68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
#include "pixie-file.h"
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#if defined(WIN32)
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#include <Windows.h>
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#include <io.h>
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#include <fcntl.h>
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#define access _access
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#else
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#include <unistd.h>
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#include <errno.h>
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#endif
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int
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pixie_fopen_shareable(FILE **in_fp, const char *filename, unsigned is_append)
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{
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FILE *fp;
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*in_fp = NULL;
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#if defined(WIN32)
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/* PORTABILITY: WINDOWS
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* This bit of code deals with the fact that on Windows, fopen() opens
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* a file so that it can't be moved. This code opens it a different
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* way so that we can move it.
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*
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* NOTE: this is probably overkill, it appears that there is a better
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* API _fsopen() that does what I want without all this nonsense.
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*/
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{
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HANDLE hFile;
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int fd;
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/* The normal POSIX C functions lock the file */
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/* int fd = open(filename, O_RDWR | O_CREAT, _S_IREAD | _S_IWRITE); */ /* Fails */
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/* int fd = _sopen(filename, O_RDWR | O_CREAT, _SH_DENYNO, _S_IREAD | _S_IWRITE); */ /* Also fails */
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/* We need to use WINAPI + _open_osfhandle to be able to use
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file descriptors (instead of WINAPI handles) */
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hFile = CreateFileA( filename,
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GENERIC_WRITE | (is_append?FILE_APPEND_DATA:0),
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FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
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NULL,
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CREATE_ALWAYS,
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FILE_ATTRIBUTE_TEMPORARY,
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NULL);
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if (hFile == INVALID_HANDLE_VALUE) {
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return -1;
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}
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fd = _open_osfhandle((intptr_t)hFile, _O_CREAT | _O_RDONLY | _O_TEMPORARY);
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if (fd == -1) {
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perror("_open_osfhandle");
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return -1;
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}
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fp = _fdopen(fd, "w");
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}
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#else
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fp = fopen(filename, is_append?"a":"w");
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if (fp == NULL)
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return errno;
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#endif
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*in_fp = fp;
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return 0;
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}
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