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CHMOD(2) System Calls Manual CHMOD(2) NAME chmod, fchmod, chown, fchown, utime - change file mode, owner, group, or times SYNOPSIS int chmod(file, mode) char *name; int fchmod(fildes, mode) int chown(file, uid, gid) char *name; int fchown(fildes, uid, gid) #include <sys/types.h> int utime(file, timep) char *file; time_t timep[2]; DESCRIPTION These functions change inode information for the file named by a null- terminated string or associated with file descriptor fildes. Chmod and fchmod change file permissions and other mode bits to mode. Mode values are defined in stat(2). Only the 07777 bits of mode are significant. Only the owner of a file (or super-user) may change the mode. Only a process in the file's group (or super-user) may set the set-group-id bit, S_ISGID. Chown and fchown change the owner, uid, and the group, gid, of a file. Only the super-user may change a file's owner. The owner of a file may change its group to match the current effective groupid. Other changes are restricted to the super-user. Utime sets the st_atime (access time) and st_mtime (modify time) fields for file to timep[0] and timep[1] respectively. The st_ctime (inode change time) field for file is set to the current time. The caller must be the owner of the file or the super-user. SEE ALSO stat(2), time(2) DIAGNOSTICS all: EIO, EPERM chmod, chown, utime: ELOOP, ENOENT, ENOTDIR, EACCES, EFAULT fchmod, fchown: EBADF BUGS An attempt to change the inode data for a file on a read-only file sys- tem is quietly ignored. CHMOD(2)