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path: root/source3/passdb/pdb_smbpasswd.c
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Diffstat (limited to 'source3/passdb/pdb_smbpasswd.c')
-rw-r--r--source3/passdb/pdb_smbpasswd.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/source3/passdb/pdb_smbpasswd.c b/source3/passdb/pdb_smbpasswd.c
index c3f190ff30..d4652ca044 100644
--- a/source3/passdb/pdb_smbpasswd.c
+++ b/source3/passdb/pdb_smbpasswd.c
@@ -64,6 +64,52 @@ struct smbpasswd_privates
enum pwf_access_type { PWF_READ, PWF_UPDATE, PWF_CREATE };
+static SIG_ATOMIC_T gotalarm;
+
+/***************************************************************
+ Signal function to tell us we timed out.
+****************************************************************/
+
+static void gotalarm_sig(void)
+{
+ gotalarm = 1;
+}
+
+/***************************************************************
+ Lock or unlock a fd for a known lock type. Abandon after waitsecs
+ seconds.
+****************************************************************/
+
+static BOOL do_file_lock(int fd, int waitsecs, int type)
+{
+ SMB_STRUCT_FLOCK lock;
+ int ret;
+ void (*oldsig_handler)(int);
+
+ gotalarm = 0;
+ oldsig_handler = CatchSignal(SIGALRM, SIGNAL_CAST gotalarm_sig);
+
+ lock.l_type = type;
+ lock.l_whence = SEEK_SET;
+ lock.l_start = 0;
+ lock.l_len = 1;
+ lock.l_pid = 0;
+
+ alarm(waitsecs);
+ /* Note we must *NOT* use sys_fcntl here ! JRA */
+ ret = fcntl(fd, SMB_F_SETLKW, &lock);
+ alarm(0);
+ CatchSignal(SIGALRM, SIGNAL_CAST oldsig_handler);
+
+ if (gotalarm) {
+ DEBUG(0, ("do_file_lock: failed to %s file.\n",
+ type == F_UNLCK ? "unlock" : "lock"));
+ return False;
+ }
+
+ return (ret == 0);
+}
+
/***************************************************************
Lock an fd. Abandon after waitsecs seconds.
****************************************************************/