diff options
Diffstat (limited to 'lib/libc/string/strerror.3')
| -rw-r--r-- | lib/libc/string/strerror.3 | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/lib/libc/string/strerror.3 b/lib/libc/string/strerror.3 index 39f49d3007ac..3ea4145080cd 100644 --- a/lib/libc/string/strerror.3 +++ b/lib/libc/string/strerror.3 @@ -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 , |