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implement fdreadn

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This commit is contained in:
David du Colombier 2014-08-03 18:51:25 +02:00
parent 0d454584f8
commit 02b74edba1
3 changed files with 22 additions and 0 deletions
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5
README
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@ -98,6 +98,11 @@ int fdread(int, void*, int);
Like regular read(), but puts task to sleep while waiting for
data instead of blocking the whole program.
int fdreadn(int, void*, int);
Like fdread(), but does successive read calls until n bytes have
been read, or a read system call returns a non-positive count.
int fdwrite(int, void*, int);
Like regular write(), but puts task to sleep while waiting to

16
fd.c
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@ -290,6 +290,22 @@ fdread(int fd, void *buf, int n)
return m;
}
int
fdreadn(int fd, void *buf, int n)
{
int m, tot;
for(tot=0; tot<n; tot+=m){
m = fdread(fd, (char*)buf+tot, n-tot);
if(m < 0)
return m;
if(m == 0)
break;
}
return tot;
}
int
fdwrite(int fd, void *buf, int n)
{

1
task.h
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@ -154,6 +154,7 @@ int chansendul(Channel *c, unsigned long v);
*/
int fdread(int, void*, int);
int fdread1(int, void*, int); /* always uses fdwait */
int fdreadn(int, void*, int);
int fdwrite(int, void*, int);
void fdwait(int, int);
int fdnoblock(int);