From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 14 Jul 2006 22:42:01 +0000 (+0000)
Subject: try to use send(,,MSG_NOSIGNAL) instead of write() wherever possible (which
X-Git-Tag: submit/2.0-panda/20130828.192557~3515
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=860be2e70b33ff5eeb9130f80c4b1c096a2a8f27;p=profile%2Fivi%2Fpulseaudio-panda.git

try to use send(,,MSG_NOSIGNAL) instead of write() wherever possible (which
will allow us to drop the SIGPIPE check). Cache the results of the last
write()/send() to make sure that we do not issue more than necessary system
calls.



git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@1083 fefdeb5f-60dc-0310-8127-8f9354f1896f
---

diff --git a/src/daemon/cpulimit.c b/src/daemon/cpulimit.c
index a8c9d3f..b8740ea 100644
--- a/src/daemon/cpulimit.c
+++ b/src/daemon/cpulimit.c
@@ -111,7 +111,7 @@ static void reset_cpu_time(int t) {
 
 /* A simple, thread-safe puts() work-alike */
 static void write_err(const char *p) {
-    pa_loop_write(2, p, strlen(p));
+    pa_loop_write(2, p, strlen(p), NULL);
 }
 
 /* The signal handler, called on every SIGXCPU */
@@ -159,7 +159,7 @@ static void signal_handler(int sig) {
 static void callback(pa_mainloop_api*m, pa_io_event*e, int fd, pa_io_event_flags_t f, void *userdata) {
     char c;
     assert(m && e && f == PA_IO_EVENT_INPUT && e == io_event && fd == the_pipe[0]);
-    read(the_pipe[0], &c, sizeof(c));
+    pa_read(the_pipe[0], &c, sizeof(c), NULL);
     m->quit(m, 1); /* Quit the main loop */
 }
 
diff --git a/src/daemon/main.c b/src/daemon/main.c
index 5e7330a..c41c69d 100644
--- a/src/daemon/main.c
+++ b/src/daemon/main.c
@@ -304,7 +304,7 @@ int main(int argc, char *argv[]) {
             close(daemon_pipe[1]);
             daemon_pipe[1] = -1;
 
-            if (pa_loop_read(daemon_pipe[0], &retval, sizeof(retval)) != sizeof(retval)) {
+            if (pa_loop_read(daemon_pipe[0], &retval, sizeof(retval), NULL) != sizeof(retval)) {
                 pa_log(__FILE__": read() failed: %s", pa_cstrerror(errno));
                 retval = 1;
             }
@@ -368,7 +368,7 @@ int main(int argc, char *argv[]) {
             pa_log(__FILE__": pa_pid_file_create() failed.");
 #ifdef HAVE_FORK
             if (conf->daemonize)
-                pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
+                pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
 #endif
             goto finish;
         }
@@ -428,20 +428,20 @@ int main(int argc, char *argv[]) {
         pa_log(__FILE__": failed to initialize daemon.");
 #ifdef HAVE_FORK
         if (conf->daemonize)
-            pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
+            pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
 #endif
     } else if (!c->modules || pa_idxset_size(c->modules) == 0) {
         pa_log(__FILE__": daemon startup without any loaded modules, refusing to work.");
 #ifdef HAVE_FORK
         if (conf->daemonize)
-            pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
+            pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
 #endif
     } else {
 
         retval = 0;
 #ifdef HAVE_FORK
         if (conf->daemonize)
-            pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
+            pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
 #endif
 
         c->disallow_module_loading = conf->disallow_module_loading;
diff --git a/src/modules/module-esound-compat-spawnfd.c b/src/modules/module-esound-compat-spawnfd.c
index c4bc342..54e090e 100644
--- a/src/modules/module-esound-compat-spawnfd.c
+++ b/src/modules/module-esound-compat-spawnfd.c
@@ -59,7 +59,7 @@ int pa__init(pa_core *c, pa_module*m) {
         goto finish;
     }
 
