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-rw-r--r--gdb/event-loop.c117
1 files changed, 54 insertions, 63 deletions
diff --git a/gdb/event-loop.c b/gdb/event-loop.c
index d6babc2..223baf7 100644
--- a/gdb/event-loop.c
+++ b/gdb/event-loop.c
@@ -27,6 +27,7 @@
#include <poll.h>
#else
#include <sys/types.h>
+#include <string.h>
#endif
#include <errno.h>
#include <setjmp.h>
@@ -34,9 +35,14 @@
/* Type of the mask arguments to select. */
-#ifndef NO_FD_SET
-#define SELECT_MASK fd_set
-#else
+#ifndef HAVE_POLL
+#ifdef NO_FD_SET
+/* All this stuff below is not required if select is used as God(tm)
+ intended, with the FD_* macros. Are there any implementations of
+ select which don't have FD_SET and other standard FD_* macros? I
+ don't think there are, but if I'm wrong, we need to catch them. */
+#error FD_SET must be defined if select function is to be used!
+
#ifndef _AIX
typedef long fd_mask;
#endif
@@ -44,8 +50,7 @@ typedef long fd_mask;
#define SELECT_MASK void
#else
#define SELECT_MASK int
-#endif
-#endif
+#endif /* !_IBMR2 */
/* Define "NBBY" (number of bits per byte) if it's not already defined. */
@@ -53,7 +58,6 @@ typedef long fd_mask;
#define NBBY 8
#endif
-
/* Define the number of fd_masks in an fd_set */
#ifndef FD_SETSIZE
@@ -71,6 +75,9 @@ typedef long fd_mask;
#endif
#define MASK_SIZE howmany(FD_SETSIZE, NFDBITS)
+#endif /* NO_FD_SET */
+#endif /* !HAVE_POLL */
+
typedef struct gdb_event gdb_event;
typedef void (event_handler_func) (int);
@@ -192,10 +199,10 @@ static struct
/* Masks to be used in the next call to select.
Bits are set in response to calls to create_file_handler. */
- fd_mask check_masks[3 * MASK_SIZE];
+ fd_set check_masks[3];
/* What file descriptors were found ready by select. */
- fd_mask ready_masks[3 * MASK_SIZE];
+ fd_set ready_masks[3];
/* Number of valid bits (highest fd value + 1). */
int num_fds;
@@ -487,10 +494,6 @@ create_file_handler (int fd, int mask, handler_func * proc, gdb_client_data clie
{
file_handler *file_ptr;
-#ifndef HAVE_POLL
- int index, bit;
-#endif
-
/* Do we already have a file handler for this file? (We may be
changing its associated procedure). */
for (file_ptr = gdb_notifier.first_file_handler; file_ptr != NULL;
@@ -532,23 +535,20 @@ create_file_handler (int fd, int mask, handler_func * proc, gdb_client_data clie
#else /* ! HAVE_POLL */
- index = fd / (NBBY * sizeof (fd_mask));
- bit = 1 << (fd % (NBBY * sizeof (fd_mask)));
-
if (mask & GDB_READABLE)
- gdb_notifier.check_masks[index] |= bit;
+ FD_SET (fd, &gdb_notifier.check_masks[0]);
else
- gdb_notifier.check_masks[index] &= ~bit;
+ FD_CLR (fd, &gdb_notifier.check_masks[0]);
if (mask & GDB_WRITABLE)
- (gdb_notifier.check_masks + MASK_SIZE)[index] |= bit;
+ FD_SET (fd, &gdb_notifier.check_masks[1]);
else
- (gdb_notifier.check_masks + MASK_SIZE)[index] &= ~bit;
+ FD_CLR (fd, &gdb_notifier.check_masks[1]);
if (mask & GDB_EXCEPTION)
- (gdb_notifier.check_masks + 2 * (MASK_SIZE))[index] |= bit;
+ FD_SET (fd, &gdb_notifier.check_masks[2]);
else
- (gdb_notifier.check_masks + 2 * (MASK_SIZE))[index] &= ~bit;
+ FD_CLR (fd, &gdb_notifier.check_masks[2]);
if (gdb_notifier.num_fds <= fd)
gdb_notifier.num_fds = fd + 1;
@@ -562,11 +562,10 @@ void
delete_file_handler (int fd)
{
file_handler *file_ptr, *prev_ptr = NULL;
- int i, j;
+ int i;
+#ifdef HAVE_POLL
+ int j;
struct pollfd *new_poll_fds;
-#ifndef HAVE_POLL
- int index, bit;
- unsigned long flags;
#endif
/* Find the entry for the given file. */
@@ -604,36 +603,26 @@ delete_file_handler (int fd)
#else /* ! HAVE_POLL */
- index = fd / (NBBY * sizeof (fd_mask));
