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sysctl: add -e: supress warnings about invalid key (Jeremy Kerr <jk@ozlabs.org>)
code shrink: text data bss dec hex filename 775565 929 9100 785594 bfcba busybox_old 775296 929 9100 785325 bfbad busybox_unstripped
This commit is contained in:
Denis Vlasenko
parent
745cd17926
commit
64309f8669
@ -3505,16 +3505,17 @@ USE_FEATURE_RUN_PARTS_FANCY("\n -l Prints names of all matching files even when
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"Configure kernel parameters at runtime" \
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"\n\nOptions:\n" \
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" -n Disable printing of key names\n" \
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" -e Don't warn about unknown keys\n" \
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" -w Change sysctl setting\n" \
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" -p FILE Load sysctl settings from FILE (default /etc/sysctl.conf)\n" \
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" -a Display all values\n" \
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" -A Display all values in table form"
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#define sysctl_example_usage \
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"sysctl [-n] variable...\n" \
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"sysctl [-n] -w variable=value...\n" \
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"sysctl [-n] -a\n" \
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"sysctl [-n] -p file (default /etc/sysctl.conf)\n" \
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"sysctl [-n] -A\n"
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"sysctl [-n] [-e] variable...\n" \
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"sysctl [-n] [-e] -w variable=value...\n" \
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"sysctl [-n] [-e] -a\n" \
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"sysctl [-n] [-e] -p file (default /etc/sysctl.conf)\n" \
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"sysctl [-n] [-e] -A\n"
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#define syslogd_trivial_usage \
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"[OPTION]..."
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154
procps/sysctl.c
154
procps/sysctl.c
@ -16,24 +16,16 @@
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#include "libbb.h"
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/*
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* Function Prototypes
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*/
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static int sysctl_read_setting(const char *setting, int output);
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static int sysctl_write_setting(const char *setting, int output);
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static int sysctl_preload_file(const char *filename, int output);
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static int sysctl_display_all(const char *path, int output, int show_table);
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static int sysctl_read_setting(const char *setting);
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static int sysctl_write_setting(const char *setting);
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static int sysctl_display_all(const char *path);
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static int sysctl_preload_file_and_exit(const char *filename);
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/*
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* Globals...
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*/
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static const char ETC_SYSCTL_CONF[] ALIGN1 = "/etc/sysctl.conf";
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static const char PROC_SYS[] ALIGN1 = "/proc/sys/";
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enum { strlen_PROC_SYS = sizeof(PROC_SYS) - 1 };
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/* error messages */
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static const char ERR_UNKNOWN_PARAMETER[] ALIGN1 =
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"error: unknown parameter '%s'";
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static const char ERR_MALFORMED_SETTING[] ALIGN1 =
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"error: malformed setting '%s'";
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static const char ERR_NO_EQUALS[] ALIGN1 =
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@ -46,8 +38,6 @@ static const char ERR_UNKNOWN_READING[] ALIGN1 =
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"error reading key '%s'";
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static const char ERR_PERMISSION_DENIED[] ALIGN1 =
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"error: permission denied on key '%s'";
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static const char ERR_PRELOAD_FILE[] ALIGN1 =
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"error: cannot open preload file '%s'";
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static const char WARN_BAD_LINE[] ALIGN1 =
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"warning: %s(%d): invalid syntax, continuing";
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@ -57,66 +47,50 @@ static void dwrite_str(int fd, const char *buf)
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write(fd, buf, strlen(buf));
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}
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/*
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* sysctl_main()...
