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- #include <sys/syscall.h>
- #include <unistd.h>
- #include <stdint.h>
- #include <endian.h>
- extern __typeof(pread) __libc_pread;
- extern __typeof(pwrite) __libc_pwrite;
- #ifdef __UCLIBC_HAS_LFS__
- extern __typeof(pread64) __libc_pread64;
- extern __typeof(pwrite64) __libc_pwrite64;
- #endif
- #include <bits/kernel_types.h>
- #ifdef __NR_pread
- # define __NR___syscall_pread __NR_pread
- static __inline__ _syscall6(ssize_t, __syscall_pread, int, fd, void *, buf,
- size_t, count, int, pad, off_t, offset_hi, off_t, offset_lo)
- ssize_t __libc_pread(int fd, void *buf, size_t count, off_t offset)
- {
- return __syscall_pread(fd, buf, count, 0, __LONG_LONG_PAIR(offset >> 31, offset));
- }
- weak_alias(__libc_pread,pread)
- # ifdef __UCLIBC_HAS_LFS__
- ssize_t __libc_pread64(int fd, void *buf, size_t count, off64_t offset)
- {
- uint32_t low = offset & 0xffffffff;
- uint32_t high = offset >> 32;
- return __syscall_pread(fd, buf, count, 0, __LONG_LONG_PAIR(high, low));
- }
- weak_alias(__libc_pread64,pread64)
- # endif
- #endif
- #ifdef __NR_pwrite
- # define __NR___syscall_pwrite __NR_pwrite
- static __inline__ _syscall6(ssize_t, __syscall_pwrite, int, fd, const void *, buf,
- size_t, count, int, pad, off_t, offset_hi, off_t, offset_lo)
- ssize_t __libc_pwrite(int fd, const void *buf, size_t count, off_t offset)
- {
- return __syscall_pwrite(fd, buf, count, 0, __LONG_LONG_PAIR(offset >> 31, offset));
- }
- weak_alias(__libc_pwrite,pwrite)
- # ifdef __UCLIBC_HAS_LFS__
- ssize_t __libc_pwrite64(int fd, const void *buf, size_t count, off64_t offset)
- {
- uint32_t low = offset & 0xffffffff;
- uint32_t high = offset >> 32;
- return __syscall_pwrite(fd, buf, count, 0, __LONG_LONG_PAIR(high, low));
- }
- weak_alias(__libc_pwrite64,pwrite64)
- # endif
- #endif
- #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)
- {
- int save_errno;
- ssize_t result;
- off_t old_offset;
-
- if ((old_offset=lseek(fd, 0, SEEK_CUR)) == (off_t) -1)
- return -1;
-
- if (lseek(fd, offset, SEEK_SET) == (off_t) -1)
- return -1;
- if (do_pwrite == 1) {
-
- result = write(fd, buf, count);
- } else {
-
- result = read(fd, buf, count);
- }
-
- save_errno = errno;
- if (lseek(fd, old_offset, SEEK_SET) == (off_t) -1)
- {
- if (result == -1)
- __set_errno(save_errno);
- return -1;
- }
- __set_errno(save_errno);
- return(result);
- }
- # ifdef __UCLIBC_HAS_LFS__
- static ssize_t __fake_pread_write64(int fd, void *buf,
- size_t count, off64_t offset, int do_pwrite)
- {
- int save_errno;
- ssize_t result;
- off64_t old_offset;
-
- if ((old_offset=lseek64(fd, 0, SEEK_CUR)) == (off64_t) -1)
- return -1;
-
- if (lseek64(fd, offset, SEEK_SET) == (off64_t) -1)
- return -1;
- if (do_pwrite == 1) {
-
- result = write(fd, buf, count);
- } else {
-
- result = read(fd, buf, count);
- }
-
- save_errno = errno;
- if (lseek64(fd, old_offset, SEEK_SET) == (off64_t) -1) {
- if (result == -1)
- __set_errno (save_errno);
- return -1;
- }
- __set_errno (save_errno);
- return result;
- }
- # endif
- #endif
- #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)
- # ifdef __UCLIBC_HAS_LFS__
- ssize_t __libc_pread64(int fd, void *buf, size_t count, off64_t offset)
- {
- return __fake_pread_write64(fd, buf, count, offset, 0);
- }
- weak_alias(__libc_pread64,pread64)
- # endif
- #endif
- #ifndef __NR_pwrite
- ssize_t __libc_pwrite(int fd, const void *buf, size_t count, off_t offset)
- {
-
- return __fake_pread_write(fd, (void*)buf, count, offset, 1);
- }
- weak_alias(__libc_pwrite,pwrite)
- # ifdef __UCLIBC_HAS_LFS__
- ssize_t __libc_pwrite64(int fd, const void *buf, size_t count, off64_t offset)
- {
- return __fake_pread_write64(fd, (void*)buf, count, offset, 1);
- }
- weak_alias(__libc_pwrite64,pwrite64)
- # endif
- #endif
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