-    if (pa_loop_write(fd, &x, sizeof(x)) != sizeof(x))
+    if (pa_loop_write(fd, &x, sizeof(x), NULL) != sizeof(x))
         pa_log(__FILE__": WARNING: write(%u, 1, 1) failed: %s", fd, pa_cstrerror(errno));
 
     close(fd);
diff --git a/src/modules/module-jack-sink.c b/src/modules/module-jack-sink.c
index 74f25d5..d761c1f 100644
--- a/src/modules/module-jack-sink.c
+++ b/src/modules/module-jack-sink.c
@@ -80,6 +80,7 @@ struct userdata {
     jack_nframes_t frames_requested;
     int quit_requested;
 
+    int pipe_fd_type;
     int pipe_fds[2];
     pa_io_event *io_event;
 
@@ -120,7 +121,7 @@ static void io_event_cb(pa_mainloop_api *m, pa_io_event *e, int fd, pa_io_event_
     assert(u);
     assert(u->pipe_fds[0] == fd);
 
-    read(fd, &x, 1);
+    pa_read(fd, &x, 1, &u->pipe_fd_type);
     
     if (u->quit_requested) {
         stop_sink(u);
@@ -165,7 +166,7 @@ static void request_render(struct userdata *u) {
     assert(u);
 
     assert(u->pipe_fds[1] >= 0);
-    write(u->pipe_fds[1], &c, 1);
+    pa_write(u->pipe_fds[1], &c, 1, &u->pipe_fd_type);
 }
 
 static void jack_shutdown(void *arg) {
@@ -268,6 +269,7 @@ int pa__init(pa_core *c, pa_module*m) {
     u->core = c;
     u->module = m;
     u->pipe_fds[0] = u->pipe_fds[1] = -1;
+    u->pipe_fd_type = 0;
 
     pthread_mutex_init(&u->mutex, NULL);
     pthread_cond_init(&u->cond, NULL);
diff --git a/src/modules/module-jack-source.c b/src/modules/module-jack-source.c
index 9c7f449..649a8f9 100644
--- a/src/modules/module-jack-source.c
+++ b/src/modules/module-jack-source.c
@@ -81,6 +81,7 @@ struct userdata {
     int quit_requested;
 
     int pipe_fds[2];
+    int pipe_fd_type;
     pa_io_event *io_event;
 
     jack_nframes_t frames_in_buffer;
@@ -119,7 +120,7 @@ static void io_event_cb(pa_mainloop_api *m, pa_io_event *e, int fd, pa_io_event_
     assert(u);
     assert(u->pipe_fds[0] == fd);
 
-    read(fd, &x, 1);
+    pa_read(fd, &x, 1, &u->pipe_fd_type);
     
     if (u->quit_requested) {
         stop_source(u);
@@ -166,7 +167,7 @@ static void request_post(struct userdata *u) {
     assert(u);
 
     assert(u->pipe_fds[1] >= 0);
-    write(u->pipe_fds[1], &c, 1);
+    pa_write(u->pipe_fds[1], &c, 1, &u->pipe_fd_type);
 }
 
 static void jack_shutdown(void *arg) {
@@ -266,6 +267,7 @@ int pa__init(pa_core *c, pa_module*m) {
     u->core = c;
     u->module = m;
     u->pipe_fds[0] = u->pipe_fds[1] = -1;
+    u->pipe_fd_type = 0;
 
     pthread_mutex_init(&u->mutex, NULL);
     pthread_cond_init(&u->cond, NULL);
diff --git a/src/modules/module-mmkbd-evdev.c b/src/modules/module-mmkbd-evdev.c
index ddbf16d2..c3d0739 100644
--- a/src/modules/module-mmkbd-evdev.c
+++ b/src/modules/module-mmkbd-evdev.c
@@ -70,7 +70,7 @@ static const char* const valid_modargs[] = {
 };
 
 struct userdata {
-    int fd;
+    int fd, fd_type;
     pa_io_event *io;
     char *sink_name;
     pa_module *module;
@@ -89,7 +89,7 @@ static void io_callback(pa_mainloop_api *io, PA_GCC_UNUSED pa_io_event *e, PA_GC
     if (events & PA_IO_EVENT_INPUT) {
         struct input_event ev;
 
