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ttyread: test for EOF while reading tty

When a read operation returns 0 then it means that we arrived to the end of the
file, and new reads will return 0 unless you do some other operation such as
lseek(). This case happens with USB-232 adapters when they are unplugged.
master
Roberto E. Vargas Caballero 1 year ago
committed by Hiltjo Posthuma
parent
commit
e52319cc7d
  1. 25
      st.c

25
st.c

@ -823,17 +823,24 @@ ttyread(void)
int ret;
/* append read bytes to unprocessed bytes */
if ((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
die("couldn't read from shell: %s\n", strerror(errno));
buflen += ret;
ret = read(cmdfd, buf+buflen, LEN(buf)-buflen);
written = twrite(buf, buflen, 0);
buflen -= written;
/* keep any uncomplete utf8 char for the next call */
if (buflen > 0)
memmove(buf, buf + written, buflen);
switch (ret) {
case 0:
fputs("Found EOF in input\n", stderr);
exit(0);
case -1:
die("couldn't read from shell: %s\n", strerror(errno));
default:
buflen += ret;
written = twrite(buf, buflen, 0);
buflen -= written;
/* keep any uncomplete utf8 char for the next call */
if (buflen > 0)
memmove(buf, buf + written, buflen);
return ret;
return ret;
}
}
void

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