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251 lines
11 KiB
251 lines
11 KiB
From 6d1ef1fb841a0b3b4c53b560892f3570b3379dc9 Mon Sep 17 00:00:00 2001 |
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From: Lennart Poettering <lennart@poettering.net> |
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Date: Wed, 10 Jun 2015 19:24:58 +0200 |
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Subject: [PATCH] journald: don't employ inner loop for reading from incoming |
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sockets |
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Otherwise, if the socket is constantly busy we will never return to the |
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event loop, but we really need to to dispatch other (possibly more |
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high-priority) events too. Hence, return after dispatching one message |
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to the event handler, and rely on the event loop calling us back |
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right-away. |
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Fixes #125 |
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Related: #1318994 |
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Cherry-picked from: a315ac4e076c4ce7ce3e5c95792cf916d5e918c5 |
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--- |
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src/journal/journald-server.c | 204 +++++++++++++++++++++--------------------- |
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1 file changed, 100 insertions(+), 104 deletions(-) |
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diff --git a/src/journal/journald-server.c b/src/journal/journald-server.c |
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index 1eb1394d1..275224dc9 100644 |
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--- a/src/journal/journald-server.c |
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+++ b/src/journal/journald-server.c |
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@@ -1103,6 +1103,42 @@ finish: |
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int server_process_datagram(sd_event_source *es, int fd, uint32_t revents, void *userdata) { |
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Server *s = userdata; |
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+ struct ucred *ucred = NULL; |
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+ struct timeval *tv = NULL; |
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+ struct cmsghdr *cmsg; |
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+ char *label = NULL; |
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+ size_t label_len = 0, m; |
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+ struct iovec iovec; |
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+ ssize_t n; |
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+ int *fds = NULL, v = 0; |
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+ unsigned n_fds = 0; |
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+ |
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+ union { |
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+ struct cmsghdr cmsghdr; |
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+ |
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+ /* We use NAME_MAX space for the SELinux label |
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+ * here. The kernel currently enforces no |
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+ * limit, but according to suggestions from |
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+ * the SELinux people this will change and it |
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+ * will probably be identical to NAME_MAX. For |
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+ * now we use that, but this should be updated |
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+ * one day when the final limit is known. */ |
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+ uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) + |
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+ CMSG_SPACE(sizeof(struct timeval)) + |
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+ CMSG_SPACE(sizeof(int)) + /* fd */ |
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+ CMSG_SPACE(NAME_MAX)]; /* selinux label */ |
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+ } control = {}; |
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+ |
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+ union sockaddr_union sa = {}; |
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+ |
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+ struct msghdr msghdr = { |
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+ .msg_iov = &iovec, |
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+ .msg_iovlen = 1, |
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+ .msg_control = &control, |
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+ .msg_controllen = sizeof(control), |
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+ .msg_name = &sa, |
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+ .msg_namelen = sizeof(sa), |
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+ }; |
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assert(s); |
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assert(fd == s->native_fd || fd == s->syslog_fd || fd == s->audit_fd); |
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@@ -1112,119 +1148,79 @@ int server_process_datagram(sd_event_source *es, int fd, uint32_t revents, void |
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return -EIO; |
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} |
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- for (;;) { |
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- struct ucred *ucred = NULL; |
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- struct timeval *tv = NULL; |
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- struct cmsghdr *cmsg; |
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- char *label = NULL; |
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- size_t label_len = 0; |
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- struct iovec iovec; |
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- |
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- union { |
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- struct cmsghdr cmsghdr; |
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- |
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- /* We use NAME_MAX space for the SELinux label |
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- * here. The kernel currently enforces no |
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- * limit, but according to suggestions from |
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- * the SELinux people this will change and it |
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- * will probably be identical to NAME_MAX. For |
