Line | Branch | Exec | Source |
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1 | #include "build-defs.h" | ||
2 | #include <sys/stat.h> | ||
3 | #include "fd.h" | ||
4 | #include "debug.h" | ||
5 | #include "xreadwrite.h" | ||
6 | |||
7 | ✗ | static bool cloexec(int fd) {return fd_set_cloexec(fd, true);} | |
8 | ✗ | static bool nonblock(int fd) {return fd_set_nonblock(fd, true);} | |
9 | |||
10 | 42 | int xpipe2(int fd[static 2], int flags) | |
11 | { | ||
12 | 42 | BUG_ON((flags & (O_CLOEXEC | O_NONBLOCK)) != flags); | |
13 | |||
14 | #if HAVE_PIPE2 | ||
15 | // If pipe2() fails with ENOSYS, it means the function is just a stub | ||
16 | // and not actually supported. In that case, the pure POSIX fallback | ||
17 | // implementation should be tried instead. In other cases, the failure | ||
18 | // is probably caused by a normal error condition. | ||
19 | 42 | int r = pipe2(fd, flags); | |
20 |
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42 | if (likely(r == 0 || errno != ENOSYS)) { |
21 | return r; | ||
22 | } | ||
23 | #endif | ||
24 | |||
25 | // NOLINTNEXTLINE(android-cloexec-pipe) | ||
26 | ✗ | if (unlikely(pipe(fd) != 0)) { | |
27 | return -1; | ||
28 | } | ||
29 | |||
30 | ✗ | bool ok = !(flags & O_CLOEXEC) || (cloexec(fd[0]) && cloexec(fd[1])); | |
31 | ✗ | ok = ok && (!(flags & O_NONBLOCK) || (nonblock(fd[0]) && nonblock(fd[1]))); | |
32 | ✗ | if (unlikely(!ok)) { | |
33 | ✗ | xclose(fd[0]); | |
34 | ✗ | xclose(fd[1]); | |
35 | ✗ | return -1; | |
36 | } | ||
37 | |||
38 | return 0; | ||
39 | } | ||
40 | |||
41 | 63 | int xdup3(int oldfd, int newfd, int flags) | |
42 | { | ||
43 | 63 | BUG_ON((flags & O_CLOEXEC) != flags); | |
44 | 63 | int fd; | |
45 | |||
46 | #if HAVE_DUP3 | ||
47 | 126 | do { | |
48 | 63 | fd = dup3(oldfd, newfd, flags); | |
49 |
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63 | } while (unlikely(fd < 0 && errno == EINTR)); |
50 | |||
51 |
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63 | if (fd != -1 || errno != ENOSYS) { |
52 | return fd; | ||
53 | } | ||
54 | |||
55 | // If execution reaches this point, dup3() failed with ENOSYS | ||
56 | // ("function not supported"), so we fall through to the pure | ||
57 | // POSIX implementation below. | ||
58 | #endif | ||
59 | |||
60 | ✗ | if (unlikely(oldfd == newfd)) { | |
61 | // Replicate dup3() behaviour: | ||
62 | ✗ | errno = EINVAL; | |
63 | ✗ | return -1; | |
64 | } | ||
65 | |||
66 | ✗ | do { | |
67 | ✗ | fd = dup2(oldfd, newfd); | |
68 | ✗ | } while (unlikely(fd < 0 && errno == EINTR)); | |
69 | |||
70 | ✗ | if (fd >= 0 && (flags & O_CLOEXEC)) { | |
71 | ✗ | cloexec(fd); | |
72 | } | ||
73 | |||
74 | return fd; | ||
75 | } | ||
76 | |||
77 | 2 | int xfchown(int fd, uid_t owner, gid_t group) | |
78 | { | ||
79 | 2 | int r; | |
80 | 4 | do { | |
81 | 2 | r = fchown(fd, owner, group); | |
82 |
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2 | } while (unlikely(r != 0 && errno == EINTR)); |
83 | 2 | return r; | |
84 | } | ||
85 | |||
86 | 21 | int xfchmod(int fd, mode_t mode) | |
87 | { | ||
88 | 21 | int r; | |
89 | 42 | do { | |
90 | 21 | r = fchmod(fd, mode); | |
91 |
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21 | } while (unlikely(r != 0 && errno == EINTR)); |
92 | 21 | return r; | |
93 | } | ||
94 | |||
95 | 21 | int xftruncate(int fd, off_t length) | |
96 | { | ||
97 | 21 | int r; | |
98 | 42 | do { | |
99 | 21 | r = ftruncate(fd, length); | |
100 |
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21 | } while (unlikely(r != 0 && errno == EINTR)); |
101 | 21 | return r; | |
102 | } | ||
103 | |||
104 | ✗ | int xfsync(int fd) | |
105 | { | ||
106 | #if HAVE_FSYNC | ||
107 | ✗ | retry: | |
108 | ✗ | if (fsync(fd) == 0) { | |
109 | return 0; | ||
110 | } | ||
111 | |||
112 | ✗ | switch (errno) { | |
113 | // EINVAL is ignored because it just means "operation not possible | ||
114 | // on this descriptor" rather than indicating an actual error | ||
115 | case EINVAL: | ||
116 | case ENOTSUP: | ||
117 | case ENOSYS: | ||
118 | return 0; | ||
119 | ✗ | case EINTR: | |
120 | ✗ | goto retry; | |
121 | } | ||
122 | |||
123 | ✗ | return -1; | |
124 | #else | ||
125 | (void)fd; | ||
126 | return 0; | ||
127 | #endif | ||
128 | } | ||
129 |