- bit = 1 << (fd % (NBBY * sizeof (fd_mask)));
-
if (file_ptr->mask & GDB_READABLE)
- gdb_notifier.check_masks[index] &= ~bit;
+ FD_CLR (fd, &gdb_notifier.check_masks[0]);
if (file_ptr->mask & GDB_WRITABLE)
- (gdb_notifier.check_masks + MASK_SIZE)[index] &= ~bit;
+ FD_CLR (fd, &gdb_notifier.check_masks[1]);
if (file_ptr->mask & GDB_EXCEPTION)
- (gdb_notifier.check_masks + 2 * (MASK_SIZE))[index] &= ~bit;
+ FD_CLR (fd, &gdb_notifier.check_masks[2]);
/* Find current max fd. */
if ((fd + 1) == gdb_notifier.num_fds)
{
- for (gdb_notifier.num_fds = 0; index >= 0; index--)
+ gdb_notifier.num_fds--;
+ for (i = gdb_notifier.num_fds; i; i--)
{
- flags = gdb_notifier.check_masks[index]
- | (gdb_notifier.check_masks + MASK_SIZE)[index]
- | (gdb_notifier.check_masks + 2 * (MASK_SIZE))[index];
- if (flags)
- {
- for (i = (NBBY * sizeof (fd_mask)); i > 0; i--)
- {
- if (flags & (((unsigned long) 1) << (i - 1)))
- break;
- }
- gdb_notifier.num_fds = index * (NBBY * sizeof (fd_mask)) + i;
- break;
- }
+ if (FD_ISSET (i - 1, &gdb_notifier.check_masks[0])
+ || FD_ISSET (i - 1, &gdb_notifier.check_masks[1])
+ || FD_ISSET (i - 1, &gdb_notifier.check_masks[2]))
+ break;
}
+ gdb_notifier.num_fds = i;
}
#endif /* HAVE_POLL */
@@ -742,10 +731,8 @@ gdb_wait_for_event (void)
file_handler *file_ptr;
gdb_event *file_event_ptr;
int num_found = 0;
+#ifdef HAVE_POLL
int i;
-
-#ifndef HAVE_POLL
- int mask, bit, index;
#endif
/* Make sure all output is done before getting another event. */
@@ -767,20 +754,24 @@ gdb_wait_for_event (void)
perror_with_name ("Poll");
#else /* ! HAVE_POLL */
- memcpy (gdb_notifier.ready_masks,
- gdb_notifier.check_masks,
- 3 * MASK_SIZE * sizeof (fd_mask));
+
+ gdb_notifier.ready_masks[0] = gdb_notifier.check_masks[0];
+ gdb_notifier.ready_masks[1] = gdb_notifier.check_masks[1];
+ gdb_notifier.ready_masks[2] = gdb_notifier.check_masks[2];
+
num_found = select (gdb_notifier.num_fds,
- (SELECT_MASK *) & gdb_notifier.ready_masks[0],
- (SELECT_MASK *) & gdb_notifier.ready_masks[MASK_SIZE],
- (SELECT_MASK *) & gdb_notifier.ready_masks[2 * MASK_SIZE],
- gdb_notifier.timeout_valid ? &gdb_notifier.timeout : NULL);
+ & gdb_notifier.ready_masks[0],
+ & gdb_notifier.ready_masks[1],
+ & gdb_notifier.ready_masks[2],
+ gdb_notifier.timeout_valid
+ ? &gdb_notifier.timeout : NULL);
/* Clear the masks after an error from select. */
if (num_found == -1)
{
- memset (gdb_notifier.ready_masks,
- 0, 3 * MASK_SIZE * sizeof (fd_mask));
+ FD_ZERO (&gdb_notifier.ready_masks[0]);
+ FD_ZERO (&gdb_notifier.ready_masks[1]);
+ FD_ZERO (&gdb_notifier.ready_masks[2]);
/* Dont print anything is we got a signal, let gdb handle it. */
if (errno != EINTR)
perror_with_name ("Select");
@@ -821,19 +812,18 @@ gdb_wait_for_event (void)
}
#else /* ! HAVE_POLL */
+
for (file_ptr = gdb_notifier.first_file_handler;
(file_ptr != NULL) && (num_found > 0);
file_ptr = file_ptr->next_file)
{
- index = file_ptr->fd / (NBBY * sizeof (fd_mask));
- bit = 1 << (file_ptr->fd % (NBBY * sizeof (fd_mask)));
- mask = 0;
+ int mask = 0;
- if (gdb_notifier.ready_masks[index] & bit)
+ if (FD_ISSET (file_ptr->fd, &gdb_notifier.ready_masks[0]))
mask |= GDB_READABLE;
- if ((gdb_notifier.ready_masks + MASK_SIZE)[index] & bit)
+ if (FD_ISSET (file_ptr->fd, &gdb_notifier.ready_masks[1]))
mask |= GDB_WRITABLE;
- if ((gdb_notifier.ready_masks + 2 * (MASK_SIZE))[index] & bit)
+ if (FD_ISSET (file_ptr->fd, &gdb_notifier.ready_masks[2]))
mask |= GDB_EXCEPTION;
if (!mask)
@@ -851,6 +841,7 @@ gdb_wait_for_event (void)
}
file_ptr->ready_mask = mask;
}
+
#endif /* HAVE_POLL */
return 0;
generated by cgit v1.1 at 2024-12-02 12:55:37 +0000