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tee: syscall return values #39

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tee: syscall return values #39

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7 changes: 3 additions & 4 deletions usr.bin/tee/tee.c
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Original file line number Diff line number Diff line change
Expand Up @@ -84,7 +84,6 @@ main(int argc, char *argv[])
case 'i':
(void)signal(SIGINT, SIG_IGN);
break;
case '?':
default:
(void)fprintf(stderr, "usage: tee [-ai] [file ...]\n");
exit(1);
Expand All @@ -99,13 +98,13 @@ main(int argc, char *argv[])

for (exitval = 0; *argv; ++argv)
if ((fd = open(*argv, append ? O_WRONLY|O_CREAT|O_APPEND :
O_WRONLY|O_CREAT|O_TRUNC, DEFFILEMODE)) < 0) {
O_WRONLY|O_CREAT|O_TRUNC, DEFFILEMODE)) == -1) {
warn("%s", *argv);
exitval = 1;
} else
add(fd, *argv);

while ((rval = read(STDIN_FILENO, buf, BSIZE)) > 0)
while ((rval = read(STDIN_FILENO, buf, BSIZE)) != 0 && rval != -1)
for (p = head; p; p = p->next) {
const char *bp = buf;
size_t n = rval;
Expand All @@ -120,7 +119,7 @@ main(int argc, char *argv[])
bp += wval;
} while (n -= wval);
}
if (rval < 0) {
if (rval == -1) {
warn("read");
exitval = 1;
}
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