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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
commitb5896ba9f6047e7031e2bdee0622d543e11a6734 (patch)
treefd7b460593a2fee1be579bec5697e6d887ea3421 /src/util/stream_connect.c
parentInitial commit. (diff)
downloadpostfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.tar.xz
postfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.zip
Adding upstream version 3.4.23.upstream/3.4.23upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/util/stream_connect.c')
-rw-r--r--src/util/stream_connect.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/src/util/stream_connect.c b/src/util/stream_connect.c
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+/*++
+/* NAME
+/* stream_connect 3
+/* SUMMARY
+/* connect to stream listener
+/* SYNOPSIS
+/* #include <connect.h>
+/*
+/* int stream_connect(path, block_mode, timeout)
+/* const char *path;
+/* int block_mode;
+/* int timeout;
+/* DESCRIPTION
+/* stream_connect() connects to a stream listener for the specified
+/* pathname, and returns the resulting file descriptor.
+/*
+/* Arguments:
+/* .IP path
+/* Null-terminated string with listener endpoint name.
+/* .IP block_mode
+/* Either NON_BLOCKING for a non-blocking stream, or BLOCKING for
+/* blocking mode. However, a stream connection succeeds or fails
+/* immediately.
+/* .IP timeout
+/* This argument is ignored; it is present for compatibility with
+/* other interfaces. Stream connections succeed or fail immediately.
+/* DIAGNOSTICS
+/* The result is -1 in case the connection could not be made.
+/* Fatal errors: other system call failures.
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+
+#ifdef STREAM_CONNECTIONS
+
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stropts.h>
+
+#endif
+
+/* Utility library. */
+
+#include <msg.h>
+#include <connect.h>
+
+/* stream_connect - connect to stream listener */
+
+int stream_connect(const char *path, int block_mode, int unused_timeout)
+{
+#ifdef STREAM_CONNECTIONS
+ const char *myname = "stream_connect";
+ int pair[2];
+ int fifo;
+
+ /*
+ * The requested file system object must exist, otherwise we can't reach
+ * the server.
+ */
+ if ((fifo = open(path, O_WRONLY | O_NONBLOCK, 0)) < 0)
+ return (-1);
+
+ /*
+ * This is for {unix,inet}_connect() compatibility.
+ */
+ if (block_mode == BLOCKING)
+ non_blocking(fifo, BLOCKING);
+
+ /*
+ * Create a pipe, and send one pipe end to the server.
+ */
+ if (pipe(pair) < 0)
+ msg_fatal("%s: pipe: %m", myname);
+ if (ioctl(fifo, I_SENDFD, pair[1]) < 0)
+ msg_fatal("%s: send file descriptor: %m", myname);
+ close(pair[1]);
+
+ /*
+ * This is for {unix,inet}_connect() compatibility.
+ */
+ if (block_mode == NON_BLOCKING)
+ non_blocking(pair[0], NON_BLOCKING);
+
+ /*
+ * Cleanup.
+ */
+ close(fifo);
+
+ /*
+ * Keep the other end of the pipe.
+ */
+ return (pair[0]);
+#else
+ msg_fatal("stream connections are not implemented");
+#endif
+}