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vi: don't wait 50 ms before reading ESC sequences
inetd,syslogd: use safe_read instead of open-coded EINTR handling syslogd: bail out if you see null read from Unix socket (should never happen, but if it does, spinning forever and eating 100% CPU is not a good idea)
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19
editors/vi.c
19
editors/vi.c
@ -2152,7 +2152,7 @@ static char readit(void) // read (maybe cursor) key from stdin
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char c;
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int n;
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struct esc_cmds {
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const char *seq;
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const char seq[4];
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char val;
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};
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@ -2178,6 +2178,7 @@ static char readit(void) // read (maybe cursor) key from stdin
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{"OQ", VI_K_FUN2}, // Function Key F2
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{"OR", VI_K_FUN3}, // Function Key F3
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{"OS", VI_K_FUN4}, // Function Key F4
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// careful: these have no terminating NUL!
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{"[15~", VI_K_FUN5}, // Function Key F5
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{"[17~", VI_K_FUN6}, // Function Key F6
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{"[18~", VI_K_FUN7}, // Function Key F7
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@ -2198,12 +2199,9 @@ static char readit(void) // read (maybe cursor) key from stdin
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n = readed_for_parse;
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// get input from User- are there already input chars in Q?
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if (n <= 0) {
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ri0:
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// the Q is empty, wait for a typed char
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n = read(0, readbuffer, MAX_LINELEN - 1);
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n = safe_read(0, readbuffer, MAX_LINELEN - 1);
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if (n < 0) {
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if (errno == EINTR)
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goto ri0; // interrupted sys call
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if (errno == EBADF || errno == EFAULT || errno == EINVAL
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|| errno == EIO)
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editing = 0;
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@ -2219,11 +2217,10 @@ static char readit(void) // read (maybe cursor) key from stdin
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struct pollfd pfd[1];
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pfd[0].fd = 0;
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pfd[0].events = POLLIN;
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// Wait 50 ms
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// keep reading while there are input chars and room in buffer
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while (safe_poll(pfd, 1, 50) > 0 && n <= (MAX_LINELEN - 5)) {
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while (safe_poll(pfd, 1, 0) > 0 && n <= (MAX_LINELEN - 5)) {
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// read the rest of the ESC string
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int r = read(0, readbuffer + n, MAX_LINELEN - n);
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int r = safe_read(0, readbuffer + n, MAX_LINELEN - n);
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if (r > 0)
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n += r;
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}
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@ -2236,7 +2233,7 @@ static char readit(void) // read (maybe cursor) key from stdin
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const struct esc_cmds *eindex;
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for (eindex = esccmds; eindex < &esccmds[ESCCMDS_COUNT]; eindex++) {
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int cnt = strlen(eindex->seq);
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int cnt = strnlen(eindex->seq, 4);
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if (n <= cnt)
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continue;
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@ -2397,7 +2394,7 @@ static int file_insert(const char * fn, char *p
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p = text_hole_make(p, size);
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if (p == NULL)
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goto fi0;
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cnt = read(fd, p, size);
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cnt = safe_read(fd, p, size);
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if (cnt < 0) {
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psbs("\"%s\" %s", fn, strerror(errno));
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p = text_hole_delete(p, p + size - 1); // un-do buffer insert
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@ -3961,7 +3958,7 @@ static void crash_test()
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printf("\n\n%d: \'%c\' %s\n\n\n%s[Hit return to continue]%s",
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totalcmds, last_input_char, msg, SOs, SOn);
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fflush(stdout);
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while (read(0, d, 1) > 0) {
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while (safe_read(0, d, 1) > 0) {
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if (d[0] == '\n' || d[0] == '\r')
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break;
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}
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@ -1638,8 +1638,7 @@ discard_stream(int s, servtab_t *sep)
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inetd_setproctitle(sep->se_service, s);
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while (1) {
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errno = 0;
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if (read(s, buffer, sizeof(buffer)) <= 0 && errno != EINTR)
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if (safe_read(s, buffer, sizeof(buffer)) <= 0)
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exit(0);
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}
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}
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@ -527,12 +527,10 @@ static void do_syslogd(void)
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for (;;) {
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size_t sz;
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sz = read(sock_fd, G.recvbuf, MAX_READ - 1);
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sz = safe_read(sock_fd, G.recvbuf, MAX_READ - 1);
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if (sz <= 0) {
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if (sz == 0)
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continue; /* EOF from unix socket??? */
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if (errno == EINTR) /* alarm may have happened */
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continue;
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//if (sz == 0)
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// continue; /* EOF from unix socket??? */
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bb_perror_msg_and_die("read from /dev/log");
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}
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