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*/
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enum {
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FLAG_SHOW_KEYS = 1 << 0,
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FLAG_SHOW_KEY_ERRORS = 1 << 1,
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FLAG_TABLE_FORMAT = 1 << 2, /* not implemented */
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FLAG_SHOW_ALL = 1 << 3,
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FLAG_PRELOAD_FILE = 1 << 4,
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FLAG_WRITE = 1 << 5,
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};
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int sysctl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int sysctl_main(int argc, char **argv)
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{
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int retval = 0;
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int output = 1;
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int write_mode = 0;
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int switches_allowed = 1;
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int retval;
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int opt;
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if (argc < 2)
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bb_show_usage();
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opt = getopt32(argv, "+neAapw"); /* '+' - stop on first non-option */
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argv += optind;
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opt ^= (FLAG_SHOW_KEYS | FLAG_SHOW_KEY_ERRORS);
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option_mask32 ^= (FLAG_SHOW_KEYS | FLAG_SHOW_KEY_ERRORS);
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argv++;
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if (opt & (FLAG_TABLE_FORMAT | FLAG_SHOW_ALL))
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return sysctl_display_all(PROC_SYS);
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if (opt & FLAG_PRELOAD_FILE)
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return sysctl_preload_file_and_exit(*argv ? *argv : ETC_SYSCTL_CONF);
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for (; *argv /*&& **argv*/; argv++) {
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if (switches_allowed && **argv == '-') { /* we have a switch */
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switch ((*argv)[1]) {
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case 'n':
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output = 0;
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break;
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case 'w':
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write_mode = 1;
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switches_allowed = 0;
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break;
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case 'p':
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argv++;
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return sysctl_preload_file(((*argv /*&& **argv*/) ? *argv : ETC_SYSCTL_CONF),
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output);
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case 'a':
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case 'A':
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return sysctl_display_all(PROC_SYS, output,
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((*argv)[1] == 'A'));
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default:
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bb_error_msg(ERR_UNKNOWN_PARAMETER, *argv);
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/* fall through */
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//case 'h':
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//case '?':
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bb_show_usage();
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}
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} else {
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switches_allowed = 0;
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if (write_mode)
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retval |= sysctl_write_setting(*argv, output);
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retval = 0;
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while (*argv) {
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if (opt & FLAG_WRITE)
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retval |= sysctl_write_setting(*argv);
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else
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sysctl_read_setting(*argv, output);
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}
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retval |= sysctl_read_setting(*argv);
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argv++;
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}
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return retval;
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} /* end sysctl_main() */
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/*
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* sysctl_preload_file
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* preload the sysctl's from a conf file
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* - we parse the file and then reform it (strip out whitespace)
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*/
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#define PRELOAD_BUF 256
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static int sysctl_preload_file(const char *filename, int output)
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static int sysctl_preload_file_and_exit(const char *filename)
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{
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int lineno;
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char oneline[PRELOAD_BUF];
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@ -124,10 +98,7 @@ static int sysctl_preload_file(const char *filename, int output)
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char *name, *value;
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FILE *fp;
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fp = fopen(filename, "r");
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if (fp == NULL) {
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bb_error_msg_and_die(ERR_PRELOAD_FILE, filename);
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}
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fp = xfopen(filename, "r");
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lineno = 0;
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while (fgets(oneline, sizeof(oneline) - 1, fp)) {
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@ -163,35 +134,36 @@ static int sysctl_preload_file(const char *filename, int output)
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/* safe because sizeof(oneline) == sizeof(buffer) */
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sprintf(buffer, "%s=%s", name, value);
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sysctl_write_setting(buffer, output);
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sysctl_write_setting(buffer);
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}
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if (ENABLE_FEATURE_CLEAN_UP)
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fclose(fp);
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return 0;
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} /* end sysctl_preload_file() */
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} /* end sysctl_preload_file_and_exit() */
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/*
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* Write a single sysctl setting
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*/
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static int sysctl_write_setting(const char *setting, int output)
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static int sysctl_write_setting(const char *setting)
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{
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int retval = 0;
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int retval;
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const char *name;
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const char *value;
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const char *equals;
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char *tmpname, *outname, *cptr;
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int fd = -1;
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int fd;
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name = setting;
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equals = strchr(setting, '=');
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if (!equals) {
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bb_error_msg(ERR_NO_EQUALS, setting);
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return -1;
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return EXIT_FAILURE;
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}
