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

• pathconf, fpathconf - get value of pathname variable
• pause - suspend process until signal is received
• pclose - close pipe stream
• perror - write error messages to standard error
• pipe - create pipe
• poll - multiplex STREAMs I/O
• popen - initiate pipe stream to or from process
• pow, powf, powl - power function
• printf - write formatted output on standard output stream
• ptsname - name of pseudoterminal
• putc, putc_unlocked - put byte on stream
• putchar, putchar_unlocked - put byte on standard output stream (thread-safe)
• putchar_unlocked - put byte on standard output stream (thread-safe)
• putenv - change or add environment variables
• putmsg, putpmsg - send message to STREAMS file
• putpwent - enter user into user catalog (extension)
• puts - put string on standard output
• pututxline - write utmpx entry
• putw - put word on stream
• putwc - put wide character on stream
• putwchar - put wide character on standard output stream