From: Takashi Iwai <tiwai@suse.de>
Date: Mon, 19 Feb 2007 11:59:06 +0000 (+0100)
Subject: Fix LFS support for fopen in alsa-oss
X-Git-Tag: v1.0.14rc4~1
X-Git-Url: https://git.alsa-project.org/?a=commitdiff_plain;h=6d7f089d7e3fedadc381b9608f21c8a711db3cb6;p=alsa-oss.git

Fix LFS support for fopen in alsa-oss

fopen64 is overloaded to call original fopen, not fopen64. This makes
certain applications fail (vmware working with large disk images).

Attached patch fixes the problem and also makes open64 support more
straightforward.

From: Constantine Gavrilov <constantine.gavrilov@gmail.com>
---

diff --git a/alsa/alsa-oss.c b/alsa/alsa-oss.c
index 4dad53c..e1568b8 100644
--- a/alsa/alsa-oss.c
+++ b/alsa/alsa-oss.c
@@ -69,6 +69,7 @@
 static int (*_select)(int n, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout);
 static int (*_poll)(struct pollfd *ufds, unsigned int nfds, int timeout);
 static int (*_open)(const char *file, int oflag, ...);
+static int (*_open64)(const char *file, int oflag, ...);
 static int (*_close)(int fd);
 static ssize_t (*_write)(int fd, const void *buf, size_t n);
 static ssize_t (*_read)(int fd, void *buf, size_t n);
@@ -78,6 +79,7 @@ static void *(*_mmap)(void *addr, size_t len, int prot, int flags, int fd, off_t
 static int (*_munmap)(void* addr, size_t len);
 
 static FILE *(*_fopen)(const char *path, const char *mode);
+static FILE *(*_fopen64)(const char *path, const char *mode);
 
 typedef struct ops {
 	int (*close)(int fd);
@@ -242,58 +244,74 @@ static ops_t ops[FD_CLASSES] = {
 	},
 };
 
-int open(const char *file, int oflag, ...)
+static int dsp_open_helper(const char *file, int oflag)
 {
-	va_list args;
-	mode_t mode = 0;
 	int fd;
-
-	if (!initialized)
-		initialize();
-
-	if (oflag & O_CREAT) {
-		va_start(args, oflag);
-		mode = va_arg(args, mode_t);
-		va_end(args);
-	}
-	if (is_dsp_device(file)) {
-		fd = lib_oss_pcm_open(file, oflag);
-		if (fd >= 0) {
-			int nfds;
-			fds[fd] = calloc(sizeof(fd_t), 1);
-			if (fds[fd] == NULL) {
-				ops[FD_OSS_DSP].close(fd);
-				errno = ENOMEM;
-				return -1;
-			}
-			fds[fd]->class = FD_OSS_DSP;
-			fds[fd]->oflags = oflag;
-			nfds = lib_oss_pcm_poll_fds(fd);
-			if (nfds > 0) {
-				fds[fd]->poll_fds = nfds;
-				poll_fds_add += nfds;
-			}
+	fd = lib_oss_pcm_open(file, oflag);
+	if (fd >= 0) {
+		int nfds;
+		fds[fd] = calloc(sizeof(fd_t), 1);
+		if (fds[fd] == NULL) {
+			ops[FD_OSS_DSP].close(fd);
+			errno = ENOMEM;
+			return -1;
 		}
-	} else if (is_mixer_device(file)) {
-		fd = lib_oss_mixer_open(file, oflag);
-		if (fd >= 0) {
-			fds[fd] = calloc(sizeof(fd_t), 1);
-			if (fds[fd] == NULL) {
-				ops[FD_OSS_MIXER].close(fd);
-				errno = ENOMEM;
-				return -1;
-			}
-			fds[fd]->class = FD_OSS_MIXER;
-			fds[fd]->oflags = oflag;
+		fds[fd]->class = FD_OSS_DSP;
+		fds[fd]->oflags = oflag;
+		nfds = lib_oss_pcm_poll_fds(fd);
+		if (nfds > 0) {
+			fds[fd]->poll_fds = nfds;
+			poll_fds_add += nfds;
 		}
-	} else {
-		fd = _open(file, oflag, mode);
-		if (fd >= 0)
-			assert(fds[fd] == NULL);
 	}
 	return fd;
 }
 
+static int mixer_open_helper(const char *file, int oflag)
+{
+	int fd;
+	fd = lib_oss_mixer_open(file, oflag);
+	if (fd >= 0) {
+		fds[fd] = calloc(sizeof(fd_t), 1);
+		if (fds[fd] == NULL) {
+			ops[FD_OSS_MIXER].close(fd);
+			errno = ENOMEM;
+			return -1;
+		}
+		fds[fd]->class = FD_OSS_MIXER;
+		fds[fd]->oflags = oflag;
+	}
+	return fd;
+} 
+
+#define DECL_OPEN(name, callback) \
+int name(const char *file, int oflag, ...) \
+{ \
+	va_list args; \
+	mode_t mode = 0; \
+	int fd; \
+	if (!initialized) \
+		initialize(); \
+	if (oflag & O_CREAT) { \
+		va_start(args, oflag); \
+		mode = va_arg(args, mode_t); \
+		va_end(args); \
+	} \
+	if (is_dsp_device(file)) \
+		fd = dsp_open_helper(file, oflag); \
+	else if (is_mixer_device(file)) \
+		fd = mixer_open_helper(file, oflag); \
+	else { \
+		fd = callback(file, oflag, mode); \
+		if (fd >= 0) \
+			assert(fds[fd] == NULL); \
+	} \
+	return fd; \
+}
+
+DECL_OPEN(open, _open)
+DECL_OPEN(open64, _open64)
+
 int close(int fd)
 {
 	if (!initialized)
@@ -730,7 +748,7 @@ FILE *fopen64(const char* path, const char *mode)
 		initialize(); 
 
 	if (!is_dsp_device(path))
-		return _fopen(path, mode);
+		return _fopen64(path, mode);
 
 	return fake_fopen(path, mode, O_LARGEFILE);
 }
@@ -766,19 +784,6 @@ int dup2(int fd, int fd2)
 }
 #endif
 
-int open64(const char *file, int oflag, ...)
-{
-	va_list args;
-	mode_t mode = 0;
-
-	if (oflag & O_CREAT) {
-		va_start(args, oflag);
-		mode = va_arg(args, mode_t);
-		va_end(args);
-	}
-	return open(file, oflag | O_LARGEFILE, mode);
-}
-
 # define strong_alias(name, aliasname) \
   extern __typeof (name) aliasname __attribute__ ((alias (#name)));
 
@@ -809,6 +814,7 @@ static void initialize()
 	if (!fds)
 		exit(1);
 	_open = dlsym(RTLD_NEXT, "open");
+	_open64 = dlsym(RTLD_NEXT, "open64");
 	_close = dlsym(RTLD_NEXT, "close");
 	_write = dlsym(RTLD_NEXT, "write");
 	_read = dlsym(RTLD_NEXT, "read");
@@ -819,5 +825,6 @@ static void initialize()
 	_select = dlsym(RTLD_NEXT, "select");
 	_poll = dlsym(RTLD_NEXT, "poll");
 	_fopen = dlsym(RTLD_NEXT, "fopen");
+	_fopen64 = dlsym(RTLD_NEXT, "fopen64");
 	initialized = 1;
 }