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value = equals + 1; /* point to the value in name=value */
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if (name == equals || !*value) {
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bb_error_msg(ERR_MALFORMED_SETTING, setting);
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return -2;
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return EXIT_FAILURE;
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}
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tmpname = xasprintf("%s%.*s", PROC_SYS, (int)(equals - name), name);
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@ -207,6 +179,7 @@ static int sysctl_write_setting(const char *setting, int output)
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if (fd < 0) {
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switch (errno) {
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case ENOENT:
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if (option_mask32 & FLAG_SHOW_KEY_ERRORS)
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bb_error_msg(ERR_INVALID_KEY, outname);
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break;
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case EACCES:
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@ -216,16 +189,15 @@ static int sysctl_write_setting(const char *setting, int output)
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bb_perror_msg(ERR_UNKNOWN_WRITING, outname);
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break;
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}
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retval = -1;
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retval = EXIT_FAILURE;
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} else {
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dwrite_str(fd, value);
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close(fd);
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if (output) {
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dwrite_str(STDOUT_FILENO, outname);
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dwrite_str(STDOUT_FILENO, " = ");
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if (option_mask32 & FLAG_SHOW_KEYS) {
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printf("%s = ", outname);
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}
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dwrite_str(STDOUT_FILENO, value);
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dwrite_str(STDOUT_FILENO, "\n");
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puts(value);
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retval = EXIT_SUCCESS;
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}
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free(tmpname);
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@ -236,18 +208,19 @@ static int sysctl_write_setting(const char *setting, int output)
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/*
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* Read a sysctl setting
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*/
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static int sysctl_read_setting(const char *setting, int output)
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static int sysctl_read_setting(const char *name)
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{
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int retval = 0;
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int retval;
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char *tmpname, *outname, *cptr;
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char inbuf[1025];
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const char *name;
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FILE *fp;
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if (!*setting)
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bb_error_msg(ERR_INVALID_KEY, setting);
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if (!*name) {
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if (option_mask32 & FLAG_SHOW_KEY_ERRORS)
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bb_error_msg(ERR_INVALID_KEY, name);
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return -1;
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}
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name = setting;
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tmpname = concat_path_file(PROC_SYS, name);
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outname = xstrdup(tmpname + strlen_PROC_SYS);
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@ -260,6 +233,7 @@ static int sysctl_read_setting(const char *setting, int output)
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if (fp == NULL) {
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switch (errno) {
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case ENOENT:
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if (option_mask32 & FLAG_SHOW_KEY_ERRORS)
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bb_error_msg(ERR_INVALID_KEY, outname);
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break;
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case EACCES:
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@ -269,16 +243,16 @@ static int sysctl_read_setting(const char *setting, int output)
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bb_perror_msg(ERR_UNKNOWN_READING, outname);
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break;
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}
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retval = -1;
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retval = EXIT_FAILURE;
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} else {
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while (fgets(inbuf, sizeof(inbuf) - 1, fp)) {
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if (output) {
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dwrite_str(STDOUT_FILENO, outname);
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dwrite_str(STDOUT_FILENO, " = ");
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if (option_mask32 & FLAG_SHOW_KEYS) {
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printf("%s = ", outname);
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}
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dwrite_str(STDOUT_FILENO, inbuf);
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fputs(inbuf, stdout);
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}
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fclose(fp);
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retval = EXIT_SUCCESS;
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}
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free(tmpname);
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@ -289,7 +263,7 @@ static int sysctl_read_setting(const char *setting, int output)
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/*
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* Display all the sysctl settings
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*/
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static int sysctl_display_all(const char *path, int output, int show_table)
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static int sysctl_display_all(const char *path)
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{
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int retval = 0;
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DIR *dp;
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@ -299,18 +273,18 @@ static int sysctl_display_all(const char *path, int output, int show_table)
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dp = opendir(path);
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if (!dp) {
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return -1;
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return EXIT_FAILURE;
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}
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while ((de = readdir(dp)) != NULL) {
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tmpdir = concat_subpath_file(path, de->d_name);
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if (tmpdir == NULL)
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continue;
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continue; /* . or .. */
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if (stat(tmpdir, &ts) != 0) {
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bb_perror_msg(tmpdir);
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} else if (S_ISDIR(ts.st_mode)) {
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sysctl_display_all(tmpdir, output, show_table);
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retval |= sysctl_display_all(tmpdir);
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} else {
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retval |= sysctl_read_setting(tmpdir + strlen_PROC_SYS, output);
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retval |= sysctl_read_setting(tmpdir + strlen_PROC_SYS);
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}
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free(tmpdir);
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} /* end while */
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