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sandbox: add lseek helper

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Follow up patches want to be able to seek fd's.

Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2011-10-25 13:02:58 +02:00
parent 4f345d5673
commit e2dcefcb40
2 changed files with 28 additions and 0 deletions
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13
arch/sandbox/cpu/os.c
View file

@ -45,6 +45,19 @@ ssize_t os_write(int fd, const void *buf, size_t count)
return write(fd, buf, count); return write(fd, buf, count);
} }
off_t os_lseek(int fd, off_t offset, int whence)
{
if (whence == OS_SEEK_SET)
whence = SEEK_SET;
else if (whence == OS_SEEK_CUR)
whence = SEEK_CUR;
else if (whence == OS_SEEK_END)
whence = SEEK_END;
else
os_exit(1);
return lseek(fd, offset, whence);
}
int os_open(const char *pathname, int flags) int os_open(const char *pathname, int flags)
{ {
return open(pathname, flags); return open(pathname, flags);

15
include/os.h
View file

@ -48,6 +48,21 @@ ssize_t os_read(int fd, void *buf, size_t count);
*/ */
ssize_t os_write(int fd, const void *buf, size_t count); ssize_t os_write(int fd, const void *buf, size_t count);
/**
* Access to the OS lseek() system call
*
* \param fd File descriptor as returned by os_open()
* \param offset File offset (based on whence)
* \param whence Position offset is relative to (see below)
* \return new file offset
*/
off_t os_lseek(int fd, off_t offset, int whence);
/* Defines for "whence" in os_lseek() */
#define OS_SEEK_SET 0
#define OS_SEEK_CUR 1
#define OS_SEEK_END 2
/** /**
* Access to the OS open() system call * Access to the OS open() system call
* *