Author: 0mp (doc,ports committer) Date: Thu Dec 17 12:41:47 2020 New Revision: 368714 URL: https://svnweb.freebsd.org/changeset/base/368714
Log: strerror.3: Add an example for perror() This is a nice and quick reference. Reviewed by: jilles, yuripv MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D27623 Modified: head/lib/libc/string/strerror.3 Modified: head/lib/libc/string/strerror.3 ============================================================================== --- head/lib/libc/string/strerror.3 Thu Dec 17 03:42:54 2020 (r368713) +++ head/lib/libc/string/strerror.3 Thu Dec 17 12:41:47 2020 (r368714) @@ -32,7 +32,7 @@ .\" @(#)strerror.3 8.1 (Berkeley) 6/9/93 .\" $FreeBSD$ .\" -.Dd December 7, 2020 +.Dd December 17, 2020 .Dt STRERROR 3 .Os .Sh NAME @@ -170,6 +170,31 @@ The use of these variables is deprecated; or .Fn strerror_r should be used instead. +.Sh EXAMPLES +The following example shows how to use +.Fn perror +to report an error. +.Bd -literal -offset 2n +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> + +int +main(void) +{ + int fd; + + if ((fd = open("/nonexistent", O_RDONLY)) == -1) { + perror("open()"); + exit(1); + } + printf("File descriptor: %d\en", fd); + return (0); +} +.Ed +.Pp +When executed, the program will print an error message along the lines of +.Ql "open(): No such file or directory" . .Sh SEE ALSO .Xr intro 2 , .Xr err 3 , _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
