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author | Mateusz Piotrowski <0mp@FreeBSD.org> | 2020-12-17 12:41:47 +0000 |
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committer | Mateusz Piotrowski <0mp@FreeBSD.org> | 2020-12-17 12:41:47 +0000 |
commit | 87394cdd011a57807fe044046476981f2b0142c2 (patch) | |
tree | f9f167597e0a7d6e4a629abe0d5d7592c8b16e91 /lib/libc/string/strerror.3 | |
parent | ebebc41e4cfe44b8e8fd881badf2fa2c4be65aa4 (diff) |
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
Notes
Notes:
svn path=/head/; revision=368714
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 , |