commit ecb0d9e54ee87c488923372e5a0ccb7c052fbce1
Author:     Quentin Rameau <[email protected]>
AuthorDate: Mon Jul 24 17:43:35 2017 +0200
Commit:     Laslo Hunhold <[email protected]>
CommitDate: Tue Jul 25 22:42:13 2017 +0200

    Do not remove existing socket file
    
    Check for its presence and bail out if found.
    If the socket file is present, either a server is already bound to it,
    or the last one errored out and we'd want to inspect this.
    Also it could be an unrelated file given by error.

diff --git a/quark.c b/quark.c
index 11db5be..a201f54 100644
--- a/quark.c
+++ b/quark.c
@@ -938,10 +938,8 @@ getusock(char *udsname, uid_t uid, gid_t gid)
        }
        memcpy(addr.sun_path, udsname, udsnamelen + 1);
 
-       unlink(udsname);
-
        if (bind(insock, (const struct sockaddr *)&addr, sizeof(addr)) < 0) {
-               die("%s: bind: %s\n", argv0, strerror(errno));
+               die("%s: bind %s: %s\n", argv0, udsname, strerror(errno));
        }
 
        if (listen(insock, SOMAXCONN) < 0) {
@@ -1017,6 +1015,11 @@ main(int argc, char *argv[])
                usage();
        }
 
+       if (udsname && (!access(udsname, F_OK) || errno != ENOENT)) {
+               die("%s: socket file: %s\n",
+                   argv0, errno ? strerror(errno) : "file exists");
+       }
+
        /* compile and check the supplied vhost regexes */
        if (vhosts) {
                for (i = 0; i < LEN(vhost); i++) {

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