X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/tripe/blobdiff_plain/2d752320d61b46a65ebb9fa754033f250f097cd3..452bf3f6897b8c6a22b51e1ef228da39136d51a7:/client.c

diff --git a/client.c b/client.c
index 7edc790b..4aece8d1 100644
--- a/client.c
+++ b/client.c
@@ -79,6 +79,7 @@ static const char *logname = 0;
 static FILE *logfp = 0;
 static unsigned f = 0;
 static int fd;
+static const char *bgtag = 0;
 
 #define f_bogus 1u
 #define f_spawn 2u
@@ -109,6 +110,21 @@ static void writelog(const char *cat, const char *msg)
   fprintf(logfp, "%s %s: %s\n", buf, cat, msg);
 }
 
+static void checkbg(char **p)
+{
+  char *q = str_getword(p);
+  if (!q)
+    die(EXIT_FAILURE, "missing background tag");
+  if (!bgtag || strcmp(bgtag, q) != 0)
+    die(EXIT_FAILURE, "unexpected background tag `%s'", q);
+}
+
+static void checkfg(void)
+{
+  if (bgtag)
+    die(EXIT_FAILURE, "unexpected foreground response");
+}
+
 static void cline(char *p, size_t len, void *b)
 {
   char *q;
@@ -141,13 +157,29 @@ static void cline(char *p, size_t len, void *b)
       writelog("error", d.buf);
       dstr_destroy(&d);
     }
-  } else if (strcmp(q, "FAIL") == 0)
+  } else if (strcmp(q, "FAIL") == 0) {
+    checkfg();
     die(EXIT_FAILURE, "%s", p);
-  else if (strcmp(q, "INFO") == 0)
+  } else if (strcmp(q, "INFO") == 0) {
+    checkfg();
     puts(p);
-  else if (strcmp(q, "OK") == 0)
+  } else if (strcmp(q, "OK") == 0) {
+    checkfg();
+    exit(0);
+  } else if (strcmp(q, "BGDETACH") == 0) {
+    if (bgtag)
+      die(EXIT_FAILURE, "repeat detach");
+    bgtag = xstrdup(p);
+  } else if (strcmp(q, "BGOK") == 0) {
+    checkbg(&p);
     exit(0);
-  else
+  } else if (strcmp(q, "BGINFO") == 0) {
+    checkbg(&p);
+    puts(p);
+  } else if (strcmp(q, "BGFAIL") == 0) {
+    checkbg(&p);
+    die(EXIT_FAILURE, "%s", p);
+  } else
     die(EXIT_FAILURE, "unexpected output `%s %s'", q, p); 
 }
 
@@ -169,7 +201,48 @@ static void uline(char *p, size_t len, void *b)
     f |= f_uclose;
   } else {
     p[len] = '\n';
-    write(fd, p, len + 1);
+    errno = EIO;
+    if (write(fd, p, len + 1) != len + 1)
+      moan("write failed: %s", strerror(errno));
+  }
+}
+
+static void setup(const char *cmd)
+{
+  dstr d = DSTR_INIT;
+  char ch;
+  char *p, *q;
+  int n;
+
+  dstr_puts(&d, cmd);
+  dstr_putc(&d, '\n');
+  errno = EIO; /* Relax: be vague */
+  if (write(fd, d.buf, d.len) != d.len) {
+    die(EXIT_FAILURE, "error sending setup command `%s': %s",
+	cmd, strerror(errno));
+  }
+  dstr_reset(&d);
+  for (;;) {
+    n = read(fd, &ch, 1);
+    if (!n)
+      die(EXIT_FAILURE, "unexpected EOF during setup");
+    if (n < 0) {
+      die(EXIT_FAILURE, "error receiving reply to `%s': %s",
+	  cmd, strerror(errno));
+    }
+    if (d.len < 256)
+      dstr_putc(&d, ch);
+    if (ch == '\n') {
+      p = d.buf;
+      q = str_getword(&p);
+      if (!q)
+	;
+      else if (strcmp(q, "OK") == 0)
+	return;
+      else if (strcmp(q, "FAIL") == 0)
+	die(EXIT_FAILURE, "setup command `%s' failed: %s", cmd, p);
+      dstr_reset(&d);
+    }
   }
 }
 
@@ -245,7 +318,7 @@ Options in full:\n\
 \n\
 -D, --daemon		Become a background task after connecting.\n\
 -d, --directory=DIR	Select current directory [default " CONFIGDIR "].\n\
--a, --admin-socket=FILE	Select socket to connect to
+-a, --admin-socket=FILE	Select socket to connect to\n\
                           [default " SOCKETDIR "/tripesock].\n\
 -P, --pidfile=FILE	Write process-id to FILE.\n\
 \n\
@@ -440,9 +513,12 @@ int main(int argc, char *argv[])
     fprintf(pidfp, "%li\n", (long)getpid());
     fclose(pidfp);
   }
+  signal(SIGPIPE, SIG_IGN);
 
   /* --- If we're meant to be interactive, do that --- */
 
+  if (optind == argc)
+    setup("WATCH -A+tw");
   if (!(f & f_noinput) && optind == argc) {
     sel_state sel;
     selbuf bu, bs;
@@ -460,14 +536,16 @@ int main(int argc, char *argv[])
 
   if (optind < argc) {
     dstr d = DSTR_INIT;
+    setup((f & f_warn) ? "WATCH -A+w" : "WATCH -A");
     dstr_puts(&d, argv[optind++]);
     while (optind < argc) {
       dstr_putc(&d, ' ');
       dstr_puts(&d, argv[optind++]);
     }
     dstr_putc(&d, '\n');
-    write(fd, d.buf, d.len);
-    shutdown(fd, 1);
+    errno = EIO;
+    if (write(fd, d.buf, d.len) != d.len || shutdown(fd, 1))
+      die(EXIT_FAILURE, "write failed: %s", strerror(errno));
     dstr_destroy(&d);
     f |= f_command;
   }