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S16A User’s Guide Input and Output
EDT, Inc. October, 1996 15
s16a_read
Description
Performs a read on the S16A. The UNIX 2 GB file offset bug is avoided during large amounts of input or
output, that is, reading past 2
31
does not fail. This call is not multibuffering, and no transfer is active when
it completes.
Syntax
int s16a_read(S16aDev *s16a_p, void *buf, int size);
Arguments
s16a_p S16A device handle returned from s16a_open
buf address of buffer to read into
size size of read in bytes
Return
The return value from read; errno is set by read on error.
s16a_serial_read
Description
Read a response string from the Analog Input Module.
Syntax
int s16a_serial_read(S16aDev *s16a_p, char *buf, size);
Arguments
s16a_p S16A device struct, returned from s16a_open
buf Array of characters to receive the response string from the Analog Input Module
size Number of characters in the buffer
Return
Returns the actual number of bytes transferred; or –1 on ioctl error. Sets errno on failure.