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libutil: Add an example for util_log

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Build:
$ make -C libutil/util_log_example

* Every time a -V option is passed, the verbosity level increases and extra
messages are enabled.

Test:
$ ./libutil/util_log_example
 # No output
$ ./libutil/util_log_example -V
ERROR: This is an ERROR message
$ ./libutil/util_log_example -VV
ERROR: This is an ERROR message
 WARN: This is a WARN message
$ ./libutil/util_log_example -VVV
ERROR: This is an ERROR message
 WARN: This is a WARN message
 INFO: This is an INFO message
$ ./libutil/util_log_example -VVVV
ERROR: This is an ERROR message
 WARN: This is a WARN message
 INFO: This is an INFO message
DEBUG: This is a DEBUG message
$ ./libutil/util_log_example -VVVVV
ERROR: This is an ERROR message
 WARN: This is a WARN message
 INFO: This is an INFO message
DEBUG: This is a DEBUG message
TRACE: This is a TRACE message

Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Reviewed-by: Philipp Rudo <prudo@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Alexander Egorenkov
2021-04-22 12:45:40 +02:00
committed by Jan Höppner
parent 568caa0501
commit f6ab7f6cda
2 changed files with 83 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
libutil/Makefile
View File

@@ -8,6 +8,7 @@ examples = util_base_example \
util_scandir_example \
util_file_example \
util_libc_example \
util_log_example \
util_opt_example \
util_opt_command_example \
util_prg_example \
@@ -37,6 +38,7 @@ util_path_example: util_path_example.o $(lib)
util_scandir_example: util_scandir_example.o $(lib)
util_file_example: util_file_example.o $(lib)
util_libc_example: util_libc_example.o $(lib)
util_log_example: util_log_example.o $(lib)
util_opt_example: util_opt_example.o $(lib)
util_opt_command_example: util_opt_command_example.o $(lib)
util_panic_example: util_panic_example.o $(lib)

81
libutil/util_log_example.c Normal file
View File

@@ -0,0 +1,81 @@
/**
* util_log_example - Example program for util_log
*
* Copyright IBM Corp. 2021
*
* s390-tools is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
//! [code]
#include "lib/util_opt.h"
#include "lib/util_prg.h"
#include "lib/util_log.h"
static const struct util_prg prg = {
.desc = "Example for util_log.",
.copyright_vec = {
{
.owner = "IBM Corp.",
.pub_first = 2021,
.pub_last = 2021,
},
UTIL_PRG_COPYRIGHT_END
}
};
static struct util_opt opt_vec[] = {
{
.option = { "verbose", no_argument, NULL, 'V' },
.desc = "Print verbose messages to stderr. "
"This option may be given multiple times and "
"each time this option is given the verbosity level is "
"increased.",
},
UTIL_OPT_HELP,
UTIL_OPT_VERSION,
UTIL_OPT_END
};
int main(int argc, char *argv[])
{
int verbose = -1;
util_prg_init(&prg);
util_opt_init(opt_vec, NULL);
while (1) {
int opt = util_opt_getopt_long(argc, argv);
if (opt == -1)
break;
switch (opt) {
case 'h':
util_prg_print_help();
util_opt_print_help();
exit(EXIT_SUCCESS);
case 'v':
util_prg_print_version();
exit(EXIT_SUCCESS);
case 'V':
verbose++;
break;
case '?':
default:
fprintf(stderr, "Try '--help' for more information.\n");
exit(EXIT_FAILURE);
}
}
util_log_set_level(verbose);
util_log_print(UTIL_LOG_ERROR, "This is an ERROR message\n");
util_log_print(UTIL_LOG_WARN, "This is a WARN message\n");
util_log_print(UTIL_LOG_INFO, "This is an INFO message\n");
util_log_print(UTIL_LOG_DEBUG, "This is a DEBUG message\n");
util_log_print(UTIL_LOG_TRACE, "This is a TRACE message\n");
return EXIT_SUCCESS;
}
//! [code]