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tail: fix follow for empty files (thanks cinap_lenrek)

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This commit is contained in:
ftrvxmtrx 2014-05-08 14:29:44 +02:00
parent 1c835e370f
commit 7ea0732c55
1 changed files with 4 additions and 2 deletions
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6
sys/src/cmd/tail.c
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@ -8,6 +8,7 @@
* the simple command tail -c, legal in v10, is illegal
*/
vlong fend;
long count;
int anycount;
int follow;
@ -111,7 +112,7 @@ main(int argc, char **argv)
else
if(units==LINES && origin==BEG)
skip();
if(follow && seekable)
if(follow && (seekable || fend == 0))
for(;;) {
static Dir *sb0, *sb1;
trunc(sb1, &sb0);
@ -368,5 +369,6 @@ usage(void)
static int
isseekable(int fd)
{
return seek(fd, 0, 2) > 0 && seek(fd, 0, 0) == 0;
fend = seek(fd, 0, 2);
return fend > 0 && seek(fd, 0, 0) == 0;
}