OpenCoverage

pipe2.c

Absolute File Name:/home/opencoverage/opencoverage/guest-scripts/coreutils/src/lib/pipe2.c
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1/* Create a pipe, with specific opening flags.-
2 Copyright (C) 2009-2018 Free Software Foundation, Inc.-
3-
4 This program is free software; you can redistribute it and/or modify-
5 it under the terms of the GNU General Public License as published by-
6 the Free Software Foundation; either version 3, or (at your option)-
7 any later version.-
8-
9 This program is distributed in the hope that it will be useful,-
10 but WITHOUT ANY WARRANTY; without even the implied warranty of-
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the-
12 GNU General Public License for more details.-
13-
14 You should have received a copy of the GNU General Public License along-
15 with this program; if not, see <https://www.gnu.org/licenses/>. */-
16-
17#include <config.h>-
18-
19/* Specification. */-
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 __WIN32__) && ! defined __CYGWIN__-
33/* Native Windows API. */-
34-
35# include <io.h>-
36-
37#endif-
38-
39int-
40pipe2 (int fd[2], int flags)-
41{-
42 /* Mingw _pipe() corrupts fd on failure; also, if we succeed at-
43 creating the pipe but later fail at changing fcntl, we want-
44 to leave fd unchanged: http://austingroupbugs.net/view.php?id=467 */-
45 int tmp[2];-
46 tmp[0] = fd[0];-
47 tmp[1] = fd[1];-
48-
49#if HAVE_PIPE2-
50# undef pipe2-
51 /* Try the system call first, if it exists. (We may be running with a glibc-
52 that has the function but with an older kernel that lacks it.) */-
53 {-
54 /* Cache the information whether the system call really exists. */-
55 static int have_pipe2_really; /* 0 = unknown, 1 = yes, -1 = no */-
56 if (have_pipe2_really >= 0)
have_pipe2_really >= 0Description
TRUEevaluated 3720 times by 1 test
Evaluated by:
  • sort
FALSEnever evaluated
0-3720
57 {-
58 int result = pipe2 (fd, flags);-
59 if (!(result < 0 && errno == ENOSYS))
result < 0Description
TRUEnever evaluated
FALSEevaluated 3720 times by 1 test
Evaluated by:
  • sort
(*__errno_location ()) == 38Description
TRUEnever evaluated
FALSEnever evaluated
0-3720
60 {-
61 have_pipe2_really = 1;-
62 return result;
executed 3720 times by 1 test: return result;
Executed by:
  • sort
3720
63 }-
64 have_pipe2_really = -1;-
65 }
never executed: end of block
0
66 }-
67#endif-
68-
69 /* Check the supported flags. */-
70 if ((flags & ~(O_CLOEXEC | O_NONBLOCK | O_BINARY | O_TEXT)) != 0)
(flags & ~( 02... 0 | 0 )) != 0Description
TRUEnever evaluated
FALSEnever evaluated
0
71 {-
72 errno = EINVAL;-
73 return -1;
never executed: return -1;
0
74 }-
75-
76#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__-
77/* Native Windows API. */-
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 /* O_NONBLOCK handling.-
87 On native Windows platforms, O_NONBLOCK is defined by gnulib. Use the-
88 functions defined by the gnulib module 'nonblocking'. */-
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/* Unix API. */-
106-
107 if (pipe (fd) < 0)
pipe (fd) < 0Description
TRUEnever evaluated
FALSEnever evaluated
0
108 return -1;
never executed: return -1;
0
109-
110 /* POSIX <http://www.opengroup.org/onlinepubs/9699919799/functions/pipe.html>-
111 says that initially, the O_NONBLOCK and FD_CLOEXEC flags are cleared on-
112 both fd[0] and fd[1]. */-
113-
114 /* O_NONBLOCK handling.-
115 On Unix platforms, O_NONBLOCK is defined by the system. Use fcntl(). */-
116 if (flags & O_NONBLOCK)
flags & 04000Description
TRUEnever evaluated
FALSEnever evaluated
0
117 {-
118 int fcntl_flags;-
119-
120 if ((fcntl_flags = fcntl (fd[1], F_GETFL, 0)) < 0
(fcntl_flags =...], 3 , 0)) < 0Description
TRUEnever evaluated
FALSEnever evaluated
0
121 || fcntl (fd[1], F_SETFL, fcntl_flags | O_NONBLOCK) == -1
rpl_fcntl (fd[... 04000 ) == -1Description
TRUEnever evaluated
FALSEnever evaluated
0
122 || (fcntl_flags = fcntl (fd[0], F_GETFL, 0)) < 0
(fcntl_flags =...], 3 , 0)) < 0Description
TRUEnever evaluated
FALSEnever evaluated
0
123 || fcntl (fd[0], F_SETFL, fcntl_flags | O_NONBLOCK) == -1)
rpl_fcntl (fd[... 04000 ) == -1Description
TRUEnever evaluated
FALSEnever evaluated
0
124 goto fail;
never executed: goto fail;
0
125 }
never executed: end of block
0
126-
127 if (flags & O_CLOEXEC)
flags & 02000000Description
TRUEnever evaluated
FALSEnever evaluated
0
128 {-
129 int fcntl_flags;-
130-
131 if ((fcntl_flags = fcntl (fd[1], F_GETFD, 0)) < 0
(fcntl_flags =...], 1 , 0)) < 0Description
TRUEnever evaluated
FALSEnever evaluated
0
132 || fcntl (fd[1], F_SETFD, fcntl_flags | FD_CLOEXEC) == -1
rpl_fcntl (fd[...gs | 1 ) == -1Description
TRUEnever evaluated
FALSEnever evaluated
0
133 || (fcntl_flags = fcntl (fd[0], F_GETFD, 0)) < 0
(fcntl_flags =...], 1 , 0)) < 0Description
TRUEnever evaluated
FALSEnever evaluated
0
134 || fcntl (fd[0], F_SETFD, fcntl_flags | FD_CLOEXEC) == -1)
rpl_fcntl (fd[...gs | 1 ) == -1Description
TRUEnever evaluated
FALSEnever evaluated
0
135 goto fail;
never executed: goto fail;
0
136 }
never executed: end of block
0
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;
never executed: return 0;
0
152-
153#endif-
154-
155#if GNULIB_defined_O_NONBLOCK || \-
156 !((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__)-
157 fail:-
158 {-
159 int saved_errno = errno;-
160 close (fd[0]);-
161 close (fd[1]);-
162 fd[0] = tmp[0];-
163 fd[1] = tmp[1];-
164 errno = saved_errno;-
165 return -1;
never executed: return -1;
0
166 }-
167#endif-
168}-
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