[PATCH vd_agent_linux v3 2/2] Check errors setting standard file descriptors

[Frediano Ziglio <fziglio@xxxxxxxxxx>]

Signed-off-by: Frediano Ziglio <fziglio@xxxxxxxxxx>
---
 src/vdagent/vdagent.c   | 16 ++++++++++++----
 src/vdagentd/vdagentd.c | 16 ++++++++++++----
 2 files changed, 24 insertions(+), 8 deletions(-)

Changes since v2:
- avoid long if chaining.

diff --git a/src/vdagent/vdagent.c b/src/vdagent/vdagent.c
index 9642a30..90247f9 100644
--- a/src/vdagent/vdagent.c
+++ b/src/vdagent/vdagent.c
@@ -280,7 +280,6 @@ static void wait_and_exit(int s)
 
 static int daemonize(void)
 {
-    int x;
     int fd[2];
 
     if (socketpair(PF_LOCAL, SOCK_STREAM, 0, fd)) {
@@ -295,9 +294,18 @@ static int daemonize(void)
         close(STDOUT_FILENO);
         close(STDERR_FILENO);
         setsid();
-        x = open("/dev/null", O_RDWR);
-        x = dup(x);
-        x = dup(x);
+        // coverity[leaked_handle] just opening standard file descriptors
+        if (open("/dev/null", O_RDWR) != STDIN_FILENO) {
+            exit(1);
+        }
+        // coverity[leaked_handle] just opening standard file descriptors
+        if (dup(STDIN_FILENO) != STDOUT_FILENO) {
+            exit(1);
+        }
+        // coverity[leaked_handle] just opening standard file descriptors
+        if (dup(STDOUT_FILENO) != STDERR_FILENO) {
+            exit(1);
+        }
         close(fd[0]);
         return fd[1];
     case -1:
diff --git a/src/vdagentd/vdagentd.c b/src/vdagentd/vdagentd.c
index 5ed29cc..f5ba3c2 100644
--- a/src/vdagentd/vdagentd.c
+++ b/src/vdagentd/vdagentd.c
@@ -941,7 +941,6 @@ static void agent_read_complete(struct udscs_connection **connp,
 
 static void daemonize(void)
 {
-    int x;
     FILE *pidfile;
 
     /* detach from terminal */
@@ -951,9 +950,18 @@ static void daemonize(void)
         close(STDOUT_FILENO);
         close(STDERR_FILENO);
         setsid();
-        x = open("/dev/null", O_RDWR);
-        x = dup(x);
-        x = dup(x);
+        // coverity[leaked_handle] just opening standard file descriptors
+        if (open("/dev/null", O_RDWR) != STDIN_FILENO) {
+            exit(1);
+        }
+        // coverity[leaked_handle] just opening standard file descriptors
+        if (dup(STDIN_FILENO) != STDOUT_FILENO) {
+            exit(1);
+        }
+        // coverity[leaked_handle] just opening standard file descriptors
+        if (dup(STDOUT_FILENO) != STDERR_FILENO) {
+            exit(1);
+        }
         pidfile = fopen(pidfilename, "w");
         if (pidfile) {
             fprintf(pidfile, "%d\n", (int)getpid());
-- 
2.20.1

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