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Annotation of coherent/a/usr/man/COHERENT/chmod, revision 1.1.1.1

1.1       root        1: 
                      2: 
                      3: chmod()                COHERENT System Call               chmod()
                      4: 
                      5: 
                      6: 
                      7: 
                      8: Change file-protection modes
                      9: 
                     10: #include <sys/stat.h>
                     11: cchhmmoodd(_f_i_l_e, _m_o_d_e)
                     12: cchhaarr *_f_i_l_e; iinntt _m_o_d_e;
                     13: 
                     14: chmod sets the mode bits for file.  The mode bits include protec-
                     15: tion bits, the set-user-id bit, and the sticky bit.
                     16: 
                     17: mode is  constructed from the logical OR  of the following, which
                     18: are defined symbolically in the header file stat.h:
                     19: 
                     20: 
                     21:           04000  Set user identifier
                     22:           02000  Set group identifier
                     23:           01000  Save file on swap device (``sticky bit'')
                     24:           00400  Read permission for owner
                     25:           00200  Write permission for owner
                     26:           00100  Execute permission for owner
                     27:           00040  Read permission for members of owner's group
                     28:           00020  Write permission for members of owner's group
                     29:           00010  Execute permission for members of owner's group
                     30:           00004  Read permission for other users
                     31:           00002  Write permission for other users
                     32:           00001  Execute permission for other users
                     33: 
                     34: 
                     35: For directories,  some protection bits have  a different meaning:
                     36: write permission means  files may be created and removed, whereas
                     37: execute permission means that the directory may be searched.
                     38: 
                     39: The save-text  bit (or  ``sticky bit'') is  a flag to  the system
                     40: when it executes a shared for of a load module.  After the system
                     41: runs the program, it leaves shared segments on the swap device to
                     42: speed subsequent  reinvocation of the program.   Setting this bit
                     43: is  restricted to  the superuser  (to  control depletion  of swap
                     44: space which might result from overuse).
                     45: 
                     46: Only the owner of a file or the superuser may change its mode.
                     47: 
                     48: ***** See Also *****
                     49: 
                     50: COHERENT system calls, creat()
                     51: 
                     52: ***** Diagnostics *****
                     53: 
                     54: chmod returns  -1 for errors,  such as file  being nonexistent or
                     55: the invoker being neither the owner nor the superuser.
                     56: 
                     57: 
                     58: 
                     59: 
                     60: 
                     61: 
                     62: 
                     63: 
                     64: COHERENT Lexicon                                           Page 1
                     65: 
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