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In example use of err(3) and errx(3), use sysexits(3) constants.

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MFC after:	3 days
Submitted by:	Bruce Cran <bruce at cran dot org dot uk>
This commit is contained in:
Robert Watson 2008-10-31 15:14:40 +00:00
parent 1a0edb10ca
commit 46658b2b2e
1 changed files with 5 additions and 4 deletions
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9
lib/libc/gen/err.3
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@ -178,15 +178,16 @@ or a null pointer
Display the current errno information string and exit:
.Bd -literal -offset indent
if ((p = malloc(size)) == NULL)
err(1, NULL);
err(EX_OSERR, NULL);
if ((fd = open(file_name, O_RDONLY, 0)) == -1)
err(1, "%s", file_name);
err(EX_NOINPUT, "%s", file_name);
.Ed
.Pp
Display an error message and exit:
.Bd -literal -offset indent
if (tm.tm_hour < START_TIME)
errx(1, "too early, wait until %s", start_time_string);
errx(EX_DATAERR, "too early, wait until %s",
start_time_string);
.Ed
.Pp
Warn of an error:
@ -195,7 +196,7 @@ if ((fd = open(raw_device, O_RDONLY, 0)) == -1)
warnx("%s: %s: trying the block device",
raw_device, strerror(errno));
if ((fd = open(block_device, O_RDONLY, 0)) == -1)
err(1, "%s", block_device);
err(EX_OSFILE, "%s", block_device);
.Ed
.Pp
Warn of an error without using the global variable