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chmod
Changes a file's permission mode. The permission mode controls file ownership and access rights.
#include <sys/types.h> #include <sys/stat.h> #include <errno.h> #include <io.h> int chmod (const char *filename, mode_t pmode);
filename
pmode
pmode contains one or more of the manifest constants defined in SYS/STAT.H. The meaning of pmode is:
| Value | Description |
|---|---|
| S_IRGRP S_IROTH S_IRUSR S_IRWXG S_IRWXO S_IRWXU S_ISGID S_ISUID S_IWGRP S_IWOTH S_IWUSR S_IXGRP S_IXOTH S_IXUSR |
Read permission bit for POSIX file group Read permission bit for POSIX World owner Read permission bit for POSIX file owner Mask for POSIX file group Mask for POSIX World (other) owner Mask for POSIX file owner Set group ID on execution Set user ID on execution Write permission bit for POSIX file group Write permission bit for POSIX World owner Write permission bit for POSIX file owner Execute or search permission bit for POSIX file group Execute or search permission bit for POSIX World owner Execute or search permission bit for POSIX file owner |
Join more than one constant with the bitwise-OR operator (|).
This function translates POSIX file ownership rights this way:
| POSIX Owner | Real-time Owner |
|---|---|
| Owner Group World (other) |
Owner 1 (first accessor) Owner 2 (second accessor) World |
This function also translates POSIX access rights to the real-time OS equivalent this way:
| POSIX Access Rights | RT Access Rights |
|---|---|
| Owner Group World (other) |
Read Delete, Append, and Update Ignored (no real-time OS equivalent) |
| Versions | Defined in | Include | Link to |
|---|---|---|---|
| INtime 3.0 | intime/rt/include/io.h | sys/types.h sys/stat.h errno.h io.h |
clib.lib |