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diff --git a/man/man3/intro.3 b/man/man3/intro.3 new file mode 100644 index 0000000000..64d8ba68bf --- /dev/null +++ b/man/man3/intro.3 @@ -0,0 +1,90 @@ +.\" Copyright (C) 2007 Michael Kerrisk <mtk.manpages@gmail.com> +.\" +.\" SPDX-License-Identifier: Linux-man-pages-copyleft +.\" +.\" 2007-10-23 mtk, Nearly a complete rewrite of the earlier page. +.TH INTRO 3 2020-11-01 "Linux man-pages (unreleased)" +.SH NAME +intro \- introduction to library functions +.SH DESCRIPTION +Section 3 of the manual describes all library functions excluding the library +functions (system call wrappers) described in Section 2, +which implement system calls. +.PP +Many of the functions described in the section are part of the +Standard C Library +.RI ( libc ). +Some functions are part of other libraries (e.g., +the math library, +.IR libm , +or the real-time library, +.IR librt ) +in which case the manual page will indicate the linker +option needed to link against the required library +(e.g., +.I \-lm +and +.IR \-lrt , +respectively, +for the aforementioned libraries). +.PP +In some cases, +the programmer must define a feature test macro in order to obtain +the declaration of a function from the header file specified +in the man page SYNOPSIS section. +(Where required, these feature test macros must be defined before including +.I any +header files.) +In such cases, the required macro is described in the man page. +For further information on feature test macros, see +.BR feature_test_macros (7). +.\" +.\" There +.\" are various function groups which can be identified by a letter which +.\" is appended to the chapter number: +.\" .IP (3C) +.\" These functions, the functions from chapter 2 and from chapter 3S are +.\" contained in the C standard library libc, which will be used by +.\" .BR cc (1) +.\" by default. +.\" .IP (3S) +.\" These functions are parts of the +.\" .BR stdio (3) +.\" library. They are contained in the standard C library libc. +.\" .IP (3M) +.\" These functions are contained in the arithmetic library libm. They are +.\" used by the +.\" .BR f77 (1) +.\" FORTRAN compiler by default, but not by the +.\" .BR cc (1) +.\" C compiler, which needs the option \fI\-lm\fP. +.\" .IP (3F) +.\" These functions are part of the FORTRAN library libF77. There are no +.\" special compiler flags needed to use these functions. +.\" .IP (3X) +.\" Various special libraries. The manual pages documenting their functions +.\" specify the library names. +.SH STANDARDS +Certain terms and abbreviations are used to indicate UNIX variants +and standards to which calls in this section conform. +See +.BR standards (7). +.SH NOTES +.SS Authors and copyright conditions +Look at the header of the manual page source for the author(s) and copyright +conditions. +Note that these can be different from page to page! +.SH SEE ALSO +.BR intro (2), +.BR errno (3), +.BR capabilities (7), +.BR credentials (7), +.BR environ (7), +.BR feature_test_macros (7), +.BR libc (7), +.BR math_error (7), +.BR path_resolution (7), +.BR pthreads (7), +.BR signal (7), +.BR standards (7), +.BR system_data_types (7) |