- strtok
- strtok_r
- strtol
- strtold
- strtoll
- strtoq
- strtoul
- strtoull
- strtouq
- strverscmp
- strxfrm
- swab
- swapcontext
- swprintf
- sysconf
- syslog
- system
- tan
- tanh
- tcgetpgrp
- tcgetsid
- tcsetpgrp
- tdelete
- telldir
- tempnam
- termios
- tfind
- tgamma
- tgammaf
- tgammal
- timegm
- timelocal
- timezone
- tmpfile
- tmpnam
- toascii
- tolower
- toupper
- towctrans
- towlower
- towupper
- trunc
- truncf
- truncl
- tsearch
- ttyname
- ttyname_r
- ttyslot
- twalk
- tzname
- tzset
- ulimit
- ungetc
- ungetwc
- unlockpt
- updwtmp
- usleep
- valloc
- vasprintf
- vdprintf
- verr
- verrx
- versionsort
- vfprintf
- vfscanf
- vfwprintf
- vprintf
- vscanf
- vsprintf
- vsscanf
MAN (3)
Library functions, covering in particular the C standard library