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| author | Alexander Ziaee <concussious@runbox.com> | 2024-05-04 14:54:21 +0000 |
|---|---|---|
| committer | Warner Losh <imp@FreeBSD.org> | 2024-05-04 14:56:10 +0000 |
| commit | 9a62cdc0132720c439313707b5e339dc348b0d45 (patch) | |
| tree | 22a9e4bec565e4775445d351a7d68c49a220a8b5 | |
| parent | 69ff2d754c1c8bd9c2b6cea28aa754e9f92f9613 (diff) | |
| download | src-9a62cdc0132720c439313707b5e339dc348b0d45.tar.gz src-9a62cdc0132720c439313707b5e339dc348b0d45.zip | |
intro.2 as errno.2: Use the name macro for errno
Reviewed by: imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/1192
| -rw-r--r-- | lib/libsys/intro.2 | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/lib/libsys/intro.2 b/lib/libsys/intro.2 index f10312c1962a..008936b278ae 100644 --- a/lib/libsys/intro.2 +++ b/lib/libsys/intro.2 @@ -32,8 +32,9 @@ .Dt INTRO 2 .Os .Sh NAME -.Nm intro -.Nd introduction to system calls and error numbers +.Nm intro , +.Nm errno +.Nd introduction to system calls and their error numbers .Sh LIBRARY .Lb libc .Sh SYNOPSIS @@ -333,7 +334,7 @@ Table of currently available system calls. .Sh ERRORS Nearly all of the system calls provide an error number referenced via the external identifier -.Va errno . +.Nm errno . This identifier is defined in .In sys/errno.h as: @@ -349,7 +350,7 @@ For the initial thread and non-threaded processes, .Va __error() returns a pointer to a global -.Va errno +.Nm errno variable that is compatible with the previous definition. .Pp When a system call detects an error, @@ -357,12 +358,12 @@ it returns an integer value indicating failure .Pq usually -1 and sets the variable -.Va errno +.Nm errno accordingly. This allows interpretation of the failure on receiving -1 and to take action accordingly. Successful calls never set -.Va errno ; +.Nm errno ; once set, it remains until another error occurs. It should only be examined after an error. Note that a number of system calls overload the meanings of these |