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select_tut.2: Simplify 'if' logic in in example program 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2016-02-03 14:36:49 +01:00
parent 894d620ae2
commit 65842010f3
1 changed files with 48 additions and 54 deletions
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102
man2/select_tut.2
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@ -730,62 +730,56 @@ main(int argc, char *argv[])
/* NB: read OOB data before normal reads */
if (fd1 > 0)
if (FD_ISSET(fd1, &exceptfds)) {
char c;
if (fd1 > 0 && FD_ISSET(fd1, &exceptfds)) {
char c;
nbytes = recv(fd1, &c, 1, MSG_OOB);
if (nbytes < 1)
SHUT_FD1;
else
send(fd2, &c, 1, MSG_OOB);
}
if (fd2 > 0)
if (FD_ISSET(fd2, &exceptfds)) {
char c;
nbytes = recv(fd1, &c, 1, MSG_OOB);
if (nbytes < 1)
SHUT_FD1;
else
send(fd2, &c, 1, MSG_OOB);
}
if (fd2 > 0 && FD_ISSET(fd2, &exceptfds)) {
char c;
nbytes = recv(fd2, &c, 1, MSG_OOB);
if (nbytes < 1)
SHUT_FD2;
else
send(fd1, &c, 1, MSG_OOB);
}
if (fd1 > 0)
if (FD_ISSET(fd1, &readfds)) {
nbytes = read(fd1, buf1 + buf1_avail,
BUF_SIZE \- buf1_avail);
if (nbytes < 1)
SHUT_FD1;
else
buf1_avail += nbytes;
}
if (fd2 > 0)
if (FD_ISSET(fd2, &readfds)) {
nbytes = read(fd2, buf2 + buf2_avail,
BUF_SIZE \- buf2_avail);
if (nbytes < 1)
SHUT_FD2;
else
buf2_avail += nbytes;
}
if (fd1 > 0)
if (FD_ISSET(fd1, &writefds)) {
nbytes = write(fd1, buf2 + buf2_written,
buf2_avail \- buf2_written);
if (nbytes < 1)
SHUT_FD1;
else
buf2_written += nbytes;
}
if (fd2 > 0)
if (FD_ISSET(fd2, &writefds)) {
nbytes = write(fd2, buf1 + buf1_written,
buf1_avail \- buf1_written);
if (nbytes < 1)
SHUT_FD2;
else
buf1_written += nbytes;
}
nbytes = recv(fd2, &c, 1, MSG_OOB);
if (nbytes < 1)
SHUT_FD2;
else
send(fd1, &c, 1, MSG_OOB);
}
if (fd1 > 0 && FD_ISSET(fd1, &readfds)) {
nbytes = read(fd1, buf1 + buf1_avail,
BUF_SIZE \- buf1_avail);
if (nbytes < 1)
SHUT_FD1;
else
buf1_avail += nbytes;
}
if (fd2 > 0 && FD_ISSET(fd2, &readfds)) {
nbytes = read(fd2, buf2 + buf2_avail,
BUF_SIZE \- buf2_avail);
if (nbytes < 1)
SHUT_FD2;
else
buf2_avail += nbytes;
}
if (fd1 > 0 && FD_ISSET(fd1, &writefds)) {
nbytes = write(fd1, buf2 + buf2_written,
buf2_avail \- buf2_written);
if (nbytes < 1)
SHUT_FD1;
else
buf2_written += nbytes;
}
if (fd2 > 0 && FD_ISSET(fd2, &writefds)) {
nbytes = write(fd2, buf1 + buf1_written,
buf1_avail \- buf1_written);
if (nbytes < 1)
SHUT_FD2;
else
buf1_written += nbytes;
}
/* Check if write data has caught read data */