EPERMEPERM — Operation Not Permitted
The process does not have the required permissions to perform the requested operation.
ENOBUFSThe system does not have enough network buffer space to complete the operation.
The kernel's network buffer pool is exhausted. This occurs under extremely high network load when socket buffers cannot be allocated.
Increase network buffer limits with sysctl (net.core.rmem_max, net.core.wmem_max). Reduce the number of concurrent connections. Close unused sockets.
EPERMThe process does not have the required permissions to perform the requested operation.
EIOA physical or low-level I/O error occurred during a read or write operation.
SIGFPE (8)An arithmetic error occurred, such as division by zero or floating-point overflow.
ENETRESETThe network connection was reset due to a network-level event.
E2BIGThe total size of the argument list and environment variables passed to exec() exceeds the system limit.
EAFNOSUPPORTThe specified address family is not supported by the protocol or socket implementation.