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Check result of write (thans to Alexander Kapshuk <alexander.kapshuk@gmail)

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This commit is contained in:
Frans Kaashoek 2016-09-19 07:01:30 -04:00
parent 912575ad12
commit 89826f41bd
1 changed files with 6 additions and 2 deletions
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8
cat.c
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@ -9,8 +9,12 @@ cat(int fd)
{
int n;
while((n = read(fd, buf, sizeof(buf))) > 0)
write(1, buf, n);
while((n = read(fd, buf, sizeof(buf))) > 0) {
if (write(1, buf, n) != n) {
printf(1, "cat: write error\n");
exit();
}
}
if(n < 0){
printf(1, "cat: read error\n");
exit();