-        if (pa_loop_read(u->fd, &ev, sizeof(ev)) <= 0) {
+        if (pa_loop_read(u->fd, &ev, sizeof(ev), &u->fd_type) <= 0) {
             pa_log(__FILE__": failed to read from event device: %s", pa_cstrerror(errno));
             goto fail;
         }
@@ -182,6 +182,7 @@ int pa__init(pa_core *c, pa_module*m) {
     u->io = NULL;
     u->sink_name = pa_xstrdup(pa_modargs_get_value(ma, "sink", NULL));
     u->fd = -1;
+    u->fd_type = 0;
 
     if ((u->fd = open(pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), O_RDONLY)) < 0) {
         pa_log(__FILE__": failed to open evdev device: %s", pa_cstrerror(errno));
diff --git a/src/modules/module-oss.c b/src/modules/module-oss.c
index 5a80661..a3ea2c1 100644
--- a/src/modules/module-oss.c
+++ b/src/modules/module-oss.c
@@ -467,7 +467,7 @@ int pa__init(pa_core *c, pa_module*m) {
      */
     if (u->source) {
         char *buf = pa_xnew(char, u->sample_size);
-        read(u->fd, buf, u->sample_size);
+        pa_read(u->fd, buf, u->sample_size, NULL);
         pa_xfree(buf);
     }
 
diff --git a/src/pulse/mainloop-signal.c b/src/pulse/mainloop-signal.c
index c3cf362..11a27cd 100644
--- a/src/pulse/mainloop-signal.c
+++ b/src/pulse/mainloop-signal.c
@@ -67,7 +67,7 @@ static void signal_handler(int sig) {
 #ifndef HAVE_SIGACTION
     signal(sig, signal_handler);
 #endif
-    pa_write(signal_pipe[1], &sig, sizeof(sig));
+    pa_write(signal_pipe[1], &sig, sizeof(sig), NULL);
 }
 
 static void dispatch(pa_mainloop_api*a, int sig) {
@@ -86,7 +86,7 @@ static void callback(pa_mainloop_api*a, pa_io_event*e, int fd, pa_io_event_flags
     int sig;
     assert(a && e && f == PA_IO_EVENT_INPUT && e == io_event && fd == signal_pipe[0]);
 
-    if ((r = pa_read(signal_pipe[0], &sig, sizeof(sig))) < 0) {
+    if ((r = pa_read(signal_pipe[0], &sig, sizeof(sig), NULL)) < 0) {
         if (errno == EAGAIN)
             return;
 
diff --git a/src/pulse/mainloop.c b/src/pulse/mainloop.c
index 32f1a84..dfbc337 100644
--- a/src/pulse/mainloop.c
+++ b/src/pulse/mainloop.c
@@ -100,6 +100,7 @@ struct pa_mainloop {
     int deferred_pending;
 
     int wakeup_pipe[2];
+    int wakeup_pipe_type;
 
     enum {
         STATE_PASSIVE,
@@ -337,6 +338,7 @@ pa_mainloop *pa_mainloop_new(void) {
 
     m = pa_xmalloc(sizeof(pa_mainloop));
 
+    m->wakeup_pipe_type = 0;
     if (pipe(m->wakeup_pipe) < 0) {
         pa_log_error(__FILE__": ERROR: cannot create wakeup pipe");
         pa_xfree(m);
@@ -625,7 +627,7 @@ void pa_mainloop_wakeup(pa_mainloop *m) {
     assert(m);
 
     if (m->wakeup_pipe[1] >= 0)
-        pa_write(m->wakeup_pipe[1], &c, sizeof(c));
+        pa_write(m->wakeup_pipe[1], &c, sizeof(c), &m->wakeup_pipe_type);
 }
 
 static void clear_wakeup(pa_mainloop *m) {
@@ -636,7 +638,7 @@ static void clear_wakeup(pa_mainloop *m) {
     if (m->wakeup_pipe[0] < 0)
         return;
 
