There is no such parameter called `chroot_prefix`. I will assume you are asking about `api_prefix`.
Running VPP creates shared memory segments under /dev/shm. By default (no prefix provided), these files are called global_vm and vpe-api. Multiple VPP instances' names would collide and to be able to run more than one VPP, you need to supply unique prefix to 2nd, 3rd, etc. VPP instance. This turns shared memory file names for those instances to <prefix>-global_vm and <prefix>-vpe-api. When API bindings are connecting to VPP, they are using these files under /dev/shm. Thus, to connect, the same prefix needs to be supplied to VPP and client. It's called api-segment in the startup config. https://wiki.fd.io/view/VPP/Command-line_Arguments#.22api-segment.22_parameters Quoting wangchuan...@163.com (2018-09-15 11:46:54) > Hi Klement, > I change the vapi_c_test.c and let the 3rd param[chroot_prefix == > NULL] of 'vapi_connect', and all pass! > I have not quite understand this parameter "chroot_prefix" by reading the > code. > Explain briefly ,please? > Thanks a lot! > > -------------------------------------------------------------------------- > > wangchuan...@163.com > > > From: [1]wangchuan...@163.com > Date: 2018-09-15 09:23 > To: [2]Klement Sekera -X (ksekera - PANTHEON TECHNOLOGIES at Cisco); > [3]Ole Troan > CC: [4]Dave Barach (dbarach); [5]vpp-dev > Subject: Re: Re: [vpp-dev] VPP's C-type-api example > Hi Klement, > I do not understande your mean. VPP cmdline? > I want to make my ext-program who can initialize the running vpp-service > not by vppctl-shell > "systemctl start VPP" without any change for vpp-code and > startup.conf. > Can you describe their relationship? > My executable program name is "test", and how can i connect to vpp? > > -------------------------------------------------------------------------- > > wangchuan...@163.com > > > From: [6]Klement Sekera > Date: 2018-09-14 19:55 > To: [7]wangchuan...@163.com; [8]Ole Troan > CC: [9]Dave Barach (dbarach); [10]vpp-dev > Subject: Re: [vpp-dev] VPP's C-type-api example > And what is your vpp cmdline? is vpp running with "my-api-test" api > prefix? > > Quoting wangchuan...@163.com (2018-09-14 07:25:06) > > sorry， > > That my carelessness. Whole cmd as root is : #./test > "/my-api" > > "my-api-test" > > And vpp_api_test can connect to vpp. > > > > > > -------------------------------------------------------------------------- > > > > wangchuan...@163.com > > > > > > From: [1]Ole Troan > > Date: 2018-09-14 00:35 > > To: [2]wangchuanguo > > CC: [3]Klement Sekera -X (ksekera - PANTHEON TECHNOLOGIES at > Cisco); > > [4]Dave Barach (dbarach); [5]vpp-dev > > Subject: Re: [vpp-dev] VPP's C-type-api example > > > 1、as root, install the rpm(vpp-selinux, vpp-lib, vpp-18.04, > > vpp-plugins), start service vpp and I come into vppctl. > > > 2、I copy test/ext/vapi_c_test.c to main.c(a new file, a new > dir). > > > compile using: gcc -std=gnu99 -g -Wall -pthread > > -I/usr/include/ -lvppinfra -lvlibmemoryclient -lsvm -lpthread > -lcheck > > -lrt -lm -lvapiclient -lsubunit main.c -o test > > > 3、then, #./test > > > But it shows vl_map_shmem:639: region init fail > > > > That’s an indication that it cannot connect to VPP. > > Can vpp_api_test connect? > > > > Cheers, > > Ole > > > > > > > > > > wangchuan...@163.com > > > > > > From: Ole Troan > > > Date: 2018-09-13 21:44 > > > To: wangchuan...@163.com > > > CC: Klement Sekera -X (ksekera - PANTHEON TECHNOLOGIES at > Cisco); Dave > > Barach (dbarach); vpp-dev > > > Subject: Re: [vpp-dev] VPP's C-type-api example > > > > i am be root > > > > > > Then you must provide more details. > > > > > > Cheers, > > > Ole > > > > > > > > > > > > > > wangchuan...@163.com > > > > > > > > From: Ole Troan > > > > Date: 2018-09-13 21:26 > > > > To: wangchuan...