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17<title>Debugging with GDB: struct stat</title>
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64<a name="struct-stat"></a>
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66<p>
67Next: <a href="struct-timeval.html#struct-timeval" accesskey="n" rel="next">struct timeval</a>, Previous: <a href="Memory-Transfer.html#Memory-Transfer" accesskey="p" rel="previous">Memory Transfer</a>, Up: <a href="Protocol_002dspecific-Representation-of-Datatypes.html#Protocol_002dspecific-Representation-of-Datatypes" accesskey="u" rel="up">Protocol-specific Representation of Datatypes</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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70<a name="struct-stat-1"></a>
71<h4 class="unnumberedsubsubsec">struct stat</h4>
72<a name="index-struct-stat_002c-in-file_002di_002fo-protocol"></a>
73
74<p>The buffer of type <code>struct stat</code> used by the target and <small>GDB</small>
75is defined as follows:
76</p>
77<div class="smallexample">
78<pre class="smallexample">struct stat {
79    unsigned int  st_dev;      /* device */
80    unsigned int  st_ino;      /* inode */
81    mode_t        st_mode;     /* protection */
82    unsigned int  st_nlink;    /* number of hard links */
83    unsigned int  st_uid;      /* user ID of owner */
84    unsigned int  st_gid;      /* group ID of owner */
85    unsigned int  st_rdev;     /* device type (if inode device) */
86    unsigned long st_size;     /* total size, in bytes */
87    unsigned long st_blksize;  /* blocksize for filesystem I/O */
88    unsigned long st_blocks;   /* number of blocks allocated */
89    time_t        st_atime;    /* time of last access */
90    time_t        st_mtime;    /* time of last modification */
91    time_t        st_ctime;    /* time of last change */
92};
93</pre></div>
94
95<p>The integral datatypes conform to the definitions given in the
96appropriate section (see <a href="Integral-Datatypes.html#Integral-Datatypes">Integral Datatypes</a>, for details) so this
97structure is of size 64 bytes.
98</p>
99<p>The values of several fields have a restricted meaning and/or
100range of values.
101</p>
102<dl compact="compact">
103<dt><code>st_dev</code></dt>
104<dd><p>A value of 0 represents a file, 1 the console.
105</p>
106</dd>
107<dt><code>st_ino</code></dt>
108<dd><p>No valid meaning for the target.  Transmitted unchanged.
109</p>
110</dd>
111<dt><code>st_mode</code></dt>
112<dd><p>Valid mode bits are described in <a href="Constants.html#Constants">Constants</a>.  Any other
113bits have currently no meaning for the target.
114</p>
115</dd>
116<dt><code>st_uid</code></dt>
117<dt><code>st_gid</code></dt>
118<dt><code>st_rdev</code></dt>
119<dd><p>No valid meaning for the target.  Transmitted unchanged.
120</p>
121</dd>
122<dt><code>st_atime</code></dt>
123<dt><code>st_mtime</code></dt>
124<dt><code>st_ctime</code></dt>
125<dd><p>These values have a host and file system dependent
126accuracy.  Especially on Windows hosts, the file system may not
127support exact timing values.
128</p></dd>
129</dl>
130
131<p>The target gets a <code>struct stat</code> of the above representation and is
132responsible for coercing it to the target representation before
133continuing.
134</p>
135<p>Note that due to size differences between the host, target, and protocol
136representations of <code>struct stat</code> members, these members could eventually
137get truncated on the target.
138</p>
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