-    while (pa_read(m->wakeup_pipe[0], &c, sizeof(c)) == sizeof(c));
+    while (pa_read(m->wakeup_pipe[0], &c, sizeof(c), &m->wakeup_pipe_type) == sizeof(c));
 }
 
 int pa_mainloop_prepare(pa_mainloop *m, int timeout) {
diff --git a/src/pulse/xmalloc.c b/src/pulse/xmalloc.c
index 46871ae..3675516 100644
--- a/src/pulse/xmalloc.c
+++ b/src/pulse/xmalloc.c
@@ -49,7 +49,7 @@ static void oom(void) PA_GCC_NORETURN;
  * exits */
 static void oom(void) {
     static const char e[] = "Not enough memory\n";
-    pa_loop_write(STDERR_FILENO, e, sizeof(e)-1);
+    pa_loop_write(STDERR_FILENO, e, sizeof(e)-1, NULL);
 #ifdef SIGQUIT
     raise(SIGQUIT);
 #endif
diff --git a/src/pulsecore/authkey.c b/src/pulsecore/authkey.c
index 064209d..a5df3ed 100644
--- a/src/pulsecore/authkey.c
+++ b/src/pulsecore/authkey.c
@@ -53,7 +53,7 @@ static int generate(int fd, void *ret_data, size_t length) {
     lseek(fd, 0, SEEK_SET);
     ftruncate(fd, 0);
 
-    if ((r = pa_loop_write(fd, ret_data, length)) < 0 || (size_t) r != length) {
+    if ((r = pa_loop_write(fd, ret_data, length, NULL)) < 0 || (size_t) r != length) {
         pa_log(__FILE__": failed to write cookie file: %s", pa_cstrerror(errno));
         return -1;
     }
@@ -84,7 +84,7 @@ static int load(const char *fn, void *data, size_t length) {
 
     unlock = pa_lock_fd(fd, 1) >= 0;
 
-    if ((r = pa_loop_read(fd, data, length)) < 0) {
+    if ((r = pa_loop_read(fd, data, length, NULL)) < 0) {
         pa_log(__FILE__": failed to read cookie file '%s': %s", fn, pa_cstrerror(errno));
         goto finish;
     }
@@ -188,7 +188,7 @@ int pa_authkey_save(const char *fn, const void *data, size_t length) {
 
     unlock = pa_lock_fd(fd, 1) >= 0;
 
-    if ((r = pa_loop_write(fd, data, length)) < 0 || (size_t) r != length) {
+    if ((r = pa_loop_write(fd, data, length, NULL)) < 0 || (size_t) r != length) {
         pa_log(__FILE__": failed to read cookie file '%s': %s", fn, pa_cstrerror(errno));
         goto finish;
     }
diff --git a/src/pulsecore/core-util.c b/src/pulsecore/core-util.c
index 9d694da..16c3631 100644
--- a/src/pulsecore/core-util.c
+++ b/src/pulsecore/core-util.c
@@ -201,57 +201,81 @@ finish:
     return ret;
 }
 
-/** Platform independent read function. Necessary since not all systems
- * treat all file descriptors equal. */
-ssize_t pa_read(int fd, void *buf, size_t count) {
-    ssize_t r;
+/** Platform independent read function. Necessary since not all
+ * systems treat all file descriptors equal. If type is
+ * non-NULL it is used to cache the type of the fd. This is
+ * useful for making sure that only a single syscall is executed per
+ * function call. The variable pointed to should be initialized to 0
+ * by the caller. */
+ssize_t pa_read(int fd, void *buf, size_t count, int *type) {
 
 #ifdef OS_IS_WIN32
-    r = recv(fd, buf, count, 0);
-    if (r < 0) {
+
+    if (!type || *type == 0) {
+        ssize_t r;
+        
+        if ((r = recv(fd, buf, count, 0)) >= 0)
+            return r;
+
         if (WSAGetLastError() != WSAENOTSOCK) {
             errno = WSAGetLastError();
             return r;
         }
+
+        if (type)
+            *type = 1;
     }
 
