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This section describes the following functions, macros and external variables:

• sbrk - modify size of data segment
• scalb - load exponent of base-independent floating-point number
• scalbn, scalbnf, scalbnl, scalbln, scalblnf, scalblnl - load exponent of base-independent floating-point number
• scanf - read formatted input from standard input stream
• seed48 - set seed (int) for pseudo-random numbers
• seekdir - set position of directory stream
• select - synchronous I/O multiplexing
• semctl, semctl64 - semaphore control operations
• semget - get semaphore ID
• semop - semaphore operations
• setbuf - assign buffering to stream
• setcontext - modify user context
• setenv - add or change environment variable
• setgid - set group ID of process
• setgrent - reset file position indicator to beginning of group file
• setgroups - write group numbers
• setitimer - set interval timer
• _setjmp - set label for non-local jump (without signal mask)
• setjmp - set label for non-local jump
• setkey - set encoding key
• setlocale - set or query locale
• setlogmask - set log priority mask
• setpgid - set process group ID for job control
• setpgrp - set process group ID
• setpriority - set process priority
• setpwent - delete pointer to search user catalog
• setregid - set real and effective group IDs
• setreuid - set real and effective user IDs
• setrlimit, setrlimit64 - set resource limit
• setsid - create session and set process group ID
• setstate - pseudo-random numbers
• setuid - set user ID
• setutxent - reset pointer to utmpx file
• setvbuf - assign buffering to stream
• shmat - shared memory attach operation
• shmctl, shmctl64 - shared memory control operations
• shmdt - shared memory detach operation
• shmget - create shared memory segment
• sigaction - examine and change signal handling
• sigaddset - add signal to signal set
• sigaltstack - set/read alternative stack of signal
• sigdelset - delete signal from signal set
• sigemptyset - initialize and empty signal set
• sigfillset - initialize and fill signal set
• sighold, sigignore - add signal to signal mask / register SIG_IGN for signal
• siginterrupt - change behavior of system calls in response to interrupts
• sigismember - test for member of signal set
• siglongjmp - execute non-local jump using signal
• signal, sighold, sigignore, sigpause, sigrelse, sigset - examine or change signal handling
• signbit - Macro to test the sign
• signgam - variable for sign of lgamma
• sigpause - remove signal from signal mask and deactivate process
• sigpending - examine pending signals
• sigprocmask - examine or change blocked signals
• sigrelse - remove signal from signal mask
• sigsetjmp - set label for non-local jump using signal
• sigset - modify signal handling
• sigstack - set or query alternative stack for signal
• sigsuspend - wait for signal
• sin, sinf, sinl - sine function
• sinh, sinhf, sinhl - hyperbolic sine function
• sleep - suspend process for fixed interval of time
• snprintf - formatted output to a string
• sprintf - write formatted output to string
• sqrt, sqrtf, sqrtl - square root function
• srand - generate pseudo-random numbers with seed
• srand48 - seed (double-precision) pseudo-random number generator
• srandom - pseudo-random numbers
• sscanf - read formatted input from string
• stat, stat64, statx, stat64x - get file status
• statvfs, statvfs64 - read file system information
• __STDC__ - macro for ANSI conformance
• __STDC_VERSION__ - Version of ANSI Standard
• stderr, stdin, stdout - variables for standard I/O streams
• step - compare regular expressions
• strcasecmp, strncasecmp - non-case-sensitive string comparison
• strcat - concatenate two strings
• strchr - scan string for characters
• strcmp - compare two strings
• strcoll - compare strings using collating sequence
• strcpy - copy string
• strcspn - get length of complementary substring
• strdup - duplicate string
• strerror - get message string
• strfill - copy substring (BS2000)
• strfmon - convert monetary value to string
• strftime - convert date and time to string
• strlen - get length of string
• strlower - convert a string to lowercase letters (BS2000)
• strncasecmp - non-case-sensitive string comparisons
• strncat - concatenate two substrings
• strncmp - compare two substrings
• strncpy - copy substring
• strnlen - determine length of a string up to a maximum length
• strpbrk - get first occurrence of character in string
• strptime - convert string to date and time
• strrchr - get last occurrence of character in string
• strspn - get length of substring
• strstr - find substring in string
• strtod, strtof, strtold - convert string to double-precision number
• strtoimax - convert string to integer (intmax_t)
• strtok - split string into tokens
• strtok_r - split string into tokens (thread-safe)
• strtol - convert string to long integer
• strtoll - convert string to long long integer
• strtoul - convert string to unsigned long integer
• strtoull - convert string to unsigned long long
• strtoumax - convert string to integer (uintmax_t)
• strupper - convert string to uppercase letters (BS2000)
• strxfrm - string transformation based on LC_COLLATE
• swab - swap bytes
• swapcontext - swap user context
• swprintf - output formatted wide characters
• swscanf - formatted read
• symlink, symlinkat - make symbolic link to file
• sync - update superblock
• sysconf - get numeric value of configurable system variable
• sysfs - get information on file system type (extension)
• syslog - log message
• system - execute system command