tlib9: add write function that withstands interrupts - plan9port - [fork] Plan 9 from user space
HTML git clone git://src.adamsgaard.dk/plan9port
DIR Log
DIR Files
DIR Refs
DIR README
DIR LICENSE
---
DIR commit cab935a0ba34797d8b75fe1cfb7624a33d25e671
DIR parent fc9fc9c83154ff0fa5a56854ee1f023c78f66fd8
HTML Author: Russ Cox <rsc@swtch.com>
Date: Fri, 4 Jul 2008 12:38:26 -0400
lib9: add write function that withstands interrupts
Diffstat:
M include/libc.h | 2 ++
M src/lib9/mkfile | 1 +
A src/lib9/write.c | 23 +++++++++++++++++++++++
3 files changed, 26 insertions(+), 0 deletions(-)
---
DIR diff --git a/include/libc.h b/include/libc.h
t@@ -793,6 +793,7 @@ extern int p9waitpid(void);
extern long write(int, void*, long);
extern long writev(int, IOchunk*, int);
*/
+extern long p9write(int, void*, long);
/* extern int wstat(char*, uchar*, int); give up */
extern ulong rendezvous(ulong, ulong);
t@@ -813,6 +814,7 @@ extern ulong rendezvous(ulong, ulong);
#define open p9open
#define pipe p9pipe
#define waitfor p9waitfor
+#define write p9write
#endif
extern Dir* dirstat(char*);
DIR diff --git a/src/lib9/mkfile b/src/lib9/mkfile
t@@ -157,6 +157,7 @@ LIB9OFILES=\
unsharp.$O\
wait.$O\
waitpid.$O\
+ write.$O\
OFILES=\
$LIB9OFILES\
DIR diff --git a/src/lib9/write.c b/src/lib9/write.c
t@@ -0,0 +1,23 @@
+#include <u.h>
+#define NOPLAN9DEFINES
+#include <libc.h>
+
+long
+p9write(int f, void *av, long n)
+{
+ char *a;
+ long m, t;
+
+ a = av;
+ t = 0;
+ while(t < n){
+ m = write(f, a+t, n-t);
+ if(m <= 0){
+ if(t == 0)
+ return m;
+ break;
+ }
+ t += m;
+ }
+ return t;
+}