New component flag: nullinput

* NEWS: Update.
* doc/pies.texi: Document nullinput flag.
* src/pies.c (str_to_cf): New flag: nullinput
* src/pies.h (CF_NULLINPUT): New flag.
* src/progman.c (prog_start): If CF_NULLINPUT flag is set,
redirect /dev/null to the stdin

3 files changed, 14 insertions, 0 deletions

diff --git a/src/pies.c b/src/pies.c
index e1a7356..b92b7a3 100644
--- a/src/pies.c
+++ b/src/pies.c
@@ -904,6 +904,7 @@ str_to_cf (const char *string, int *flags)
     { "sockenv", CF_SOCKENV },
     { "resolve", CF_RESOLVE },
     { "siggroup", CF_SIGGROUP },
+    { "nullinput", CF_NULLINPUT },
     { NULL }
   };
 
diff --git a/src/pies.h b/src/pies.h
index 73f6d18..b627b47 100644
--- a/src/pies.h
+++ b/src/pies.h
@@ -202,6 +202,8 @@ enum pies_comp_mode
 #define CF_RESOLVE     0x080 /* Resolve IP addresses */
 #define CF_SIGGROUP    0x100 /* Send signals to the process group */
 
+#define CF_NULLINPUT   0x200 /* Provide null input stream */
+
 #define ISCF_TCPMUX(f) ((f) & (CF_TCPMUX | CF_TCPMUXPLUS))
 
 struct component
diff --git a/src/progman.c b/src/progman.c
index e666535..1455f67 100644
--- a/src/progman.c
+++ b/src/progman.c
@@ -1207,6 +1207,17 @@ prog_start (struct prog *prog)
             }
           else
             {
+              if (prog->v.p.comp->flags & CF_NULLINPUT)
+                {
+                  close(0);
+                  if (open("/dev/null", O_RDONLY) != 0)
+                    {
+                      logmsg (LOG_CRIT, "can't open /dev/null: %s",
+                              strerror(errno));
+                      _exit(127);
+                    }
+                }
+
               if (redir[RETR_OUT] == -1)
                 {
                   close (1);