- setutent
- setvbuf
- sigemptyset
- sigpause
- sin
- sinf
- sinh
- sinhf
- sinhl
- sinl
- sleep
- sqrt
- sqrtf
- sqrtl
- srand
- srandom
- sscanf
- stdarg
- stdio
- stpcpy
- strcasecmp
- strcasestr
- strcat
- strchr
- strchul
- strcmp
- strcpy
- strdup
- strdupa
- strerror
- strerror_l
- strerror_r
- strfry
- strftime
- strlen
- strncasecmp
- strncat
- strncmp
- strncpy
- strndup
- strndupa
- strpbrk
- strrchr
- strstr
- strtod
- swab
- swprintf
- sysconf
- syslog
- system
- tan
- tanf
- tanh
- tanhf
- tanhl
- tanl
- telldir
- timezone
- tmpfile
- tmpnam
- tmpnam_r
- toascii
- tolower
- tolower_l
- toupper
- toupper_l
- ttyname
- ttyname_r
- tzname
- tzset
MAN (3)
Library functions, covering in particular the C standard library