diff options
Diffstat (limited to 'cpukit/libcsupport/src/libio.c')
| -rw-r--r-- | cpukit/libcsupport/src/libio.c | 157 |
1 files changed, 96 insertions, 61 deletions
diff --git a/cpukit/libcsupport/src/libio.c b/cpukit/libcsupport/src/libio.c index e63a4626d4..88aea9b62f 100644 --- a/cpukit/libcsupport/src/libio.c +++ b/cpukit/libcsupport/src/libio.c @@ -3,9 +3,6 @@ * table of integer style file descriptors used by the low level * POSIX system calls like open(), read, fstat(), etc. * - * This provides the foundation for POSIX compliant IO system calls - * for RTEMS. - * * COPYRIGHT (c) 1989-1998. * On-Line Applications Research Corporation (OAR). * Copyright assigned to U.S. Government, 1994. @@ -18,18 +15,56 @@ */ #include "libio_.h" /* libio_.h pulls in rtems */ +#include <rtems.h> +#include <rtems/assoc.h> /* assoc.h not included by rtems.h */ + +#include <stdio.h> /* O_RDONLY, et.al. */ +#include <fcntl.h> /* O_RDONLY, et.al. */ +#include <assert.h> +#include <errno.h> + +#if ! defined(O_NDELAY) +# if defined(solaris2) +# define O_NDELAY O_NONBLOCK +# elif defined(RTEMS_NEWLIB) +# define O_NDELAY _FNBIO +# endif +#endif + + +#include <errno.h> +#include <string.h> /* strcmp */ +#include <unistd.h> +#include <stdlib.h> /* calloc() */ + +#include "libio.h" /* libio.h not pulled in by rtems */ + +/* + * File descriptor Table Information + */ + +extern unsigned32 rtems_libio_number_iops; +rtems_id rtems_libio_semaphore; +rtems_libio_t *rtems_libio_iops; +rtems_libio_t *rtems_libio_last_iop; +rtems_libio_t *rtems_libio_iop_freelist; /* - * Global variables used to manage the File Descriptor Table. - * IOP = IO Pointer. + * External I/O Handlers Table + * + * Space for all possible handlers is preallocated + * to speed up dispatch to external handlers. */ -rtems_id rtems_libio_semaphore; -rtems_libio_t *rtems_libio_iops; -rtems_libio_t *rtems_libio_last_iop; rtems_libio_handler_t rtems_libio_handlers[15]; /* + * Default mode for all files. + */ + +mode_t rtems_filesystem_umask; + +/* * rtems_register_libio_handler * * This function registers an external IO handler set. This lets @@ -44,8 +79,7 @@ void rtems_register_libio_handler( const rtems_libio_handler_t *handler ) { - int handler_index = rtems_file_descriptor_type_index( handler_flag ); - + int handler_index = (handler_flag >> LIBIO_FLAGS_HANDLER_SHIFT) - 1; if ((handler_index < 0) || (handler_index >= 15)) rtems_fatal_error_occurred( RTEMS_INVALID_NUMBER ); @@ -61,21 +95,22 @@ void rtems_register_libio_handler( void rtems_libio_init( void ) { - rtems_status_code rc; - - /* - * Allocate memory for the IOP Table - */ - - if ( rtems_libio_number_iops > 0 ) { - rtems_libio_iops = - (rtems_libio_t *) calloc(rtems_libio_number_iops, sizeof(rtems_libio_t)); - - if (rtems_libio_iops == NULL) - rtems_fatal_error_occurred( RTEMS_NO_MEMORY ); - - rtems_libio_last_iop = rtems_libio_iops + (rtems_libio_number_iops - 1); - } + rtems_status_code rc; + int i; + rtems_libio_t *iop; + + if (rtems_libio_number_iops > 0) + { + rtems_libio_iops = (rtems_libio_t *) calloc(rtems_libio_number_iops, + sizeof(rtems_libio_t)); + if (rtems_libio_iops == NULL) + rtems_fatal_error_occurred(RTEMS_NO_MEMORY); + + iop = rtems_libio_iop_freelist = rtems_libio_iops; + for (i = 0 ; i < (rtems_libio_number_iops - 1) ; i++, iop++) + iop->data1 = iop + 1; + iop->data1 = NULL; + } /* * Create