| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | #include "feature.h" | ||
| 2 | #include <sys/stat.h> | ||
| 3 | #include "fd.h" | ||
| 4 | #include "debug.h" | ||
| 5 | #include "xreadwrite.h" | ||
| 6 | |||
| 7 | 42 | int xpipe2(int fd[2], int flags) | |
| 8 | { | ||
| 9 | 42 | BUG_ON((flags & (O_CLOEXEC | O_NONBLOCK)) != flags); | |
| 10 | |||
| 11 | #if HAVE_PIPE2 | ||
| 12 |
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42 | if (likely(pipe2(fd, flags) == 0)) { |
| 13 | return 0; | ||
| 14 | } | ||
| 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 | ✗ | if (errno != ENOSYS) { | |
| 20 | return -1; | ||
| 21 | } | ||
| 22 | #endif | ||
| 23 | |||
| 24 | // NOLINTNEXTLINE(android-cloexec-pipe) | ||
| 25 | ✗ | if (unlikely(pipe(fd) != 0)) { | |
| 26 | return -1; | ||
| 27 | } | ||
| 28 | |||
| 29 | ✗ | if (flags & O_CLOEXEC) { | |
| 30 | ✗ | if (unlikely(!fd_set_cloexec(fd[0], true) || !fd_set_cloexec(fd[1], true))) { | |
| 31 | ✗ | goto error; | |
| 32 | } | ||
| 33 | } | ||
| 34 | ✗ | if (flags & O_NONBLOCK) { | |
| 35 | ✗ | if (unlikely(!fd_set_nonblock(fd[0], true) || !fd_set_nonblock(fd[1], true))) { | |
| 36 | ✗ | goto error; | |
| 37 | } | ||
| 38 | } | ||
| 39 | |||
| 40 | return 0; | ||
| 41 | |||
| 42 | ✗ | error:; | |
| 43 | ✗ | int e = errno; | |
| 44 | ✗ | xclose(fd[0]); | |
| 45 | ✗ | xclose(fd[1]); | |
| 46 | ✗ | errno = e; | |
| 47 | ✗ | return -1; | |
| 48 | } | ||
| 49 | |||
| 50 | 63 | int xdup3(int oldfd, int newfd, int flags) | |
| 51 | { | ||
| 52 | 63 | BUG_ON((flags & O_CLOEXEC) != flags); | |
| 53 | 63 | int fd; | |
| 54 | |||
| 55 | #if HAVE_DUP3 | ||
| 56 | 126 | do { | |
| 57 | 63 | fd = dup3(oldfd, newfd, flags); | |
| 58 |
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63 | } while (unlikely(fd < 0 && errno == EINTR)); |
| 59 | |||
| 60 |
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63 | if (fd != -1 || errno != ENOSYS) { |
| 61 | return fd; | ||
| 62 | } | ||
| 63 | |||
| 64 | // If execution reaches this point, dup3() failed with ENOSYS | ||
| 65 | // ("function not supported"), so we fall through to the pure | ||
| 66 | // POSIX implementation below. | ||
| 67 | #endif | ||
| 68 | |||
| 69 | ✗ | if (unlikely(oldfd == newfd)) { | |
| 70 | // Replicate dup3() behaviour: | ||
| 71 | ✗ | errno = EINVAL; | |
| 72 | ✗ | return -1; | |
| 73 | } | ||
| 74 | |||
| 75 | ✗ | do { | |
| 76 | ✗ | fd = dup2(oldfd, newfd); | |
| 77 | ✗ | } while (unlikely(fd < 0 && errno == EINTR)); | |
| 78 | |||
| 79 | ✗ | if (fd >= 0 && (flags & O_CLOEXEC)) { | |
| 80 | ✗ | (void)!fd_set_cloexec(fd, true); | |
| 81 | } | ||
| 82 | |||
| 83 | return fd; | ||
| 84 | } | ||
| 85 | |||
| 86 | 2 | int xfchown(int fd, uid_t owner, gid_t group) | |
| 87 | { | ||
| 88 | 2 | int r; | |
| 89 | 4 | do { | |
| 90 | 2 | r = fchown(fd, owner, group); | |
| 91 |
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2 | } while (unlikely(r != 0 && errno == EINTR)); |
| 92 | 2 | return r; | |
| 93 | } | ||
| 94 | |||
| 95 | 21 | int xfchmod(int fd, mode_t mode) | |
| 96 | { | ||
| 97 | 21 | int r; | |
| 98 | 42 | do { | |
| 99 | 21 | r = fchmod(fd, mode); | |
| 100 |
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21 | } while (unlikely(r != 0 && errno == EINTR)); |
| 101 | 21 | return r; | |
| 102 | } | ||
| 103 | |||
| 104 | 21 | int xftruncate(int fd, off_t length) | |
| 105 | { | ||
| 106 | 21 | int r; | |
| 107 | 42 | do { | |
| 108 | 21 | r = ftruncate(fd, length); | |
| 109 |
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21 | } while (unlikely(r != 0 && errno == EINTR)); |
| 110 | 21 | return r; | |
| 111 | } | ||
| 112 | |||
| 113 | ✗ | int xfsync(int fd) | |
| 114 | { | ||
| 115 | #if HAVE_FSYNC | ||
| 116 | ✗ | retry: | |
| 117 | ✗ | if (fsync(fd) == 0) { | |
| 118 | return 0; | ||
| 119 | } | ||
| 120 | |||
| 121 | ✗ | switch (errno) { | |
| 122 | // EINVAL is ignored because it just means "operation not possible | ||
| 123 | // on this descriptor" rather than indicating an actual error | ||
| 124 | case EINVAL: | ||
| 125 | case ENOTSUP: | ||
| 126 | case ENOSYS: | ||
| 127 | return 0; | ||
| 128 | ✗ | case EINTR: | |
| 129 | ✗ | goto retry; | |
| 130 | } | ||
| 131 | |||
| 132 | ✗ | return -1; | |
| 133 | #else | ||
| 134 | (void)fd; | ||
| 135 | return 0; | ||
| 136 | #endif | ||
| 137 | } | ||
| 138 |