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- * now we use that, but this should be updated |
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- * one day when the final limit is known. */ |
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- uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) + |
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- CMSG_SPACE(sizeof(struct timeval)) + |
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- CMSG_SPACE(sizeof(int)) + /* fd */ |
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- CMSG_SPACE(NAME_MAX)]; /* selinux label */ |
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- } control = {}; |
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- union sockaddr_union sa = {}; |
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- struct msghdr msghdr = { |
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- .msg_iov = &iovec, |
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- .msg_iovlen = 1, |
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- .msg_control = &control, |
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- .msg_controllen = sizeof(control), |
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- .msg_name = &sa, |
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- .msg_namelen = sizeof(sa), |
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- }; |
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- |
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- ssize_t n; |
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- int *fds = NULL; |
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- unsigned n_fds = 0; |
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- int v = 0; |
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- size_t m; |
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- |
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- /* Try to get the right size, if we can. (Not all |
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- * sockets support SIOCINQ, hence we just try, but |
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- * don't rely on it. */ |
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- (void) ioctl(fd, SIOCINQ, &v); |
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- |
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- /* Fix it up, if it is too small. We use the same fixed value as auditd here. Awful! */ |
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- m = PAGE_ALIGN(MAX3((size_t) v + 1, |
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- (size_t) LINE_MAX, |
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- ALIGN(sizeof(struct nlmsghdr)) + ALIGN((size_t) MAX_AUDIT_MESSAGE_LENGTH)) + 1); |
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- |
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- if (!GREEDY_REALLOC(s->buffer, s->buffer_size, m)) |
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- return log_oom(); |
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- |
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- iovec.iov_base = s->buffer; |
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- iovec.iov_len = s->buffer_size - 1; /* Leave room for trailing NUL we add later */ |
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- |
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- n = recvmsg(fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC); |
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- if (n < 0) { |
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- if (errno == EINTR || errno == EAGAIN) |
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- return 0; |
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- |
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- log_error_errno(errno, "recvmsg() failed: %m"); |
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- return -errno; |
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- } |
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+ /* Try to get the right size, if we can. (Not all |
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+ * sockets support SIOCINQ, hence we just try, but |
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+ * don't rely on it. */ |
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+ (void) ioctl(fd, SIOCINQ, &v); |
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- CMSG_FOREACH(cmsg, &msghdr) { |
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- |
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- if (cmsg->cmsg_level == SOL_SOCKET && |
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- cmsg->cmsg_type == SCM_CREDENTIALS && |
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- cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) |
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- ucred = (struct ucred*) CMSG_DATA(cmsg); |
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- else if (cmsg->cmsg_level == SOL_SOCKET && |
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- cmsg->cmsg_type == SCM_SECURITY) { |
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- label = (char*) CMSG_DATA(cmsg); |
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- label_len = cmsg->cmsg_len - CMSG_LEN(0); |
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- } else if (cmsg->cmsg_level == SOL_SOCKET && |
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- cmsg->cmsg_type == SO_TIMESTAMP && |
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- cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval))) |
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- tv = (struct timeval*) CMSG_DATA(cmsg); |
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- else if (cmsg->cmsg_level == SOL_SOCKET && |
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- cmsg->cmsg_type == SCM_RIGHTS) { |
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- fds = (int*) CMSG_DATA(cmsg); |
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- n_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); |
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- } |
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- } |
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+ /* Fix it up, if it is too small. We use the same fixed value as auditd here. Awful! */ |
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+ m = PAGE_ALIGN(MAX3((size_t) v + 1, |
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+ (size_t) LINE_MAX, |
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+ ALIGN(sizeof(struct nlmsghdr)) + ALIGN((size_t) MAX_AUDIT_MESSAGE_LENGTH)) + 1); |
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- /* And a trailing NUL, just in case */ |
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- s->buffer[n] = 0; |
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+ if (!GREEDY_REALLOC(s->buffer, s->buffer_size, m)) |
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+ return log_oom(); |
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- if (fd == s->syslog_fd) { |
