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| author | Ori Bernstein <ori@eigenstate.org> | 2020-11-01 11:42:54 -0800 |
|---|---|---|
| committer | Ori Bernstein <ori@eigenstate.org> | 2020-11-01 11:42:54 -0800 |
| commit | dbd54342fd66fd372f5c2edd1597019814f41c9c (patch) | |
| tree | cf76f6c4109d814a7df663e38dd7fdc1a9127f12 | |
| parent | b5086c1863fe10faf48ab675f503e562ec8dfcf0 (diff) | |
| download | plan9front-dbd54342fd66fd372f5c2edd1597019814f41c9c.tar.xz | |
libbio: add aux pointer to bio
This allows us to attach additional context
to the biobuf so can read from some sort of
data structure without a global variable.
| -rw-r--r-- | sys/include/bio.h | 1 | ||||
| -rw-r--r-- | sys/man/2/bio | 12 |
2 files changed, 12 insertions, 1 deletions
diff --git a/sys/include/bio.h b/sys/include/bio.h index 2a874de31..2c5cdc8cf 100644 --- a/sys/include/bio.h +++ b/sys/include/bio.h @@ -34,6 +34,7 @@ struct Biobufhdr uchar* gbuf; /* pointer to good data in buf */ void (*errorf)(char *); /* called on error if not nil */ int (*iof)(Biobufhdr*, void *, long); /* called to do i/o */ + void *aux; /* user data */ }; struct Biobuf diff --git a/sys/man/2/bio b/sys/man/2/bio index b62a5877d..8c63870cb 100644 --- a/sys/man/2/bio +++ b/sys/man/2/bio @@ -1,6 +1,6 @@ .TH BIO 2 .SH NAME -Bopen, Bfdopen, Binit, Binits, Brdline, Brdstr, Bgetc, Bgetrune, Bgetd, Bungetc, Bungetrune, Bread, Bseek, Boffset, Bfildes, Blinelen, Bputc, Bputrune, Bprint, Bvprint, Bwrite, Bflush, Bterm, Bbuffered, Blethal \- buffered input/output +Bopen, Bfdopen, Binit, Binits, Brdline, Brdstr, Bgetc, Bgetrune, Bgetd, Bungetc, Bungetrune, Bread, Bseek, Boffset, Bfildes, Blinelen, Bputc, Bputrune, Bprint, Bvprint, Bwrite, Bflush, Bterm, Bbuffered, Blethal, Biofn \- buffered input/output .SH SYNOPSIS .ta \w'Biobuf* 'u .B #include <u.h> @@ -9,6 +9,16 @@ Bopen, Bfdopen, Binit, Binits, Brdline, Brdstr, Bgetc, Bgetrune, Bgetd, Bungetc, .br .B #include <bio.h> .PP +.ft L +.nf +.ta \w' 'u +\w' 'u +\w' 'u +\w' 'u +\w' 'u +typedef struct Biobufhdr Biobufhdr; +struct Biobufhdr { + void *aux; /* user data */ + ... /* internals */ +}; +.fi +.PP .B Biobuf* Bopen(char *file, int mode) .PP |