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Can I use facil.io to communicate with a wss server in embedded system? #74

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Sarah-Wang opened this issue Sep 27, 2019 · 5 comments
Open

Can I use facil.io to communicate with a wss server in embedded system? #74

Sarah-Wang opened this issue Sep 27, 2019 · 5 comments
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@Sarah-Wang
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I want to use c code in embedded linux system to communicate with a thirdparty websocket server by wss protocol. Would facil.io be a good choice? Is there any completed example of how to realize that function?
Thank you very much!
@boazsegev
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Hi @Sarah-Wang.

Thank you for your question.

I believe facil.io would be a good choice for a C based WebSocket client on an embedded system.

I didn't test facil.io on embedded systems, but I did my best to keep the code portable, so it should work in different POSIX environments (such as embedded Linux).

Although there's an HTTP client example, there's no WebSocket client example in the facil.io repo.

A generic, slightly more advance, WebSocket client was programmed into the iodine Ruby server using facil.io, maybe you could use that code as an example.

Also, please note that there are some specific considerations for embedded systems that relate to the fact that you will have limited resources (less memory, etc').

You would need to explore many of the compilation flags and runtime settings to minimize memory usage.

For example, you might want to compile facil.io with FIO_MAX_SOCK_CAPACITY set to a lower value and fix HTTP_BUSY_UNLESS_HAS_FDS as well (for example, -DFIO_MAX_SOCK_CAPACITY=32).

This is especially true when using facil.io only as a client to a single remote server (even then, it's important that FIO_MAX_SOCK_CAPACITY has room for stdin, stdout and stderr in addition to any actual sockets you need, so make the value no less then 16 if possible.

Compilation flags can be easily added to the makefile. For example:

FLAGS:=FIO_MAX_SOCK_CAPACITY=16 HTTP_BUSY_UNLESS_HAS_FDS=0

Since you're only using client mode, you might not need the default mime type registry. It will just take memory and could probably be safely removed.

Depending how limited your memory is, you might want to avoid or make some changes to the custom memory allocator, since it will reserve 8Mb of memory per CPU core, which might be more then you need. Consider (though it will make things slower):

FLAGS:=FIO_MAX_SOCK_CAPACITY=32 FIO_FORCE_MALLOC

Some runtime flags will also be important to make sure the WebSocket connection doesn't use too much memory. For example, the ws_max_msg_size setting can be used to disconnect a WebSocket connection if a message exceeds this limit.

Please let me know how it goes and if there's anything I can do to help make facil.io more suited to embedded systems.

Good luck!

Kindly,
Bo.

@Sarah-Wang
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Thank you very much for your kind help!
I will have a try and let you know my progress.

@Sarah-Wang
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Sarah-Wang commented Sep 27, 2019 •
edited by boazsegev
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I would like to try it on my Ubuntu system firstly, and make sure the whole process is OK.
But I failed to build it.
My PC information is :
$ uname -a
Linux Ubuntu1404 4.4.0-97-generic #120~14.04.1-Ubuntu SMP Wed Sep 20 15:53:13 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

