From 58a2c44a26e76806acee962f48bdc4863e97ac75 Mon Sep 17 00:00:00 2001 From: Elena Zannoni Date: Mon, 20 Mar 2000 19:59:38 +0000 Subject: [PATCH] 2000-03-04 Eli Zaretskii * event-loop.c (top-level) [NO_FD_SET]: Deprecate this branch. Print an error at compile time if we are to use select, but FD_SET is not available. (SELECT_MASK, NBBY, FD_SETSIZE, NFDBITS, MASK_SIZE): Define only if HAVE_POLL is not defined and NO_FD_SET *is* defined. (create_file_handler) [!HAVE_POLL]: Use FD_SET and FD_CLR. (delete_file_handler) [!HAVE_POLL]: Use FD_CLR and FD_ISSET. (gdb_wait_for_event) [!HAVE_POLL]: Copy fd_set sets directly instead of using memcpy and memset. Use FD_ISSET. * config/i386/xm-go32.h (fd_mask): Remove typedef. --- gdb/ChangeLog | 14 ++++++ gdb/config/i386/xm-go32.h | 1 - gdb/event-loop.c | 117 +++++++++++++++++++++------------------------- 3 files changed, 68 insertions(+), 64 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index f11915c..bd1b142 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,17 @@ +2000-03-04 Eli Zaretskii + + * event-loop.c (top-level) [NO_FD_SET]: Deprecate this branch. + Print an error at compile time if we are to use select, but FD_SET + is not available. + (SELECT_MASK, NBBY, FD_SETSIZE, NFDBITS, MASK_SIZE): Define only + if HAVE_POLL is not defined and NO_FD_SET *is* defined. + (create_file_handler) [!HAVE_POLL]: Use FD_SET and FD_CLR. + (delete_file_handler) [!HAVE_POLL]: Use FD_CLR and FD_ISSET. + (gdb_wait_for_event) [!HAVE_POLL]: Copy fd_set sets directly + instead of using memcpy and memset. Use FD_ISSET. + + * config/i386/xm-go32.h (fd_mask): Remove typedef. + Mon Mar 20 19:58:45 2000 Andrew Cagney * command.c (_initialize_command): Document requirements for ``!'' diff --git a/gdb/config/i386/xm-go32.h b/gdb/config/i386/xm-go32.h index 871b121..868074d 100644 --- a/gdb/config/i386/xm-go32.h +++ b/gdb/config/i386/xm-go32.h @@ -36,4 +36,3 @@ #define DIRNAME_SEPARATOR ';' #define HOST_I386 -typedef unsigned char fd_mask; 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 #else #include +#include #endif #include #include @@ -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; -- 2.7.4