sysctl -e
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albert
parent
cf16b01a99
commit
c0e2e83dbd
2
Makefile
2
Makefile
@ -146,7 +146,7 @@ w.o: w.c
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############ prog.o --> prog
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pmap w uptime tload free vmstat utmp pgrep skill: % : %.o $(LIBPROC)
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pmap w uptime tload free sysctl vmstat utmp pgrep skill: % : %.o $(LIBPROC)
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$(CC) $(LDFLAGS) -o $@ $^
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top: % : %.o $(LIBPROC)
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13
sysctl.8
13
sysctl.8
@ -10,15 +10,15 @@
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.SH NAME
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sysctl \- configure kernel parameters at runtime
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.SH SYNOPSIS
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.B "sysctl [-n] variable ..."
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.B "sysctl [-n] [-e] variable ..."
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.br
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.B "sysctl [-n] -w variable=value ..."
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.B "sysctl [-n] [-e] -w variable=value ..."
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.br
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.B "sysctl [-n] -p <filename> (default /etc/sysctl.conf)"
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.B "sysctl [-n] [-e] -p <filename> (default /etc/sysctl.conf)"
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.br
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.B "sysctl [-n] -a"
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.B "sysctl [-n] [-e] -a"
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.br
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.B "sysctl [-n] -A"
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.B "sysctl [-n] [-e] -A"
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.SH DESCRIPTION
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.B sysctl
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is used to modify kernel parameters at runtime. The parameters available
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@ -42,6 +42,9 @@ quotes. This requires the -w parameter to use.
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.B "-n"
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Use this option to disable printing of the key name when printing values.
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.TP
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.B "-e"
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Use this option to ignore errors about unknown keys.
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.TP
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.B "-w"
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Use this option when you want to change a sysctl setting.
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.TP
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96
sysctl.c
96
sysctl.c
@ -27,16 +27,14 @@
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#include <string.h>
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#include <errno.h>
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#include "proc/procps.h"
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#include "proc/version.h"
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/*
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* Additional types we might need.
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*/
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// Proof that C++ causes brain damage:
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typedef int bool;
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static bool true = 1;
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static bool false = 0;
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/*
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* Globals...
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*/
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@ -45,6 +43,7 @@ static const char PROC_PATH[] = "/proc/sys/";
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static const char DEFAULT_PRELOAD[] = "/etc/sysctl.conf";
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static bool PrintName;
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static bool PrintNewline;
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static bool IgnoreError;
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/* error messages */
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static const char ERR_UNKNOWN_PARAMETER[] = "error: Unknown parameter '%s'\n";
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@ -78,13 +77,13 @@ static void slashdot(char *restrict p, char old, char new){
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*
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*/
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static int Usage(const char *restrict const name) {
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printf("usage: %s [-n] variable ... \n"
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" %s [-n] -w variable=value ... \n"
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" %s [-n] -a \n"
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" %s [-n] -p <file> (default /etc/sysctl.conf) \n"
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" %s [-n] -A\n", name, name, name, name, name);
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printf("usage: %s [-n] [-e] variable ... \n"
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" %s [-n] [-e] -w variable=value ... \n"
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" %s [-n] [-e] -a \n"
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" %s [-n] [-e] -p <file> (default /etc/sysctl.conf) \n"
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" %s [-n] [-e] -A\n", name, name, name, name, name);
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return -1;
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} /* end Usage() */
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}
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/*
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@ -109,7 +108,7 @@ static char *StripLeadingAndTrailingSpaces(char *oneline) {
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t++;
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return t;
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} /* end StripLeadingAndTrailingSpaces() */
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}
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@ -144,16 +143,20 @@ static int ReadSetting(const char *restrict const name) {
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if (!fp) {
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switch(errno) {
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case ENOENT:
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if (!IgnoreError) {
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fprintf(stderr, ERR_INVALID_KEY, outname);
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rc = -1;
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}
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break;
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case EACCES:
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fprintf(stderr, ERR_PERMISSION_DENIED, outname);
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rc = -1;
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break;
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default:
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fprintf(stderr, ERR_UNKNOWN_READING, errno, outname);
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break;
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} /* end switch */
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rc = -1;
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break;
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}
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} else {
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while(fgets(inbuf, 1024, fp)) {
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/* already has the \n in it */
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@ -166,14 +169,14 @@ static int ReadSetting(const char *restrict const name) {
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}
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fprintf(stdout, "%s", inbuf);
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}
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} /* endwhile */
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}
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fclose(fp);
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} /* endif */
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}
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free(tmpname);
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free(outname);
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return rc;
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} /* end ReadSetting() */
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}
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@ -240,14 +243,14 @@ static int WriteSetting(const char *setting) {
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if (!equals) {
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fprintf(stderr, ERR_NO_EQUALS, setting);
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return -1;
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} /* end if */
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}
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value = equals + 1; /* point to the value in name=value */
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if (!*name || !*value || name == equals) {
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fprintf(stderr, ERR_MALFORMED_SETTING, setting);
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return -2;
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} /* end if */