The source file is : boazsegev-facil.io-0.7.2-0-gef041d9.tar.gz

sarah@Ubuntu1404:~/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/build$ make
Scanning dependencies of target facil.io
[  5%] Building C object CMakeFiles/facil.io.dir/lib/facil/fio.o
In file included from /home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:8:0:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h: In function ‘fio_risky_hash’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:2477:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (size_t i = len >> 5; i; --i) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:2477:3: note: use option -std=c99 or -std=gnu99 to compile your code
In file included from /home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:136:0:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h: In function ‘fio_uuid_links_free’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:6028:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
     for (FIO_NAME(_ordered_s_) *pos = s->ordered; pos < end; ++pos) {
     ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h: In function ‘fio_uuid_links_rehash’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:6294:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
     for (FIO_NAME(_ordered_s_) *pos = set->ordered; pos < end; ++pos) {
     ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_clear_fd’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:5839:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (__typeof__((set)->ordered) container = (set)->ordered;                  \
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:330:5: note: in expansion of macro ‘FIO_SET_FOR_LOOP’
     FIO_SET_FOR_LOOP(&links, pos) {
     ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_local_addr’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:486:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (struct addrinfo *pos = info; pos; pos = pos->ai_next) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_defer_thread_pool_join’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:1106:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (size_t i = 0; i < pool->thread_count; ++i) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_defer_thread_pool_new’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:1120:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (size_t i = 0; i < count; ++i) {
   ^
In file included from /home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:15:0:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_timer_add_order’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:3288:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (fio_ls_embd_s *node = (list)->next; node != (list); node = node->next)
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:1237:3: note: in expansion of macro ‘FIO_LS_EMBD_FOR’
   FIO_LS_EMBD_FOR(&fio_timers, node) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_poll_close’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:1639:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (int i = 0; i < 3; ++i) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_poll_init’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:1649:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (int i = 0; i < 3; ++i) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:1654:12: error: redefinition of ‘i’
   for (int i = 1; i < 3; ++i) {
            ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:1649:12: note: previous definition of ‘i’ was here
   for (int i = 0; i < 3; ++i) {
            ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:1654:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (int i = 1; i < 3; ++i) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_poll’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:1729:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (int j = 0; j < internal_count; ++j) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:1733:7: error: ‘for’ loop initial declarations are only allowed in C99 mode
       for (int i = 0; i < active_count; i++) {
       ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_tcp_socket’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:2509:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
     for (struct addrinfo *i = addrinfo; i != NULL; i = i->ai_next) {
     ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:2536:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
     for (struct addrinfo *i = addrinfo; i; i = i->ai_next) {
     ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_flush_all’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:3056:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (uintptr_t i = 0; i <= fio_data->max_protocol_fd; ++i) {
   ^
In file included from /home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:15:0:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_state_callback_remove’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:3288:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (fio_ls_embd_s *node = (list)->next; node != (list); node = node->next)
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:3344:3: note: in expansion of macro ‘FIO_LS_EMBD_FOR’
   FIO_LS_EMBD_FOR(&callback_collection[c_type].callbacks, pos) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_state_callback_force’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:3288:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (fio_ls_embd_s *node = (list)->next; node != (list); node = node->next)
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:3375:5: note: in expansion of macro ‘FIO_LS_EMBD_FOR’
     FIO_LS_EMBD_FOR(&callback_collection[c_type].callbacks, pos) {
     ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:3384:61: error: redefinition of ‘pos’
     FIO_LS_EMBD_FOR(&callback_collection[c_type].callbacks, pos) {
                                                             ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:3288:23: note: in definition of macro ‘FIO_LS_EMBD_FOR’
   for (fio_ls_embd_s *node = (list)->next; node != (list); node = node->next)
                       ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:3375:61: note: previous definition of ‘pos’ was here
     FIO_LS_EMBD_FOR(&callback_collection[c_type].callbacks, pos) {
                                                             ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:3288:23: note: in definition of macro ‘FIO_LS_EMBD_FOR’
   for (fio_ls_embd_s *node = (list)->next; node != (list); node = node->next)
