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An earlier attempt (ad6265786871) to resolve this condition on the
router's side added a new issue: the app could get a request before
acquiring a port.
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Missing error log messages added.
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The setuid/setgid syscalls requires root capabilities but if the kernel
supports unprivileged user namespace then the child process has the full
set of capabilities in the new namespace, then we can allow setting "user"
and "group" in such cases (this is a common security use case).
Tests were added to ensure user gets meaningful error messages for
uid/gid mapping misconfigurations.
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This is required to avoid include cycles, as some nxt_clone_* functions
depend on the credential structures, but nxt_process depends on clone
structures.
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Introduces the functions nxt_process_init_create() and
nxt_process_init_creds_set().
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- Introduced nxt_runtime_process_port_create().
- Moved nxt_process_use() into nxt_process.c from nxt_runtime.c.
- Renamed nxt_runtime_process_remove_pid() as nxt_runtime_process_remove().
- Some public functions transformed to static.
This closes #327 issue on GitHub.
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Previously, stored configuration wasn't reread on controller
process restart, which resulted in segmentation fault.
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- Main process should be connected to all other processes.
- Controller should be connected to Router.
- Router should be connected to Controller and all Workers.
- Workers should be connected to Router worker thread ports only.
This filtering helps to avoid unnecessary communication and various errors
during massive application workers stop / restart.
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Two different router threads may send different requests to single
application worker. In this case shared memory fds from worker
to router will be send over 2 different router ports. These fds
will be received and processed by different threads in any order.
This patch made possible to add incoming shared memory segments in
arbitrary order. Additionally, array and memory pool are no longer
used to store segments because of pool's single threaded nature.
Custom array-like structure nxt_port_mmaps_t introduced.
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This helps to decouple process removal from port memory pool cleanups.
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Memory pool is not used by port_hash and it was a mistake to pass it into
'add' and 'remove' functions. port_hash enrties are allocated from heap.
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Previously, reconfiguration might fail right after the daemon start
if the router process wasn't ready yet.
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Configuration and building example:
./configure
./configure python
./configure php
./configure go
make all
or
./configure
make nginext
./configure python
make python
./configure php
make php
./configure go
make go
Modules configuration options and building examples:
./configure python --module=python2 --config=python2.7-config
make python2
./configure php --module=php7 --config=php7.0-config
--lib-path=/usr/local/php7.0
make php7
./configure go --go=go1.6 --go-path=${HOME}/go1.6
make go1.6
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Used for connection mem pool cleanup, which can be used by buffers.
Used for port mem pool to safely destroy linked process.
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Application process start request DATA message from router to master.
Master notifies router via NEW_PORT message after worker process become ready.
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- request to connection mapping in engine;
- requests queue in connection;
- engine port creation;
- connected ports hash for each process;
- engine port data messages processing (app responses);
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Usage:
b = nxt_port_mmap_get_buf(task, port, size);
b->mem.free = nxt_cpymem(b->mem.free, data, size);
nxt_port_socket_write(task, port, NXT_PORT_MSG_DATA, -1, 0, b);
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The cycle has been renamed to the runtime.
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