This source file includes following definitions.
- pipe2
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17 #include <config.h>
18
19
20 #include <unistd.h>
21
22 #include <errno.h>
23 #include <fcntl.h>
24
25 #include "binary-io.h"
26 #include "verify.h"
27
28 #if GNULIB_defined_O_NONBLOCK
29 # include "nonblocking.h"
30 #endif
31
32 #if defined _WIN32 && ! defined __CYGWIN__
33
34
35 # include <io.h>
36
37 #endif
38
39 int
40 pipe2 (int fd[2], int flags)
41 {
42
43
44
45 int tmp[2];
46 tmp[0] = fd[0];
47 tmp[1] = fd[1];
48
49 #if HAVE_PIPE2
50 # undef pipe2
51
52
53 {
54
55 static int have_pipe2_really;
56 if (have_pipe2_really >= 0)
57 {
58 int result = pipe2 (fd, flags);
59 if (!(result < 0 && errno == ENOSYS))
60 {
61 have_pipe2_really = 1;
62 return result;
63 }
64 have_pipe2_really = -1;
65 }
66 }
67 #endif
68
69
70 if ((flags & ~(O_CLOEXEC | O_NONBLOCK | O_BINARY | O_TEXT)) != 0)
71 {
72 errno = EINVAL;
73 return -1;
74 }
75
76 #if defined _WIN32 && ! defined __CYGWIN__
77
78
79 if (_pipe (fd, 4096, flags & ~O_NONBLOCK) < 0)
80 {
81 fd[0] = tmp[0];
82 fd[1] = tmp[1];
83 return -1;
84 }
85
86
87
88
89 # if GNULIB_defined_O_NONBLOCK
90 if (flags & O_NONBLOCK)
91 {
92 if (set_nonblocking_flag (fd[0], true) != 0
93 || set_nonblocking_flag (fd[1], true) != 0)
94 goto fail;
95 }
96 # else
97 {
98 verify (O_NONBLOCK == 0);
99 }
100 # endif
101
102 return 0;
103
104 #else
105
106
107 if (pipe (fd) < 0)
108 return -1;
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114
115
116 if (flags & O_NONBLOCK)
117 {
118 int fcntl_flags;
119
120 if ((fcntl_flags = fcntl (fd[1], F_GETFL, 0)) < 0
121 || fcntl (fd[1], F_SETFL, fcntl_flags | O_NONBLOCK) == -1
122 || (fcntl_flags = fcntl (fd[0], F_GETFL, 0)) < 0
123 || fcntl (fd[0], F_SETFL, fcntl_flags | O_NONBLOCK) == -1)
124 goto fail;
125 }
126
127 if (flags & O_CLOEXEC)
128 {
129 int fcntl_flags;
130
131 if ((fcntl_flags = fcntl (fd[1], F_GETFD, 0)) < 0
132 || fcntl (fd[1], F_SETFD, fcntl_flags | FD_CLOEXEC) == -1
133 || (fcntl_flags = fcntl (fd[0], F_GETFD, 0)) < 0
134 || fcntl (fd[0], F_SETFD, fcntl_flags | FD_CLOEXEC) == -1)
135 goto fail;
136 }
137
138 # if O_BINARY
139 if (flags & O_BINARY)
140 {
141 set_binary_mode (fd[1], O_BINARY);
142 set_binary_mode (fd[0], O_BINARY);
143 }
144 else if (flags & O_TEXT)
145 {
146 set_binary_mode (fd[1], O_TEXT);
147 set_binary_mode (fd[0], O_TEXT);
148 }
149 # endif
150
151 return 0;
152
153 #endif
154
155 #if GNULIB_defined_O_NONBLOCK || !(defined _WIN32 && ! defined __CYGWIN__)
156 fail:
157 {
158 int saved_errno = errno;
159 close (fd[0]);
160 close (fd[1]);
161 fd[0] = tmp[0];
162 fd[1] = tmp[1];
163 errno = saved_errno;
164 return -1;
165 }
166 #endif
167 }