This source file includes following definitions.
- read_nothrow
- rpl_read
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18 #include <config.h>
19
20
21 #include <unistd.h>
22
23 #if defined _WIN32 && ! defined __CYGWIN__
24
25 # include <errno.h>
26 # include <io.h>
27
28 # define WIN32_LEAN_AND_MEAN
29 # include <windows.h>
30
31 # if HAVE_MSVC_INVALID_PARAMETER_HANDLER
32 # include "msvc-inval.h"
33 # endif
34 # if GNULIB_MSVC_NOTHROW
35 # include "msvc-nothrow.h"
36 # else
37 # include <io.h>
38 # endif
39
40
41 # undef GetNamedPipeHandleState
42 # define GetNamedPipeHandleState GetNamedPipeHandleStateA
43
44 # undef read
45
46 # if HAVE_MSVC_INVALID_PARAMETER_HANDLER
47 static ssize_t
48 read_nothrow (int fd, void *buf, size_t count)
49 {
50 ssize_t result;
51
52 TRY_MSVC_INVAL
53 {
54 result = _read (fd, buf, count);
55 }
56 CATCH_MSVC_INVAL
57 {
58 result = -1;
59 errno = EBADF;
60 }
61 DONE_MSVC_INVAL;
62
63 return result;
64 }
65 # else
66 # define read_nothrow _read
67 # endif
68
69 ssize_t
70 rpl_read (int fd, void *buf, size_t count)
71 {
72 ssize_t ret = read_nothrow (fd, buf, count);
73
74 # if GNULIB_NONBLOCKING
75 if (ret < 0
76 && GetLastError () == ERROR_NO_DATA)
77 {
78 HANDLE h = (HANDLE) _get_osfhandle (fd);
79 if (GetFileType (h) == FILE_TYPE_PIPE)
80 {
81
82 DWORD state;
83 if (GetNamedPipeHandleState (h, &state, NULL, NULL, NULL, NULL, 0)
84 && (state & PIPE_NOWAIT) != 0)
85
86
87 errno = EAGAIN;
88 }
89 }
90 # endif
91
92 return ret;
93 }
94
95 #endif