                       ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:3288:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (fio_ls_embd_s *node = (list)->next; node != (list); node = node->next)
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:3384:5: note: in expansion of macro ‘FIO_LS_EMBD_FOR’
     FIO_LS_EMBD_FOR(&callback_collection[c_type].callbacks, pos) {
     ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:3398:61: error: redefinition of ‘pos’
     FIO_LS_EMBD_FOR(&callback_collection[c_type].callbacks, pos) {
                                                             ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:3288:23: note: in definition of macro ‘FIO_LS_EMBD_FOR’
   for (fio_ls_embd_s *node = (list)->next; node != (list); node = node->next)
                       ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:3384:61: note: previous definition of ‘pos’ was here
     FIO_LS_EMBD_FOR(&callback_collection[c_type].callbacks, pos) {
                                                             ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:3288:23: note: in definition of macro ‘FIO_LS_EMBD_FOR’
   for (fio_ls_embd_s *node = (list)->next; node != (list); node = node->next)
                       ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:3288:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (fio_ls_embd_s *node = (list)->next; node != (list); node = node->next)
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:3398:5: note: in expansion of macro ‘FIO_LS_EMBD_FOR’
     FIO_LS_EMBD_FOR(&callback_collection[c_type].callbacks, pos) {
     ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_state_callback_on_fork’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:3435:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (size_t i = 0; i < (FIO_CALL_NEVER + 1); ++i) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_state_callback_clear_all’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:3440:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (size_t i = 0; i < (FIO_CALL_NEVER + 1); ++i) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_on_fork’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:3512:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (size_t i = 0; i < limit; ++i) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_lib_init’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:3627:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (ssize_t i = 0; i < capa; ++i) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_worker_cleanup’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:3802:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (size_t i = 0; i <= fio_data->max_protocol_fd; ++i) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:3809:15: error: redefinition of ‘i’
   for (size_t i = 0; i <= fio_data->max_protocol_fd; ++i) {
               ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:3802:15: note: previous definition of ‘i’ was here
   for (size_t i = 0; i <= fio_data->max_protocol_fd; ++i) {
               ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:3809:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (size_t i = 0; i <= fio_data->max_protocol_fd; ++i) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_start’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:3933:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
     for (int i = 0; i < args.workers && fio_data->active; ++i) {
     ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_listen_on_data’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:4522:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (int i = 0; i < 4; ++i) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_listen_on_data_tls’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:4532:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (int i = 0; i < 4; ++i) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_listen_on_data_tls_alpn’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:4543:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (int i = 0; i < 4; ++i) {
   ^
In file included from /home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:5178:0:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h: In function ‘fio_ch_set_free’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:6028:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
     for (FIO_NAME(_ordered_s_) *pos = s->ordered; pos < end; ++pos) {
     ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h: In function ‘fio_ch_set_rehash’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:6294:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
     for (FIO_NAME(_ordered_s_) *pos = set->ordered; pos < end; ++pos) {
     ^
In file included from /home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:5183:0:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h: In function ‘fio_meta_ary_free’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:4892:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
     for (size_t i = ary->start; i < count; ++i) {
     ^
In file included from /home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:5189:0:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h: In function ‘fio_engine_set_free’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:6028:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
     for (FIO_NAME(_ordered_s_) *pos = s->ordered; pos < end; ++pos) {
     ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h: In function ‘fio_engine_set_rehash’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:6294:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
     for (FIO_NAME(_ordered_s_) *pos = set->ordered; pos < end; ++pos) {
     ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_pubsub_on_channel_create’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:5839:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (__typeof__((set)->ordered) container = (set)->ordered;                  \
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:5537:3: note: in expansion of macro ‘FIO_SET_FOR_LOOP’
   FIO_SET_FOR_LOOP(&fio_postoffice.engines.set, pos) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_pubsub_on_channel_destroy’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:5839:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (__typeof__((set)->ordered) container = (set)->ordered;                  \
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:5551:3: note: in expansion of macro ‘FIO_SET_FOR_LOOP’
   FIO_SET_FOR_LOOP(&fio_postoffice.engines.set, pos) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_pubsub_reattach’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:5839:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (__typeof__((set)->ordered) container = (set)->ordered;                  \
