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author | rsc <devnull@localhost> | 2003-12-06 18:08:52 +0000 |
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committer | rsc <devnull@localhost> | 2003-12-06 18:08:52 +0000 |
commit | d3df308747ee4d1fcc063a348dcf1146b390bda7 (patch) | |
tree | a204b027256ec29b110caaa86100cbd701808b5b /src/libfs/read.c | |
parent | e97ceade5e1bba5787e39429384336fa37797906 (diff) | |
download | plan9port-d3df308747ee4d1fcc063a348dcf1146b390bda7.tar.gz plan9port-d3df308747ee4d1fcc063a348dcf1146b390bda7.tar.bz2 plan9port-d3df308747ee4d1fcc063a348dcf1146b390bda7.zip |
File system stuff.
Diffstat (limited to 'src/libfs/read.c')
-rw-r--r-- | src/libfs/read.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/src/libfs/read.c b/src/libfs/read.c new file mode 100644 index 00000000..ca6c628c --- /dev/null +++ b/src/libfs/read.c @@ -0,0 +1,48 @@ +/* Copyright (C) 2003 Russ Cox, Massachusetts Institute of Technology */ +/* See COPYRIGHT */ + +#include <u.h> +#include <libc.h> +#include <fcall.h> +#include <fs.h> +#include "fsimpl.h" + +long +fspread(Fid *fid, void *buf, long n, vlong offset) +{ + Fcall tx, rx; + void *freep; + + tx.type = Tread; + if(offset == -1){ + qlock(&fid->lk); + tx.offset = fid->offset; + qunlock(&fid->lk); + }else + tx.offset = offset; + tx.count = n; + + fsrpc(fid->fs, &tx, &rx, &freep); + if(rx.type == Rerror){ + werrstr("%s", rx.ename); + free(freep); + return -1; + } + if(rx.count){ + memmove(buf, rx.data, rx.count); + if(offset == -1){ + qlock(&fid->lk); + tx.offset += n; + qunlock(&fid->lk); + } + } + free(freep); + + return rx.count; +} + +long +fsread(Fid *fid, void *buf, long n) +{ + return fspread(fid, buf, n, -1); +} |