term% cat index.txt CHMOD(2) System Calls Manual 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 following:
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.
CHMOD(2)