Bug Summary

File:/home/joel/rtems-4.11-work/build/rtems/c/src/../../cpukit/posix/src/semopen.c
Location:line 64, column 5
Description:Value stored to 'mode' is never read

Annotated Source Code

1/*
2 * COPYRIGHT (c) 1989-2007.
3 * On-Line Applications Research Corporation (OAR).
4 *
5 * The license and distribution terms for this file may be
6 * found in the file LICENSE in this distribution or at
7 * http://www.rtems.com/license/LICENSE.
8 *
9 * $Id: semopen.c,v 1.15 2009/05/03 23:10:02 joel Exp $
10 */
11
12#if HAVE_CONFIG_H1
13#include "config.h"
14#endif
15
16#include <stdarg.h>
17
18#include <errno(*__errno_location ()).h>
19#include <fcntl.h>
20#include <pthread.h>
21#include <semaphore.h>
22#include <limits.h>
23
24#include <rtems/system.h>
25#include <rtems/score/object.h>
26#include <rtems/posix/semaphore.h>
27#include <rtems/posix/time.h>
28#include <rtems/seterr.h>
29
30/*PAGE
31 *
32 * sem_open
33 *
34 * Opens a named semaphore. Used in conjunction with the sem_close
35 * and sem_unlink commands.
36 *
37 * 11.2.3 Initialize/Open a Named Semaphore, P1003.1b-1993, p.221
38 *
39 * NOTE: When oflag is O_CREAT, then optional third and fourth
40 * parameters must be present.
41 */
42
43sem_t *sem_open(
44 const char *name,
45 int oflag,
46 ...
47 /* mode_t mode, */
48 /* unsigned int value */
49)
50{
51 va_list arg;
52 mode_t mode;
53 unsigned int value = 0;
54 int status;
55 sem_t the_semaphore_id;
56 sem_t *id;
57 POSIX_Semaphore_Control *the_semaphore;
58 Objects_Locations location;
59
60 _Thread_Disable_dispatch();
61
62 if ( oflag & O_CREAT0100 ) {
63 va_start(arg, oflag)__builtin_va_start(arg, oflag);
64 mode = (mode_t) va_arg( arg, unsigned int )__builtin_va_arg(arg, unsigned int);
Value stored to 'mode' is never read
65 value = va_arg( arg, unsigned int )__builtin_va_arg(arg, unsigned int);
66 va_end(arg)__builtin_va_end(arg);
67 }
68
69 status = _POSIX_Semaphore_Name_to_id( name, &the_semaphore_id );
70
71 /*
72 * If the name to id translation worked, then the semaphore exists
73 * and we can just return a pointer to the id. Otherwise we may
74 * need to check to see if this is a "semaphore does not exist"
75 * or some other miscellaneous error on the name.
76 */
77
78 if ( status ) {
79
80 /*
81 * Unless provided a valid name that did not already exist
82 * and we are willing to create then it is an error.
83 */
84
85 if ( !( status == ENOENT2 && (oflag & O_CREAT0100) ) ) {
86 _Thread_Enable_dispatch();
87 rtems_set_errno_and_return_minus_one_cast( status, sem_t * )do { (*__errno_location ()) = (status); return (sem_t *) -1; }
while(0);
88 }
89 } else {
90
91 /*
92 * Check for existence with creation.
93 */
94
95 if ( (oflag & (O_CREAT0100 | O_EXCL0200)) == (O_CREAT0100 | O_EXCL0200) ) {
96 _Thread_Enable_dispatch();
97 rtems_set_errno_and_return_minus_one_cast( EEXIST, sem_t * )do { (*__errno_location ()) = (17); return (sem_t *) -1; } while
(0);
98 }
99
100 the_semaphore = _POSIX_Semaphore_Get( &the_semaphore_id, &location );
101 the_semaphore->open_count += 1;
102 _Thread_Enable_dispatch();
103 _Thread_Enable_dispatch();
104 goto return_id;
105 }
106
107 /*
108 * At this point, the semaphore does not exist and everything has been
109 * checked. We should go ahead and create a semaphore.
110 */
111
112 status =_POSIX_Semaphore_Create_support(
113 name,
114 false0, /* not shared across processes */
115 value,
116 &the_semaphore
117 );
118
119 /*
120 * errno was set by Create_support, so don't set it again.
121 */
122
123 _Thread_Enable_dispatch();
124
125 if ( status == -1 )
126 return SEM_FAILED(sem_t *) -1;
127
128return_id:
129 #if defined(RTEMS_USE_16_BIT_OBJECT)
130 the_semaphore->Semaphore_id = the_semaphore->Object.id;
131 id = &the_semaphore->Semaphore_id;
132 #else
133 id = (sem_t *)&the_semaphore->Object.id;
134 #endif
135 return id;
136}