port_call flags?

Vance Shipley vances@REDACTED
Tue Aug 19 16:10:38 CEST 2003

The driver callback call() has a "flags" field which is undocumented.
The erl_driver.h header file includes a define which suggests it's use:

/* Constants for return flags from the 'port_call' callback */

Can anyone provide me some insight about this?


int call(ErlDrvData drv_data, unsigned int command,
	char *buf, int len, char **rbuf, int rlen,
	unsigned int *flags)

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