sleepfor);
       }
 

+    /* If the script line starts with "*data " we expect a numeric argument,
+    and we expect to read (and discard) that many data bytes from the input. */
+
+    else if (strncmp(ss, "*data ", 6) == 0)
+      {
+      int dlen = atoi(ss+6);
+      int n;
+
+      alarm(timeout);
+
+      if (!linebuf)
+       while (dlen > 0)
+         {
+         n = dlen < sizeof(buffer) ? dlen : sizeof(buffer);
+         if ((n = read(dup_accept_socket, CS buffer, n)) == 0)
+           {
+           printf("Unexpected EOF read from client\n");
+           s = s->next;
+           goto END_OFF;
+           }
+         dlen -= n;
+         }
+      else
+       while (dlen-- > 0)
+         if (fgetc(in) == EOF)
+           {
+           printf("Unexpected EOF read from client\n");
+           s = s->next;
+           goto END_OFF;
+           }
+      }
+

     /* Otherwise the script line is the start of an input line we are expecting
     from the client, or "*eof" indicating we expect the client to close the
     connection. Read command line or data lines; the latter are indicated
     by the expected line being just ".". If the line starts with '<', that
     doesn't form part of the expected input. (This allows for incoming data
     /* Otherwise the script line is the start of an input line we are expecting
     from the client, or "*eof" indicating we expect the client to close the
     connection. Read command line or data lines; the latter are indicated
     by the expected line being just ".". If the line starts with '<', that
     doesn't form part of the expected input. (This allows for incoming data

-    starting with a digit.) */
+    starting with a digit.) If the line starts with '<<' we operate in
+    unbuffered rather than line mode and assume that a single read gets the
+    entire message. */

 
     else
       {
       int offset;
       int data = strcmp(ss, ".") == 0;
 
 
     else
       {
       int offset;
       int data = strcmp(ss, ".") == 0;
 

-      if (ss[0] == '<')
+      if (ss[0] != '<')
+       offset = 0;
+      else

         {
         buffer[0] = '<';
         {
         buffer[0] = '<';

-        offset = 1;
+       if (ss[1] != '<')
+         offset = 1;
+       else
+         {
+         buffer[1] = '<';
+         offset = 2;
+         }

         }
         }

-      else offset = 0;

 
       fflush(out);
 
 
       fflush(out);
 

-      for (;;)
-        {
-        int n;
-        alarm(timeout);
-        if (fgets(buffer+offset, sizeof(buffer)-offset, in) == NULL)
-          {
-          printf("%sxpected EOF read from client\n",
-            (strncmp(ss, "*eof", 4) == 0)? "E" : "Une");
-          s = s->next;
-          goto END_OFF;
-          }
-        alarm(0);
-        n = (int)strlen(buffer);
-        while (n > 0 && isspace(buffer[n-1])) n--;
-        buffer[n] = 0;
-        printf("%s\n", buffer);
-        if (!data || strcmp(buffer, ".") == 0) break;
-        }
-
-      if (strncmp(ss, buffer, (int)strlen(ss)) != 0)
-        {
-        printf("Comparison failed - bailing out\n");
-        printf("Expected: %s\n", ss);
-        break;
-        }
+      if (!linebuf)
+       {
+       int n;
+       char c;
+
+       alarm(timeout);
+       n = read(dup_accept_socket, CS buffer+offset, s->len - offset);
+       if (content_length.in_use) content_length.left -= n;
+       if (n == 0)
+         {
+         printf("%sxpected EOF read from client\n",
+           (strncmp(ss, "*eof", 4) == 0)? "E" : "Une");
+         s = s->next;
+         goto END_OFF;
+         }
+       if (offset != 2)
+         while (read(dup_accept_socket, &c, 1) == 1 && c != '\n') ;
+       alarm(0);
+       n += offset;
+
+       printit(CS buffer, n);
+
+       if (data) do
+         {
+         n = (read(dup_accept_socket, &c, 1) == 1 && c == '.');
+         if (content_length.in_use) content_length.left--;
+         while (c != '\n' && read(dup_accept_socket, &c, 1) == 1)
+            if (content_length.in_use) content_length.left--;
+         } while (!n);
+       else if (memcmp(ss, buffer, n) != 0)
+         {
+         printf("Comparison failed - bailing out\nExpected: ");
+         printit(ss, n);
+         break;
+         }
+       }
+      else
+       {
+       for (;;)
+         {
+         int n;
+         alarm(timeout);
+         if (fgets(CS buffer+offset, sizeof(buffer)-offset, in) == NULL)
+           {
+           printf("%sxpected EOF read from client\n",
+             (strncmp(ss, "*eof", 4) == 0)? "E" : "Une");
+           s = s->next;
+           goto END_OFF;
+           }
+         alarm(0);
+         n = strlen(CS buffer);
+         if (content_length.in_use) content_length.left -= (n - offset);
+         while (n > 0 && isspace(buffer[n-1])) n--;
+         buffer[n] = 0;
+         printf("%s\n", buffer);
+         if (!data || strcmp(CS buffer, ".") == 0) break;
+         }
+
+       if (strncmp(ss, CS buffer, (int)strlen(ss)) != 0)
+         {
+         printf("Comparison failed - bailing out\n");
+         printf("Expected: %s\n", ss);
+         break;
+         }
+       }
+
+       if (sscanf(CCS buffer, "<Content-length: %d", &content_length.left))
+                 content_length.in_use = TRUE;
+       if (content_length.in_use && content_length.left <= 0)
+         shutdown(dup_accept_socket, SHUT_RD);

       }
     }
 
       }
     }
 


@@ -603,7 +812,7 @@ for (count = 0; count < connection_count; count++)
 
 if (s == NULL) printf("End of script\n");
 
 
 if (s == NULL) printf("End of script\n");
 

-if (sockname != NULL) unlink(sockname);
+if (sockname) unlink(sockname);

 exit(0);
 }
 
 exit(0);
 }