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- if (n > 0 && n_fds == 0) |
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- server_process_syslog_message(s, strstrip(s->buffer), ucred, tv, label, label_len); |
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- else if (n_fds > 0) |
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- log_warning("Got file descriptors via syslog socket. Ignoring."); |
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+ iovec.iov_base = s->buffer; |
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+ iovec.iov_len = s->buffer_size - 1; /* Leave room for trailing NUL we add later */ |
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- } else if (fd == s->native_fd) { |
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- if (n > 0 && n_fds == 0) |
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- server_process_native_message(s, s->buffer, n, ucred, tv, label, label_len); |
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- else if (n == 0 && n_fds == 1) |
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- server_process_native_file(s, fds[0], ucred, tv, label, label_len); |
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- else if (n_fds > 0) |
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- log_warning("Got too many file descriptors via native socket. Ignoring."); |
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+ n = recvmsg(fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC); |
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+ if (n < 0) { |
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+ if (errno == EINTR || errno == EAGAIN) |
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+ return 0; |
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- } else { |
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- assert(fd == s->audit_fd); |
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+ return log_error_errno(errno, "recvmsg() failed: %m"); |
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+ } |
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- if (n > 0 && n_fds == 0) |
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- server_process_audit_message(s, s->buffer, n, ucred, &sa, msghdr.msg_namelen); |
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- else if (n_fds > 0) |
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- log_warning("Got file descriptors via audit socket. Ignoring."); |
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+ CMSG_FOREACH(cmsg, &msghdr) { |
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+ |
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+ if (cmsg->cmsg_level == SOL_SOCKET && |
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+ cmsg->cmsg_type == SCM_CREDENTIALS && |
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+ cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) |
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+ ucred = (struct ucred*) CMSG_DATA(cmsg); |
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+ else if (cmsg->cmsg_level == SOL_SOCKET && |
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+ cmsg->cmsg_type == SCM_SECURITY) { |
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+ label = (char*) CMSG_DATA(cmsg); |
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+ label_len = cmsg->cmsg_len - CMSG_LEN(0); |
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+ } else if (cmsg->cmsg_level == SOL_SOCKET && |
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+ cmsg->cmsg_type == SO_TIMESTAMP && |
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+ cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval))) |
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+ tv = (struct timeval*) CMSG_DATA(cmsg); |
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+ else if (cmsg->cmsg_level == SOL_SOCKET && |
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+ cmsg->cmsg_type == SCM_RIGHTS) { |
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+ fds = (int*) CMSG_DATA(cmsg); |
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+ n_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); |
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} |
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+ } |
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+ |
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+ /* And a trailing NUL, just in case */ |
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+ s->buffer[n] = 0; |
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+ |
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+ if (fd == s->syslog_fd) { |
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+ if (n > 0 && n_fds == 0) |
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+ server_process_syslog_message(s, strstrip(s->buffer), ucred, tv, label, label_len); |
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+ else if (n_fds > 0) |
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+ log_warning("Got file descriptors via syslog socket. Ignoring."); |
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+ |
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+ } else if (fd == s->native_fd) { |
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+ if (n > 0 && n_fds == 0) |
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+ server_process_native_message(s, s->buffer, n, ucred, tv, label, label_len); |
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+ else if (n == 0 && n_fds == 1) |
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+ server_process_native_file(s, fds[0], ucred, tv, label, label_len); |
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+ else if (n_fds > 0) |
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+ log_warning("Got too many file descriptors via native socket. Ignoring."); |
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- close_many(fds, n_fds); |
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+ } else { |
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+ assert(fd == s->audit_fd); |
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+ |
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+ if (n > 0 && n_fds == 0) |
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+ server_process_audit_message(s, s->buffer, n, ucred, &sa, msghdr.msg_namelen); |
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+ else if (n_fds > 0) |
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+ log_warning("Got file descriptors via audit socket. Ignoring."); |
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} |
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+ |
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+ close_many(fds, n_fds); |
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+ return 0; |
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} |
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static int dispatch_sigusr1(sd_event_source *es, const struct signalfd_siginfo *si, void *userdata) {
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