commit e52319cc7d153e4f59b38c4fb4c0556e118d4775
parent 21e0d6e8b8d20903494386e7e6f43201b3761154
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date: Fri, 10 Apr 2020 22:25:46 +0200
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.
Diffstat:
| M | st.c | | | 25 | ++++++++++++++++--------- |
1 file changed, 16 insertions(+), 9 deletions(-)
diff --git a/st.c b/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