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:5614:3: note: in expansion of macro ‘FIO_SET_FOR_LOOP’
   FIO_SET_FOR_LOOP(&fio_postoffice.pubsub.channels, pos) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:5624:55: error: redefinition of ‘pos’
   FIO_SET_FOR_LOOP(&fio_postoffice.patterns.channels, pos) {
                                                       ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:5839:35: note: in definition of macro ‘FIO_SET_FOR_LOOP’
   for (__typeof__((set)->ordered) container = (set)->ordered;                  \
                                   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:5614:53: note: previous definition of ‘pos’ was here
   FIO_SET_FOR_LOOP(&fio_postoffice.pubsub.channels, pos) {
                                                     ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:5839:35: note: in definition of macro ‘FIO_SET_FOR_LOOP’
   for (__typeof__((set)->ordered) container = (set)->ordered;                  \
                                   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:5839:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (__typeof__((set)->ordered) container = (set)->ordered;                  \
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:5624:3: note: in expansion of macro ‘FIO_SET_FOR_LOOP’
   FIO_SET_FOR_LOOP(&fio_postoffice.patterns.channels, pos) {
   ^
In file included from /home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:15:0:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_publish2channel’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:3288:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (fio_ls_embd_s *node = (list)->next; node != (list); node = node->next)
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:5741:3: note: in expansion of macro ‘FIO_LS_EMBD_FOR’
   FIO_LS_EMBD_FOR(&ch->subscriptions, pos) {
   ^
In file included from /home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:5189:0:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_publish2process’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:5839:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (__typeof__((set)->ordered) container = (set)->ordered;                  \
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:5788:5: note: in expansion of macro ‘FIO_SET_FOR_LOOP’
     FIO_SET_FOR_LOOP(&fio_postoffice.patterns.channels, p) {
     ^
In file included from /home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:5822:0:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h: In function ‘fio_sub_hash_free’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:6028:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
     for (FIO_NAME(_ordered_s_) *pos = s->ordered; pos < end; ++pos) {
     ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h: In function ‘fio_sub_hash_rehash’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:6294:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
     for (FIO_NAME(_ordered_s_) *pos = set->ordered; pos < end; ++pos) {
     ^
In file included from /home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:15:0:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_cluster_on_close’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:3346:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (fio_ls_s *pos = (list)->next; pos != (list); pos = pos->next)
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:6028:5: note: in expansion of macro ‘FIO_LS_FOR’
     FIO_LS_FOR(&cluster_data.clients, pos) {
     ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_cluster_server_sender’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:3346:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (fio_ls_s *pos = (list)->next; pos != (list); pos = pos->next)
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:6084:3: note: in expansion of macro ‘FIO_LS_FOR’
   FIO_LS_FOR(&cluster_data.clients, pos) {
   ^
In file included from /home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:5822:0:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_cluster_on_connect’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:5839:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (__typeof__((set)->ordered) container = (set)->ordered;                  \
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:6288:3: note: in expansion of macro ‘FIO_SET_FOR_LOOP’
   FIO_SET_FOR_LOOP(&fio_postoffice.pubsub.channels, pos) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:6296:55: error: redefinition of ‘pos’
   FIO_SET_FOR_LOOP(&fio_postoffice.patterns.channels, pos) {
                                                       ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:5839:35: note: in definition of macro ‘FIO_SET_FOR_LOOP’
   for (__typeof__((set)->ordered) container = (set)->ordered;                  \
                                   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:6288:53: note: previous definition of ‘pos’ was here
   FIO_SET_FOR_LOOP(&fio_postoffice.pubsub.channels, pos) {
                                                     ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:5839:35: note: in definition of macro ‘FIO_SET_FOR_LOOP’
   for (__typeof__((set)->ordered) container = (set)->ordered;                  \
                                   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:5839:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (__typeof__((set)->ordered) container = (set)->ordered;                  \
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:6296:3: note: in expansion of macro ‘FIO_SET_FOR_LOOP’
   FIO_SET_FOR_LOOP(&fio_postoffice.patterns.channels, pos) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_pubsub_on_fork’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:5839:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (__typeof__((set)->ordered) container = (set)->ordered;                  \
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:6469:3: note: in expansion of macro ‘FIO_SET_FOR_LOOP’
   FIO_SET_FOR_LOOP(&fio_postoffice.filters.channels, pos) {
   ^
In file included from /home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:15:0:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:3288:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (fio_ls_embd_s *node = (list)->next; node != (list); node = node->next)
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:6473:5: note: in expansion of macro ‘FIO_LS_EMBD_FOR’
     FIO_LS_EMBD_FOR(&pos->obj->subscriptions, n) {
