@node chmod, file system
@subheading Syntax

@example
#include <sys/stat.h>

int chmod(const char *path, mode_t mode);
@end example

@subheading Description

This function changes the mode (writable or write-only) of the specified
file.  The value of @var{mode} can be a combination of one or more of
the following:

@table @code

@item S_IRUSR

Make the file readable

@item S_IWUSR

Make the file writable

@end table

Other @code{S_I*} values could be included, but they will be ignored.

@subheading Return Value

Zero if the file exists and the mode was changed, else nonzero. 

@subheading Portability

@portability !ansi, posix

@subheading Example

@example
chmod("/tmp/dj.dat", S_IWUSR|S_IRUSR);
@end example