After running ./configure && make on AIX:
assuan-socket-server.c: In function 'accept_connection_bottom':
assuan-socket-server.c:134:9: warning: implicit declaration of function 'getpeereid'; did you mean 'getpgid'? [-Wimplicit-function-declaration]
134 | if (getpeereid (fd, &ctx->peercred.uid, &ctx->peercred.gid) != -1)
| ^~~~~~~~~~
| getpgidThis platform needs _ALL_SOURCE defined for this function.
Correction, the _ALL_SOURCE definition only applies if __cplusplus is defined... Strange platform...
Yep, I wrote a small client and server just to verify that it is functional.
Here is the result of calling getpeerid on the socket from accept:
$ ./server uid: 11013, gid: 1, message: hello `
Here is the user that I have on that system:
$ id uid=11013(collinfunk) gid=1(staff) groups=1(staff)
I use GCC cfarm for testing AIX by the way, since AIX would be hard to use otherwise [1]. If you ever have the need to test there.
The AIX machine is provided by OSU though, and since the current US president hates colleges, it will likely be gone soon [2]. :(
[1] https://portal.cfarm.net/
[2] https://osuosl.org/blog/osl-future/