     ^
In file included from /home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:5822:0:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:6477:53: error: redefinition of ‘pos’
   FIO_SET_FOR_LOOP(&fio_postoffice.pubsub.channels, pos) {
                                                     ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:5839:35: note: in definition of macro ‘FIO_SET_FOR_LOOP’
   for (__typeof__((set)->ordered) container = (set)->ordered;                  \
                                   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:6469:54: note: previous definition of ‘pos’ was here
   FIO_SET_FOR_LOOP(&fio_postoffice.filters.channels, pos) {
                                                      ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:5839:35: note: in definition of macro ‘FIO_SET_FOR_LOOP’
   for (__typeof__((set)->ordered) container = (set)->ordered;                  \
                                   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:5839:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (__typeof__((set)->ordered) container = (set)->ordered;                  \
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:6477:3: note: in expansion of macro ‘FIO_SET_FOR_LOOP’
   FIO_SET_FOR_LOOP(&fio_postoffice.pubsub.channels, pos) {
   ^
In file included from /home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:15:0:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:3288:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (fio_ls_embd_s *node = (list)->next; node != (list); node = node->next)
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:6481:5: note: in expansion of macro ‘FIO_LS_EMBD_FOR’
     FIO_LS_EMBD_FOR(&pos->obj->subscriptions, n) {
     ^
In file included from /home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:5822:0:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:6485:55: error: redefinition of ‘pos’
   FIO_SET_FOR_LOOP(&fio_postoffice.patterns.channels, pos) {
                                                       ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:5839:35: note: in definition of macro ‘FIO_SET_FOR_LOOP’
   for (__typeof__((set)->ordered) container = (set)->ordered;                  \
                                   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:6477:53: note: previous definition of ‘pos’ was here
   FIO_SET_FOR_LOOP(&fio_postoffice.pubsub.channels, pos) {
                                                     ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:5839:35: note: in definition of macro ‘FIO_SET_FOR_LOOP’
   for (__typeof__((set)->ordered) container = (set)->ordered;                  \
                                   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:5839:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (__typeof__((set)->ordered) container = (set)->ordered;                  \
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:6485:3: note: in expansion of macro ‘FIO_SET_FOR_LOOP’
   FIO_SET_FOR_LOOP(&fio_postoffice.patterns.channels, pos) {
   ^
In file included from /home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:15:0:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:3288:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (fio_ls_embd_s *node = (list)->next; node != (list); node = node->next)
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:6489:5: note: in expansion of macro ‘FIO_LS_EMBD_FOR’
     FIO_LS_EMBD_FOR(&pos->obj->subscriptions, n) {
     ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘arena_lock’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:7059:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
     for (size_t i = (size_t)(arena - arenas); i < memory.cores; ++i) {
     ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_malloc_after_fork’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:7085:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (size_t i = 0; i < memory.cores; ++i) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘block_free’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:7134:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (size_t i = 0; i < FIO_MEMORY_BLOCKS_PER_ALLOCATION; ++i) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘block_new’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:7171:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (int i = 1; i < FIO_MEMORY_BLOCKS_PER_ALLOCATION; ++i) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_mem_destroy’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:7312:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (size_t i = 0; i < memory.cores; ++i) {
   ^
In file included from /home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:15:0:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.h:3288:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (fio_ls_embd_s *node = (list)->next; node != (list); node = node->next)
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:7322:5: note: in expansion of macro ‘FIO_LS_EMBD_FOR’
     FIO_LS_EMBD_FOR(&memory.available, node) { ++count; }
     ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_rand_bytes’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:7487:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (size_t i = (len >> 5); i; --i) {
   ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c: In function ‘fio_siphash_xy’:
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:7616:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
     for (size_t i = 0; i < x; ++i) {
     ^
/home/sarah/ws_test/facil.io/wsapp/boazsegev-facil.io-ef041d9/lib/facil/fio.c:7657:3: error: ‘for’ loop initial declarations are only allowed in C99 mode
   for (size_t i = 0; i < y; ++i) {
   ^
make[2]: *** [CMakeFiles/facil.io.dir/lib/facil/fio.o] Error 1
make[1]: *** [CMakeFiles/facil.io.dir/all] Error 2
make: *** [all] Error 2

@boazsegev
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The facil.io library requires C99.

From the errors, it appears your compiler either doesn't support C99 or was instructed to use an earlier draft (such as, perhaps, ANSI C?).

Which compiler are you using?

Also, on a more personal preference / note: I don't use CMake, I use GNU make. The CMake support isn't regularly tested (it was added by someone else who tested it).

@Sarah-Wang
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Thank you for your help!
My PC is ubuntu 14.04 and I changed to another PC unbuntu 16.04, it was complied successfully using cmak.

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@boazsegev @Sarah-Wang