Merge pull request #25483 from poettering/ppoll-usec-eintr

ppoll() + EINTR fixes

src/shared/ask-password-api.c

@@ -235,8 +235,7 @@ int ask_password_plymouth(
                 if (notify < 0)
                         return -errno;
 
-                r = inotify_add_watch(notify, flag_file, IN_ATTRIB); /* for the link count */
-                if (r < 0)
+                if (inotify_add_watch(notify, flag_file, IN_ATTRIB) < 0) /* for the link count */
                         return -errno;
         }
 
@@ -244,8 +243,7 @@ int ask_password_plymouth(
         if (fd < 0)
                 return -errno;
 
-        r = connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un));
-        if (r < 0)
+        if (connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0)
                 return -errno;
 
         if (FLAGS_SET(flags, ASK_PASSWORD_ACCEPT_CACHED)) {
@@ -469,10 +467,9 @@ int ask_password_tty(
                 new_termios.c_cc[VMIN] = 1;
                 new_termios.c_cc[VTIME] = 0;
 
-                if (tcsetattr(ttyfd, TCSADRAIN, &new_termios) < 0) {
-                        r = -errno;
+                r = RET_NERRNO(tcsetattr(ttyfd, TCSADRAIN, &new_termios));
+                if (r < 0)
                         goto finish;
-                }
 
                 reset_tty = true;
         }
@@ -496,11 +493,11 @@ int ask_password_tty(
                 else
                         timeout = USEC_INFINITY;
 
-                if (flag_file)
-                        if (access(flag_file, F_OK) < 0) {
-                                r = -errno;
+                if (flag_file) {
+                        r = RET_NERRNO(access(flag_file, F_OK));
+                        if (r < 0)
                                 goto finish;
-                        }
+                }
 
                 r = ppoll_usec(pollfd, notify >= 0 ? 2 : 1, timeout);
                 if (r == -EINTR)
@@ -752,10 +749,10 @@ int ask_password_agent(
                         r = -errno;
                         goto finish;
                 }
-                if (inotify_add_watch(notify, "/run/systemd/ask-password", IN_ATTRIB /* for mtime */) < 0) {
-                        r = -errno;
+
+                r = RET_NERRNO(inotify_add_watch(notify, "/run/systemd/ask-password", IN_ATTRIB /* for mtime */));
+                if (r < 0)
                         goto finish;
-                }
         }
 
         fd = mkostemp_safe(temp);
@@ -818,10 +815,9 @@ int ask_password_agent(
         final[sizeof(final)-10] = 's';
         final[sizeof(final)-9] = 'k';
 
-        if (rename(temp, final) < 0) {
-                r = -errno;
+        r = RET_NERRNO(rename(temp, final));
+        if (r < 0)
                 goto finish;
-        }
 
         zero(pollfd);
         pollfd[FD_SOCKET].fd = socket_fd;

src/shared/barrier.c

@@ -92,7 +92,6 @@
  */
 int barrier_create(Barrier *b) {
         _unused_ _cleanup_(barrier_destroyp) Barrier *staging = b;
-        int r;
 
         assert(b);
 
@@ -104,8 +103,7 @@ int barrier_create(Barrier *b) {
         if (b->them < 0)
                 return -errno;
 
-        r = pipe2(b->pipe, O_CLOEXEC | O_NONBLOCK);
-        if (r < 0)
+        if (pipe2(b->pipe, O_CLOEXEC | O_NONBLOCK) < 0)
                 return -errno;
 
         staging = NULL;

src/shared/utmp-wtmp.c

@@ -12,6 +12,7 @@
 #include <utmpx.h>
 
 #include "alloc-util.h"
+#include "errno-util.h"
 #include "fd-util.h"
 #include "hostname-util.h"
 #include "io-util.h"
@@ -292,13 +293,15 @@ static int write_to_terminal(const char *tty, const char *message) {
         assert(message);
 
         fd = open(tty, O_WRONLY|O_NONBLOCK|O_NOCTTY|O_CLOEXEC);
-        if (fd < 0 || !isatty(fd))
+        if (fd < 0)
                 return -errno;
+        if (!isatty(fd))
+                return -ENOTTY;
 
         p = message;
         left = strlen(message);
 
-        end = now(CLOCK_MONOTONIC) + TIMEOUT_USEC;
+        end = usec_add(now(CLOCK_MONOTONIC), TIMEOUT_USEC);
 
         while (left > 0) {
                 ssize_t n;
@@ -306,19 +309,21 @@ static int write_to_terminal(const char *tty, const char *message) {
                 int k;
 
                 t = now(CLOCK_MONOTONIC);
-
                 if (t >= end)
                         return -ETIME;
 
                 k = fd_wait_for_event(fd, POLLOUT, end - t);
-                if (k < 0)
+                if (k < 0) {
+                        if (ERRNO_IS_TRANSIENT(k))
+                                continue;
                         return k;
+                }
                 if (k == 0)
                         return -ETIME;
 
                 n = write(fd, p, left);
                 if (n < 0) {
-                        if (errno == EAGAIN)
+                        if (ERRNO_IS_TRANSIENT(errno))
                                 continue;
 
                         return -errno;

src/shared/varlink.c

@@ -1025,7 +1025,7 @@ static void handle_revents(Varlink *v, int revents) {
                 if ((revents & (POLLOUT|POLLHUP)) == 0)
                         return;
 
-                varlink_log(v, "Anynchronous connection completed.");
+                varlink_log(v, "Asynchronous connection completed.");
                 v->connecting = false;
         } else {
                 /* Note that we don't care much about POLLIN/POLLOUT here, we'll just try reading and writing
@@ -1075,6 +1075,9 @@ int varlink_wait(Varlink *v, usec_t timeout) {
                 return events;
 
         r = fd_wait_for_event(fd, events, t);
+        if (r < 0 && ERRNO_IS_TRANSIENT(r)) /* Treat EINTR as not a timeout, but also nothing happened, and
+                                             * the caller gets a chance to call back into us */
+                return 1;
         if (r <= 0)
                 return r;
 
@@ -1161,8 +1164,12 @@ int varlink_flush(Varlink *v) {
                 }
 
                 r = fd_wait_for_event(v->fd, POLLOUT, USEC_INFINITY);
-                if (r < 0)
+                if (r < 0) {
+                        if (ERRNO_IS_TRANSIENT(r))
+                                continue;
+
                         return varlink_log_errno(v, r, "Poll failed on fd: %m");
+                }
 
                 assert(r != 0);