diff options
Diffstat (limited to 'libc/sysdeps/linux/common/pread_write.c')
| -rw-r--r-- | libc/sysdeps/linux/common/pread_write.c | 160 |
1 files changed, 72 insertions, 88 deletions
diff --git a/libc/sysdeps/linux/common/pread_write.c b/libc/sysdeps/linux/common/pread_write.c index 4aa1fdf7e..61d1bee4f 100644 --- a/libc/sysdeps/linux/common/pread_write.c +++ b/libc/sysdeps/linux/common/pread_write.c @@ -23,41 +23,72 @@ * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ +#define _GNU_SOURCE +#define _LARGEFILE64_SOURCE #include <features.h> -#if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS != 64 -#undef _FILE_OFFSET_BITS -#define _FILE_OFFSET_BITS 64 -#endif -#ifndef __USE_LARGEFILE64 -# define __USE_LARGEFILE64 1 -#endif +#undef __OPTIMIZE__ /* We absolutely do _NOT_ want interfaces silently - * renamed under us or very bad things will happen... */ + * * * renamed under us or very bad things will happen... */ #ifdef __USE_FILE_OFFSET64 # undef __USE_FILE_OFFSET64 #endif + #include <errno.h> #include <sys/types.h> #include <sys/syscall.h> -#define _XOPEN_SOURCE 500 #include <unistd.h> #ifdef __NR_pread -#define __NR___syscall_pread __NR_pread -static inline _syscall5(ssize_t, __syscall_pread, int, fd, void *, buf, size_t, count, - __off_t, offset_hi, __off_t, offset_lo); +#define __NR___libc_pread __NR_pread +_syscall4(ssize_t, __libc_pread, int, fd, void *, buf, size_t, count, off_t, offset); +weak_alias (__libc_pread, pread) +#if defined __UCLIBC_HAVE_LFS__ + +#ifndef INLINE_SYSCALL +#define INLINE_SYSCALL(name, nr, args...) __syscall_pread (args) +#define __NR___syscall_pread __NR_pread +static inline _syscall5(ssize_t, __syscall_pread, int, fd, void *, buf, + size_t, count, off_t, offset_hi, off_t, offset_lo); #endif +ssize_t __libc_pread64(int fd, void *buf, size_t count, off64_t offset) +{ + return(INLINE_SYSCALL (pread, 5, fd, buf, + count, __LONG_LONG_PAIR ((off_t) (offset >> 32), (off_t) (offset & 0xffffffff)))); +} +weak_alias (__libc_pread64, pread64) +#endif /* __UCLIBC_HAVE_LFS__ */ +#endif /* __NR_pread */ + + #ifdef __NR_pwrite -#define __NR___syscall_pwrite __NR_pwrite -static inline _syscall5(ssize_t, __syscall_pwrite, int, fd, const void *, buf, size_t, count, - __off_t, offset_hi, __off_t, offset_lo); +#define __NR___libc_pwrite __NR_pwrite +_syscall4(ssize_t, __libc_pwrite, int, fd, const void *, buf, size_t, count, off_t, offset); +weak_alias (__libc_pwrite, pwrite) +#if defined __UCLIBC_HAVE_LFS__ + +#ifndef INLINE_SYSCALL +#define INLINE_SYSCALL(name, nr, args...) __syscall_write (args) +#define __NR___syscall_write __NR_write +static inline _syscall5(ssize_t, __syscall_write, int, fd, const void *, buf, + size_t, count, off_t, offset_hi, off_t, offset_lo); #endif +ssize_t __libc_pwrite64(int fd, const void *buf, size_t count, off64_t offset) +{ + return(INLINE_SYSCALL (pwrite, 5, fd, buf, + count, __LONG_LONG_PAIR ((off_t) (offset >> 32), (off_t) (offset & 0xffffffff)))); +} +weak_alias (__libc_pwrite64, pwrite64) +#endif /* __UCLIBC_HAVE_LFS__ */ +#endif /* __NR_pwrite */ + + +#if ! defined __NR_pread || ! defined __NR_pwrite static ssize_t __fake_pread_write(int fd, void *buf, - size_t count, __off_t offset, int do_pwrite) + size_t count, off_t offset, int do_pwrite) { int save_errno; ssize_t result; @@ -69,7 +100,7 @@ static ssize_t __fake_pread_write(int fd, void *buf, return -1; /* Set to wanted position. */ - if (lseek (fd, offset, SEEK_SET) == (__off_t) -1) + if (lseek (fd, offset, SEEK_SET) == (off_t) -1) return -1; if (do_pwrite==1) { @@ -83,7 +114,7 @@ static ssize_t __fake_pread_write(int fd, void *buf, /* Now we have to restore the position. If this fails we * have to return this as an error. */ save_errno = errno; - if (lseek(fd, old_offset, SEEK_SET) == (__off_t) -1) + if (lseek(fd, old_offset, SEEK_SET) == (off_t) -1) { if (result == -1) __set_errno(save_errno); @@ -93,47 +124,6 @@ static ssize_t __fake_pread_write(int fd, void *buf, return(result); } -ssize_t __libc_pread(int fd, void *buf, size_t count, __off_t offset) -{ -#ifndef __NR_pread - return(__fake_pread_write(fd, buf, count, offset, 0)); -#else - ssize_t result; - - /* First try the syscall. */ - result = __syscall_pread(fd, buf, count, __LONG_LONG_PAIR(0, offset)); - - /* Bummer. Syscall failed or is missing. Fake it */ - if (result == -1 && errno == ENOSYS) { - result = __fake_pread_write(fd, buf, count, offset, 0); - } -#endif - return result; -} -weak_alias (__libc_pread, pread) - -ssize_t __libc_pwrite(int fd, const void *buf, size_t count, __off_t offset) -{ -#ifndef __NR_pwrite - return(__fake_pread_write(fd, buf, count, offset, 1)); -#else - ssize_t result; - - /* First try the syscall. */ - result = __syscall_pwrite(fd, buf, count, __LONG_LONG_PAIR(0, offset)); - - /* Bummer. Syscall failed or is missing. Fake it */ - if (result == -1 && errno == ENOSYS) { - result = __fake_pread_write(fd, (void*)buf, count, offset, 1); - } -#endif - return result; -} -weak_alias (__libc_pwrite, pwrite) - - - - #if defined __UCLIBC_HAVE_LFS__ static ssize_t __fake_pread_write64(int fd, void *buf, size_t count, off64_t offset, int do_pwrite) @@ -169,45 +159,39 @@ static ssize_t __fake_pread_write64(int fd, void *buf, __set_errno (save_errno); return result; } +#endif /* __UCLIBC_HAVE_LFS__ */ +#endif /* ! defined __NR_pread || ! defined __NR_pwrite */ + +#ifndef __NR_pread +ssize_t __libc_pread(int fd, void *buf, size_t count, off_t offset) +{ + return(__fake_pread_write(fd, buf, count, offset, 0)); +} +weak_alias (__libc_pread, pread) +#if defined __UCLIBC_HAVE_LFS__ ssize_t __libc_pread64(int fd, void *buf, size_t count, off64_t offset) { -#ifndef __NR_pread return(__fake_pread_write64(fd, buf, count, offset, 0)); -#else - ssize_t result; - /* First try the syscall. */ - result = __syscall_pread(fd, buf, count, - __LONG_LONG_PAIR((__off_t) (offset >> 32), (__off_t) (offset & 0xffffffff))); - - /* Bummer. Syscall failed or is missing. Fake it */ - if (result == -1 && errno == ENOSYS) { - result = __fake_pread_write64(fd, buf, count, offset, 0); - } - return result; -#endif } weak_alias (__libc_pread64, pread64) +#endif /* __UCLIBC_HAVE_LFS__ */ +#endif /* ! __NR_pread */ + + +#ifndef __NR_pwrite +ssize_t __libc_pwrite(int fd, const void *buf, size_t count, off_t offset) +{ + return(__fake_pread_write(fd, buf, count, offset, 1)); +} +weak_alias (__libc_pwrite, pwrite) +#if defined __UCLIBC_HAVE_LFS__ ssize_t __libc_pwrite64(int fd, const void *buf, size_t count, off64_t offset) { -#ifndef __NR_pwrite return(__fake_pread_write64(fd, (void*)buf, count, offset, 1)); -#else - ssize_t result; - - /* First try the syscall. */ - result = __syscall_pwrite(fd, buf, count, - __LONG_LONG_PAIR((__off_t) (offset >> 32), (__off_t) (offset & 0xffffffff))); - - /* Bummer. Syscall failed or is missing. Fake it */ - if (result == -1 && errno == ENOSYS) { - result = __fake_pread_write64(fd, (void*)buf, count, offset, 1); - } - return result; -#endif } weak_alias (__libc_pwrite64, pwrite64) - -#endif +#endif /* __UCLIBC_HAVE_LFS__ */ +#endif /* ! __NR_pwrite */ |