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libc: Add ftruncate64 and improve 64-bit parameter syscall handling.

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This patch improves the handling of 64-bit parameters in syscalls on ARM.
The ARM EABI mandates that 64-bit quantities be passed in even/odd register
pairs, which requires special treatment.

This allows us to simplify our implementations of pread() and pwrite()
and remove the C stubs for pread64() and pwrite64().

Also add ftruncate64() to <unistd.h>

Change-Id: I407e2fd223ba0093dd2d0b04c6152fadfc9ce3ef

Bug 3107933
This commit is contained in:
David 'Digit' Turner
2010-12-16 16:47:14 +01:00
parent 4a7f31fad7
commit 95d751feac
23 changed files with 181 additions and 116 deletions
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1
libc/include/sys/linux-syscalls.h
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@@ -71,6 +71,7 @@
#define __NR_dup2 (__NR_SYSCALL_BASE + 63)
#define __NR__newselect (__NR_SYSCALL_BASE + 142)
#define __NR_ftruncate (__NR_SYSCALL_BASE + 93)
#define __NR_ftruncate64 (__NR_SYSCALL_BASE + 194)
#define __NR_fsync (__NR_SYSCALL_BASE + 118)
#define __NR_fdatasync (__NR_SYSCALL_BASE + 148)
#define __NR_fchown32 (__NR_SYSCALL_BASE + 207)

5
libc/include/sys/linux-unistd.h
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@@ -52,8 +52,8 @@ int sigaltstack (const stack_t*, stack_t*);
int acct (const char* filepath);
ssize_t read (int, void*, size_t);
ssize_t write (int, const void*, size_t);
ssize_t __pread64 (int, void *, size_t, off_t, off_t);
ssize_t __pwrite64 (int, void *, size_t, off_t, off_t);
ssize_t pread64 (int, void *, size_t, off64_t);
ssize_t pwrite64 (int, void *, size_t, off64_t);
int __open (const char*, int, mode_t);
int __openat (int, const char*, int, mode_t);
int close (int);
@@ -83,6 +83,7 @@ int pipe2 (int *, int);
int dup2 (int, int);
int select (int, struct fd_set *, struct fd_set *, struct fd_set *, struct timeval *);
int ftruncate (int, off_t);
int ftruncate64 (int, off64_t);
int getdents (unsigned int, struct dirent *, unsigned int);
int fsync (int);
int fdatasync (int);

1
libc/include/unistd.h
View File

@@ -145,6 +145,7 @@ extern int flock(int, int);
extern int fsync(int);
extern int fdatasync(int);
extern int ftruncate(int, off_t);
extern int ftruncate64(int, off64_t);
extern int pause(void);
extern unsigned int alarm(unsigned int);