prog scrapbook The following functions are not guaranteed to be thread-safe on all UNIX systems:

asctime() basename() catgets() ctime()
dbm_clearerr() dbm_close() dbm_delete() dbm_error()
dbm_fetch() dbm_firstkey() dbm_nextkey() dbm_open()
dbm_store() dirname() drand48() ecvt()
encrypt() endgrent() endpwent() endutxent()
fcvt() gamma() gcvt() getc_unlocked()
getchar_unlocked() getdate() getenv() getgrent()
getgrgid() getgrnam() getlogin() getopt()
getpwnam() getpwent() getpwuid() getutxent()
getutxid() getutxline() getw() gmtime()
l64a() lgamma() lrand48() localtime()
mrand48() nl_langinfo() ptsname() putc_unlocked()
putchar_unlocked() putenv() pututxline() rand()
readdir() setgrent() setkey() setpwent()
setutxent() strerror() strtok() ttyname()