-    if (r < 0)
 #endif
-        r = read(fd, buf, count);
-
-    return r;
+    
+    return read(fd, buf, count);
 }
 
 /** Similar to pa_read(), but handles writes */
-ssize_t pa_write(int fd, const void *buf, size_t count) {
-    ssize_t r;
+ssize_t pa_write(int fd, const void *buf, size_t count, int *type) {
+
+    if (!type || *type == 0) {
+        ssize_t r;
 
+        if ((r = send(fd, buf, count, MSG_NOSIGNAL)) >= 0)
+            return r;
+    
 #ifdef OS_IS_WIN32
-    r = send(fd, buf, count, 0);
-    if (r < 0) {
         if (WSAGetLastError() != WSAENOTSOCK) {
             errno = WSAGetLastError();
             return r;
         }
-    }
-
-    if (r < 0)
+#else
+        if (errno != ENOTSOCK)
+            return r;
 #endif
-        r = write(fd, buf, count);
 
-    return r;
+        if (type)
+            *type = 1;
+    }
+
+    return write(fd, buf, count);
 }
 
 /** Calls read() in a loop. Makes sure that as much as 'size' bytes,
  * unless EOF is reached or an error occured */
-ssize_t pa_loop_read(int fd, void*data, size_t size) {
+ssize_t pa_loop_read(int fd, void*data, size_t size, int *type) {
     ssize_t ret = 0;
-    assert(fd >= 0 && data && size);
+    int _type;
+    
+    assert(fd >= 0);
+    assert(data);
+    assert(size);
+
+    if (!type) {
+        _type = 0;
+        type = &_type;
+    }
 
     while (size > 0) {
         ssize_t r;
 
-        if ((r = pa_read(fd, data, size)) < 0)
+        if ((r = pa_read(fd, data, size, type)) < 0)
             return r;
 
         if (r == 0)
@@ -266,14 +290,23 @@ ssize_t pa_loop_read(int fd, void*data, size_t size) {
 }
 
 /** Similar to pa_loop_read(), but wraps write() */
-ssize_t pa_loop_write(int fd, const void*data, size_t size) {
+ssize_t pa_loop_write(int fd, const void*data, size_t size, int *type) {
     ssize_t ret = 0;
-    assert(fd >= 0 && data && size);
+    int _type;
+
+    assert(fd >= 0);
+    assert(data);
+    assert(size);
+
+    if (!type) {
+        _type = 0;
+        type = &_type;
+    }
 
     while (size > 0) {
         ssize_t r;
 
-        if ((r = pa_write(fd, data, size)) < 0)
+        if ((r = pa_write(fd, data, size, type)) < 0)
             return r;
 
         if (r == 0)
diff --git a/src/pulsecore/core-util.h b/src/pulsecore/core-util.h
index 0012afc..864a96e 100644
--- a/src/pulsecore/core-util.h
+++ b/src/pulsecore/core-util.h
@@ -36,10 +36,10 @@ void pa_make_nonblock_fd(int fd);
 int pa_make_secure_dir(const char* dir);
 int pa_make_secure_parent_dir(const char *fn);
 
-ssize_t pa_read(int fd, void *buf, size_t count);
-ssize_t pa_write(int fd, const void *buf, size_t count);
-ssize_t pa_loop_read(int fd, void*data, size_t size);
-ssize_t pa_loop_write(int fd, const void*data, size_t size);
+ssize_t pa_read(int fd, void *buf, size_t count, int *type);
+ssize_t pa_write(int fd, const void *buf, size_t count, int *type);
+ssize_t pa_loop_read(int fd, void*data, size_t size, int *type);
+ssize_t pa_loop_write(int fd, const void*data, size_t size, int *type);
 
 void pa_check_signal_is_blocked(int sig);
 
diff --git a/src/pulsecore/iochannel.c b/src/pulsecore/iochannel.c
index 8a19094..842c0e6 100644
--- a/src/pulsecore/iochannel.c
+++ b/src/pulsecore/iochannel.c
@@ -49,6 +49,7 @@
 