@163.com > > > > CC: Klement Sekera -X (ksekera - PANTHEON TECHNOLOGIES at > Cisco); > > Dave Barach (dbarach); vpp-dev > > > > Subject: Re: [vpp-dev] VPP's C-type-api example > > > > > But I got some error when using vapi - vapi_connect as " > > vl_map_shmem:639: region init fail “. > > > > > > > > Permission error? > > > > Run client as root, or configure VPP to set permissions on > API > > shared memory. > > > > > > > > In VPP startup: > > > > api-segment { uid <foo> gid <foo> } > > > > > > > > Cheers, > > > > Ole > > > > > > > > > And my mem : MemFree: 220036 kB | > > HugePages_Total: 679 | HugePages_Free: 627 > > > > > Help please! > > > > > > > > > > My code: > > > > > int main() > > > > > { > > > > > vapi_ctx_t ctx; > > > > > vapi_error_e rv = vapi_ctx_alloc (&ctx); > > > > > vapi_msg_show_version *sv = vapi_alloc_show_version > (ctx); > > > > > rv = vapi_connect (ctx, app_name, api_prefix, > > max_outstanding_requests, > > > > > response_queue_size, > VAPI_MODE_BLOCKING); > > > > > rv = vapi_send (ctx, sv); > > > > > vapi_msg_show_version_reply *reply; > > > > > rv = vapi_recv (ctx, (void **) &reply, NULL, 0, 0); > > > > > if(reply != NULL) > > > > > printf("ret[%d] program[%s] version[%s] \n > build_date[%s] > > build_directory[%s]\n", reply->payload.retval, > reply->payload.program, > > reply->payload.version, reply->payload.build_date, > > reply->payload.build_directory); > > > > > else > > > > > printf("show version return none\n"); > > > > > rv = vapi_disconnect (ctx); > > > > > vapi_ctx_free (ctx); > > > > > printf("end\n"); > > > > > return 0; > > > > > } > > > > > > > > > > wangchuan...@163.com > > > > > > > > > > From: Klement Sekera > > > > > Date: 2018-09-13 17:02 > > > > > To: Ole Troan; wangchuanguo > > > > > CC: Dave Barach (dbarach); vpp-dev > > > > > Subject: Re: [vpp-dev] VPP's C-type-api example > > > > > You can also check out the test/ext directory for > vapi_c_test.c > > and > > > > > vapi_cpp_test.cpp, which are unittests for these bindings > and > > there is > > > > > also an example of _dump API call. > > > > > > > > > > Regards, > > > > > Klement > > > > > > > > > > Quoting Ole Troan (2018-09-13 09:33:14) > > > > > > Hi again, > > > > > > > > > > > > > I am in the beginning of using-c-api. Should I > not > > follow (src/vpp-api/client) ? > > > > > > > Can you please show me a fun-name and a example of > the higher > > level C API? > > > > > > > > > > > > That’s right, I wouldn’t recommend using the > src/vpp-aoi/client > > API unless you are building a new language binding. > > > > > > > > > > > > If you need a C interface you should use VAPI. > > > > > > > > > > > > See interface.api.vapi.h (auto-generated) for > > sw_interface_dump() > > > > > > > > > > > > static inline vapi_error_e > vapi_sw_interface_dump(struct > > vapi_ctx_s *ctx, > > > > > > vapi_msg_sw_interface_dump *msg, > > > > > > vapi_error_e (*callback)(struct vapi_ctx_s *ctx, > > > > > > void *callback_ctx, > > > > > > vapi_error_e rv, > > > > > > bool is_last, > > > > > > > vapi_payload_sw_interface_details > > *reply), > > > > > > void *callback_ctx) > > > > > > > > > > > > > > > > > > src/vpp-api/vapi/vapi_doc.md for documentation. > > > > > > > > > > > > To get a feel of how the API works, at even higher > level you can > > play with the Python language binding. > > > > > > > > > > > > Best regards, > > > > > > Ole > > > > > > > > > > > > > > > > > > > > > > > > -=-=-=-=-=-=-=-=-=-=-=- > > > > > > Links: You receive all messages sent to this group. > > > > > > > > > > > > View/Reply Online (#10481): > > https://lists.fd.io/g/vpp-dev/message/10481 > > > > > > Mute This Topic: https://lists.fd.io/mt/25510961/675704 > > > > > > Group Owner: vpp-dev+ow...@lists.fd.io > > > > > > Unsubscribe: https://lists.fd.io/g/vpp-dev/unsub > > [ksek...@cisco.com] > > > > > > -=-=-=-=-=-=-=-=-=-=-=- > > > > References > > > > Visible links > > 1. mailto:otr...@employees.org > > 2. mailto:wangchuan...@163.com > > 3. mailto:ksek...@cisco.com > > 4. mailto:dbar...@cisco.com > > 5. mailto:vpp-dev@lists.fd.io > > References > > Visible links > 1. mailto:wangchuan...@163.com > 2. mailto:ksek...@cisco.com > 3. mailto:otr...@employees.org > 4. mailto:dbar...@cisco.com > 5. mailto:vpp-dev@lists.fd.io > 6. mailto:ksek...@cisco.com > 7. mailto:wangchuan...@163.com > 8. mailto:otr...@employees.org > 9. mailto:dbar...@cisco.com > 10. mailto:vpp-dev@lists.fd.io
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