| 26 | #include "port/pg_iovec.h" |
| 27 | |
| 28 | ssize_t |
| 29 | pg_pwritev(int fd, const struct iovec *iov, int iovcnt, off_t offset) |
| 30 | { |
| 31 | #ifdef HAVE_WRITEV |
| 32 | if (iovcnt == 1) |
| 33 | return pg_pwrite(fd, iov[0].iov_base, iov[0].iov_len, offset); |
| 34 | if (lseek(fd, offset, SEEK_SET) < 0) |
| 35 | return -1; |
| 36 | return writev(fd, iov, iovcnt); |
| 37 | #else |
| 38 | ssize_t sum = 0; |
| 39 | ssize_t part; |
| 40 | |
| 41 | for (int i = 0; i < iovcnt; ++i) |
| 42 | { |
| 43 | part = pg_pwrite(fd, iov[i].iov_base, iov[i].iov_len, offset); |
| 44 | if (part < 0) |
| 45 | { |
| 46 | if (i == 0) |
| 47 | return -1; |
| 48 | else |
| 49 | return sum; |
| 50 | } |
| 51 | sum += part; |
| 52 | offset += part; |
| 53 | if (part < iov[i].iov_len) |
| 54 | return sum; |
| 55 | } |
| 56 | return sum; |
| 57 | #endif |
| 58 | } |
no test coverage detected