POSIX API
Function
fs_fseek()
fs_fsetpos()
fs_fstat()
fs_ftell()
POSIX Equivalent
fseek()
fsetpos()
fstat()
ftell()
Function
fs_rmdir()
fs_setbuf()
fs_setvbuf()
fs_stat()
POSIX Equivalent
rmdir()
setbuf()
setvbuf()
stat()
Table 6-1 POSIX API functions.
6-2 WORKING DIRECTORY FUNCTIONS
Normally, all file or directory paths must be absolute, either on the default volume or on an
explicitly-specified volume:
p_file1 = fs_fopen(“\\file.txt”, “r”);
p_file2 = fs_fopen(“sdcard:0:\\file.txt”, “r”);
/* File on default volume */
/* File on explicitly-specified volume */
If working directory functionality is enabled, paths may be specified relative to the working
directory of the current task:
p_file2 = fs_fopen(“file.txt”, “r”);
p_file1 = fs_fopen(“..\\file.txt”, “r”);
/* File in working directory */
/* File in parent of working directory */
The two standard special path components are supported. The path component “..” moves
to the parent of the current working directory. The path component “.” makes no change;
essentially, it means the current working directory.
fs_chdir() is used to set the working directory. If a relative path is employed before any
working directory is set, the root directory of the default volume is used.
The application can get the working directory with fs_getcwd() . A terminal interface may
use this function to implement an equivalent to the standard pwd (print working directory)
command, while calling fs_chdir() to carry out a cd operation. If working directories are
enabled, the μC/Shell commands for μC/FS manipulate and access the working directory
with fs_chdir() and fs_getcwd() (see also Appendix F, “Shell Commands” on page 535).
85
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