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kernel: devdup: fix dup(n, 0)

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A successful dup(n, 0) must not return -1L
This commit is contained in:
Giacomo Tesio
2017-01-17 21:48:30 +01:00
parent 207967f9e8
commit e1a14b49be
1 changed files with 7 additions and 3 deletions
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8
sys/src/kern/port/devdup.c
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@ -64,13 +64,17 @@ static Chan*
dupcreate(Chan* c, char* name, unsigned long omode, unsigned long perm) dupcreate(Chan* c, char* name, unsigned long omode, unsigned long perm)
{ {
FdPair in, out; FdPair in, out;
int d;
if((omode|OCEXEC) == ~0 && c->qid.path == 0){ if((omode|OCEXEC) == ~0 && c->qid.path == 0){
in.aslong = perm; in.aslong = perm;
out.aslong = 0; out.aslong = ~0;
out.fd[1] = sysdup(in.fd[0], in.fd[1]); d = sysdup(in.fd[0], in.fd[1]);
if(d >= 0){
out.fd[1] = d;
errorl(nil, ~out.aslong); errorl(nil, ~out.aslong);
} }
}
error(Eperm); error(Eperm);
} }