 struct pa_iochannel {
     int ifd, ofd;
+    int ifd_type, ofd_type;
     pa_mainloop_api* mainloop;
 
     pa_iochannel_cb_t callback;
@@ -127,6 +128,7 @@ pa_iochannel* pa_iochannel_new(pa_mainloop_api*m, int ifd, int ofd) {
     io = pa_xnew(pa_iochannel, 1);
     io->ifd = ifd;
     io->ofd = ofd;
+    io->ifd_type = io->ofd_type = 0;
     io->mainloop = m;
 
     io->userdata = NULL;
@@ -204,7 +206,7 @@ ssize_t pa_iochannel_write(pa_iochannel*io, const void*data, size_t l) {
     assert(l);
     assert(io->ofd >= 0);
 
-    r = pa_write(io->ofd, data, l);
+    r = pa_write(io->ofd, data, l, &io->ofd_type);
     if (r >= 0) {
         io->writable = 0;
         enable_mainloop_sources(io);
@@ -220,7 +222,7 @@ ssize_t pa_iochannel_read(pa_iochannel*io, void*data, size_t l) {
     assert(data);
     assert(io->ifd >= 0);
 
-    r = pa_read(io->ifd, data, l);
+    r = pa_read(io->ifd, data, l, &io->ifd_type);
     if (r >= 0) {
         io->readable = 0;
         enable_mainloop_sources(io);
diff --git a/src/pulsecore/pid.c b/src/pulsecore/pid.c
index b897286..0ad76a6 100644
--- a/src/pulsecore/pid.c
+++ b/src/pulsecore/pid.c
@@ -56,7 +56,7 @@ static pid_t read_pid(const char *fn, int fd) {
 
     assert(fn && fd >= 0);
 
-    if ((r = pa_loop_read(fd, t, sizeof(t)-1)) < 0) {
+    if ((r = pa_loop_read(fd, t, sizeof(t)-1, NULL)) < 0) {
         pa_log_warn(__FILE__": WARNING: failed to read PID file '%s': %s",
             fn, pa_cstrerror(errno));
         return (pid_t) -1;
@@ -177,7 +177,7 @@ int pa_pid_file_create(void) {
     snprintf(t, sizeof(t), "%lu\n", (unsigned long) getpid());
     l = strlen(t);
     
-    if (pa_loop_write(fd, t, l) != (ssize_t) l) {
+    if (pa_loop_write(fd, t, l, NULL) != (ssize_t) l) {
         pa_log(__FILE__": failed to write PID file.");
         goto fail;
     }
diff --git a/src/pulsecore/random.c b/src/pulsecore/random.c
index 3d3357a..684ead7 100644
--- a/src/pulsecore/random.c
+++ b/src/pulsecore/random.c
@@ -61,7 +61,7 @@ static int random_proper(void *ret_data, size_t length) {
 
         if ((fd = open(*device, O_RDONLY)) >= 0) {
 
-            if ((r = pa_loop_read(fd, ret_data, length)) < 0 || (size_t) r != length)
+            if ((r = pa_loop_read(fd, ret_data, length, NULL)) < 0 || (size_t) r != length)
                 ret = -1;
 
             close(fd);
diff --git a/src/tests/mcalign-test.c b/src/tests/mcalign-test.c
index ccb0613..7a68e6d 100644
--- a/src/tests/mcalign-test.c
+++ b/src/tests/mcalign-test.c
@@ -82,7 +82,7 @@ int main(PA_GCC_UNUSED int argc, PA_GCC_UNUSED char *argv[]) {
             if (pa_mcalign_pop(a, &t) < 0)
                 break;
 
-            pa_loop_write(STDOUT_FILENO, (uint8_t*) t.memblock->data + t.index, t.length);
+            pa_loop_write(STDOUT_FILENO, (uint8_t*) t.memblock->data + t.index, t.length, NULL);
             fprintf(stderr, "Wrote %lu bytes.\n", (unsigned long) t.length);
 
             pa_memblock_unref(t.memblock);