.TH sergensio_b_alloc.3 3 "20 Jul 2020"
.SH NAME
sergensio_b_alloc, sergensio_b_free, sergensio_baud_b,
sergensio_datasize_b, sergensio_parity_b, sergensio_stopbits_b,
sergensio_flowcontrol_b, sergensio_iflowcontrol_b, sergensio_sbreak_b,
sergensio_dtr_b, sergensio_rts_b \- Blocking control for serial
parameters on a sergensio
.SH SYNOPSIS
.B #include <gensio/sergensio.h>
.TP 20
.B int sergensio_b_alloc(struct sergensio *sio, struct gensio_os_funcs *o,
.br
.B                       struct sergensio_b **new_sbio);
.TP 20
.B void sergensio_b_free(struct sergensio_b *sbio);
.TP 20
.B int sergensio_baud_b(struct sergensio_b *sbio, unsigned int *baud);
.TP 20
int sergensio_datasize_b(struct sergensio_b *sbio,
.br
.B                       unsigned int *datasize);
.TP 20
.B int sergensio_parity_b(struct sergensio_b *sbio, unsigned int *parity);
.TP 20
.B int sergensio_stopbits_b(struct sergensio_b *sbio,
.br
.B                          unsigned int *stopbits);
.TP 20
.B int sergensio_flowcontrol_b(struct sergensio_b *sbio,
.br
.B                          unsigned int *flowcontrol);
.TP 20
.B int sergensio_iflowcontrol_b(struct sergensio_b *sbio,
.br
.B                           unsigned int *iflowcontrol);
.TP 20
.B int sergensio_sbreak_b(struct sergensio_b *sbio, unsigned int *breakv);
.TP 20
.B int sergensio_dtr_b(struct sergensio_b *sbio, unsigned int *dtr);
.TP 20
.B int sergensio_rts_b(struct sergensio_b *sbio, unsigned int *rts);
.TP 20
.B int sergensio_cts_b(struct sergensio_b *sbio, unsigned int *cts);
.TP 20
.B int sergensio_dcd_dsr_b(struct sergensio_b *sbio, unsigned int *dcd_dsr);
.TP 20
.B int sergensio_ri_b(struct sergensio_b *sbio, unsigned int *ri);
.SH "DESCRIPTION"
These are equivalent to the non-blocking functions (without the _b),
but block waiting for the results.  Like all synchronous I/O, this can
come with deadlock potential, so these should be used carefully.

To use these, you must first allocate a sergensio blocking data
structure using
.B sergensio_b_alloc
for use in the other functions.  This allocated value can only be used
for one operation at a time.  When you are done with it, you must free
it with
.B sergensio_b_free.

With these function, you pass a pointer to the value you want to set.
If the pointed to value is zero, the value is not set, just fetched.
If the function returns without an error, the actual current value is
returned in the passed-in pointer's destination.

Note that these do not require
.B gensio_set_sync
to work, and may be intermixed with non-blocking operations.

See the various non-blocking functions for detail on the values and
what they mean.
.SH "RETURN VALUES"
Zero is returned on success, or a gensio error on failure.
.SH "SEE ALSO"
sergensio(5), sergensio_baud(3), sergensio_datasize(3),
sergensio_parity(3), sergensio_stopbits(3), sergensio_flowcontrol(3),
sergensio_iflowonctrol(3), sergensio_sbreak(3), sergensio_dtr(3),
sergensio_rts(3)
.SH AUTHOR
.PP
Corey Minyard <minyard@acm.org>