CHMOD(2) CHMOD(2) NAME chmod, fchmod - change mode of file SYNOPSIS chmod(name, mode) char *name; fchmod(fd, mode) DESCRIPTION Chmod changes the mode of the file specified by the null- terminated string name to mode. Fchmod changes the mode of an open file referred to by a file descriptor. Modes are constructed by oring together some combination of the fol- lowing: 04000 set user ID on execution 02000 set group ID on execution 01000 save text image after execution 00400 read by owner 00200 write by owner 00100 execute (search on directory) by owner 00070 read, write, execute (search) by group 00007 read, write, execute (search) by others If an executable file is set up for sharing (this is the default) then mode 1000 prevents the system from abandoning the swap-space image of the program-text portion of the file when its last user terminates. Ability to set this bit is restricted to the super-user since swap space is consumed by the images. Only the owner of a file (or the super-user) may change the mode. Only the super-user can set the 1000 mode. SEE ALSO chmod(1) DIAGNOSTICS Zero is returned if the mode is changed; -1 is returned if name cannot be found or if current user is neither the owner of the file nor the super-user.