diff options
| -rw-r--r-- | miscutils/less.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/miscutils/less.c b/miscutils/less.c index b0e2754..207f586 100644 --- a/miscutils/less.c +++ b/miscutils/less.c @@ -21,6 +21,8 @@ * redirected input has been read from stdin */ +#include <sched.h> /* sched_yield() */ + #include "busybox.h" #if ENABLE_FEATURE_LESS_REGEXP #include "xregex.h" @@ -200,16 +202,30 @@ static void read_lines(void) char c; /* if no unprocessed chars left, eat more */ if (readpos >= readeof) { + smallint yielded = 0; + ndelay_on(0); + read_again: eof_error = safe_read(0, readbuf, sizeof(readbuf)); - ndelay_off(0); readpos = 0; readeof = eof_error; if (eof_error < 0) { + if (errno == EAGAIN && !yielded) { + /* We can hit EAGAIN while searching for regexp match. + * Yield is not 100% reliable solution in general, + * but for less it should be good enough. + * We give stdin supplier some CPU time to produce more. + * We do it just once. */ + sched_yield(); + yielded = 1; + goto read_again; + } readeof = 0; if (errno != EAGAIN) print_statusline("read error"); } + ndelay_off(0); + if (eof_error <= 0) { goto reached_eof; } |