the binary semaphore used to provide mutual exclusion @@ -157,24 +192,21 @@ rtems_libio_t *rtems_libio_allocate( void ) rtems_semaphore_obtain( rtems_libio_semaphore, RTEMS_WAIT, RTEMS_NO_TIMEOUT ); - for (iop = rtems_libio_iops; iop <= rtems_libio_last_iop; iop++) - if ((iop->flags & LIBIO_FLAGS_OPEN) == 0) { - /* - * Got an IOP -- create a semaphore for it. - */ - - rc = rtems_semaphore_create( - RTEMS_LIBIO_IOP_SEM(iop - rtems_libio_iops), - 1, - RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, - RTEMS_NO_PRIORITY, - &iop->sem - ); - if ( rc != RTEMS_SUCCESSFUL ) - goto failed; - - iop->flags = LIBIO_FLAGS_OPEN; - goto done; + if (rtems_libio_iop_freelist) { + iop = rtems_libio_iop_freelist; + rc = rtems_semaphore_create( + RTEMS_LIBIO_IOP_SEM(iop - rtems_libio_iops), + 1, + RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, + RTEMS_NO_PRIORITY, + &iop->sem + ); + if (rc != RTEMS_SUCCESSFUL) + goto failed; + rtems_libio_iop_freelist = iop->data1; + iop->data1 = 0; + iop->flags = LIBIO_FLAGS_OPEN; + goto done; } failed: @@ -198,19 +230,20 @@ void rtems_libio_free( { rtems_semaphore_obtain( rtems_libio_semaphore, RTEMS_WAIT, RTEMS_NO_TIMEOUT ); - if (iop->sem) - rtems_semaphore_delete(iop->sem); + if (iop->sem) + rtems_semaphore_delete(iop->sem); - (void) memset(iop, 0, sizeof(*iop)); + iop->data1 = rtems_libio_iop_freelist; + rtems_libio_iop_freelist = iop; - rtems_semaphore_release( rtems_libio_semaphore ); + rtems_semaphore_release(rtems_libio_semaphore); } /* * rtems_libio_is_open_files_in_fs * * This routine scans the entire file descriptor table to determine if the - * are any active file descriptors that refer to the atleast one node in the + * are any active file descriptors that refer to the at least one node in the * file system that we are trying to dismount. * * If there is at least one node in the file system referenced by the mount @@ -225,19 +258,19 @@ int rtems_libio_is_open_files_in_fs( int result = 0; rtems_semaphore_obtain( rtems_libio_semaphore, RTEMS_WAIT, RTEMS_NO_TIMEOUT ); - + /* * Look for any active file descriptor entry. - */ - + */ + for ( iop=rtems_libio_iops ; iop <= rtems_libio_last_iop ; iop++ ) { - + if ((iop->flags & LIBIO_FLAGS_OPEN) != 0) { - + /* * Check if this node is under the file system that we * are trying to dismount. - */ + */ if ( iop->pathinfo.mt_entry == fs_mt_entry ) { result = 1; @@ -247,7 +280,7 @@ int rtems_libio_is_open_files_in_fs( } rtems_semaphore_release( rtems_libio_semaphore ); - + return result; } @@ -256,7 +289,7 @@ int rtems_libio_is_open_files_in_fs( * * This routine scans the entire file descriptor table to determine if the * given file refers to an active file descriptor. - * + * * If the given file is open a 1 is returned, otherwise a 0 is returned. */ @@ -265,22 +298,22 @@ int rtems_libio_is_file_open( ) { rtems_libio_t *iop; - int result=0; + int result=0; rtems_semaphore_obtain( rtems_libio_semaphore, RTEMS_WAIT, RTEMS_NO_TIMEOUT ); /* * Look for any active file descriptor entry. */ - + for ( iop=rtems_libio_iops ; iop <= rtems_libio_last_iop ; iop++ ) { - + if ((iop->flags & LIBIO_FLAGS_OPEN) != 0) { - + /* * Check if this node is under the file system that we * are trying to dismount. - */ + */ if ( iop->pathinfo.node_access == node_access ) { result = 1; @@ -293,3 +326,5 @@ int rtems_libio_is_file_open( return result; } + + |