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}
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/* used to open the file */
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tmpname = malloc(equals-name+1+strlen(PROC_PATH));
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@ -267,16 +270,20 @@ static int WriteSetting(const char *setting) {
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if (!fp) {
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switch(errno) {
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case ENOENT:
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if (!IgnoreError) {
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fprintf(stderr, ERR_INVALID_KEY, outname);
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rc = -1;
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}
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break;
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case EACCES:
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fprintf(stderr, ERR_PERMISSION_DENIED, outname);
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rc = -1;
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break;
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default:
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fprintf(stderr, ERR_UNKNOWN_WRITING, errno, outname);
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break;
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} /* end switch */
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rc = -1;
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break;
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}
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} else {
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fprintf(fp, "%s\n", value);
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fclose(fp);
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@ -289,12 +296,12 @@ static int WriteSetting(const char *setting) {
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else
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fprintf(stdout, "%s", value);
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}
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} /* endif */
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}
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free(tmpname);
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free(outname);
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return rc;
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} /* end WriteSetting() */
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}
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@ -303,18 +310,19 @@ static int WriteSetting(const char *setting) {
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* - we parse the file and then reform it (strip out whitespace)
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*
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*/
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static void Preload(const char *restrict const filename) {
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static int Preload(const char *restrict const filename) {
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FILE *fp;
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char oneline[257];
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char buffer[257];
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char *t;
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int n = 0;
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int rc = 0;
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char *name, *value;
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if (!filename || ((fp = fopen(filename, "r")) == NULL)) {
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fprintf(stderr, ERR_PRELOAD_FILE, filename);
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return;
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} /* endif */
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return -1;
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}
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while (fgets(oneline, 256, fp)) {
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oneline[256] = 0;
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@ -331,7 +339,7 @@ static void Preload(const char *restrict const filename) {
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if (!name || !*name) {
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fprintf(stderr, WARN_BAD_LINE, filename, n);
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continue;
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} /* endif */
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}
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StripLeadingAndTrailingSpaces(name);
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@ -339,17 +347,18 @@ static void Preload(const char *restrict const filename) {
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if (!value || !*value) {
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fprintf(stderr, WARN_BAD_LINE, filename, n);
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continue;
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} /* endif */
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}
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while ((*value == ' ' || *value == '\t') && *value != 0)
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value++;
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sprintf(buffer, "%s=%s", name, value);
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WriteSetting(buffer);
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} /* endwhile */
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rc |= WriteSetting(buffer);
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}
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fclose(fp);
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} /* end Preload() */
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return rc;
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}
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@ -366,6 +375,7 @@ int main(int argc, char **argv) {
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PrintName = true;
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PrintNewline = true;
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IgnoreError = false;
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if (argc < 2) {
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return Usage(me);
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@ -383,6 +393,9 @@ int main(int argc, char **argv) {
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case 'n':
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PrintName = false;
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break;
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case 'e':
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IgnoreError = true;
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break;
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case 'w':
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SwitchesAllowed = false;
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WriteMode = true;
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@ -391,32 +404,33 @@ int main(int argc, char **argv) {
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argv++;
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if (argv && *argv && **argv) {
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preloadfile = *argv;
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} /* endif */
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Preload(preloadfile);
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return(0);
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break;
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}
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return Preload(preloadfile);
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case 'a': /* string and integer values (for Linux, all of them) */
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case 'A': /* the above, including "opaques" (would be unprintable) */
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case 'X': /* the above, with opaques completly printed in hex */
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SwitchesAllowed = false;
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return DisplayAll(PROC_PATH, ((*argv)[1] == 'a') ? false : true);
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case 'V':
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fprintf(stdout, "sysctl (%s)\n",procps_version);
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exit(0);
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case 'h':
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case '?':
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return Usage(me);
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default:
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fprintf(stderr, ERR_UNKNOWN_PARAMETER, *argv);
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return Usage(me);
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} /* end switch */
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}
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} else {
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SwitchesAllowed = false;
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if (WriteMode)
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ReturnCode = WriteSetting(*argv);
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else ReadSetting(*argv);
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} /* end if */
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} /* end for */
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else
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ReturnCode = ReadSetting(*argv);
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}
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}
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return ReturnCode;
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} /* end main */
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}
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