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sysctl -N

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This commit is contained in:
albert 2004-07-15 15:22:23 +00:00
parent 34c4da73d1
commit b357452770
3 changed files with 71 additions and 28 deletions
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12
NEWS
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@ -4,15 +4,15 @@ move striping from install command to CFLAGS
now using gcc -fweb and -frename-registers options
avoid warning about -lncurses when not linking -- thanks FLWM
tolerate IA-64 headers without PAGE_SIZE
watch: allow sub-second intervals -- thanks Thomas Stewart
sysctl: -q option
sysctl: better error handling of failed writes
ps: personality-specific -x support (HP-UX and SVR4-MP)
ps: k option, same as --sort
vmstat: fixed -d
ps: personality-specific -x support (HP-UX and SVR4-MP)
sysctl: -q and -N options
sysctl: better error handling of failed writes
top: tolerate sparse CPU numbering
top: try to handle terminals lacking rmam and smam #235003
top: xterm dislikes clear-to-eol at eol (char lost)
top: tolerate sparse CPU numbering
vmstat: fixed -d
watch: allow sub-second intervals -- thanks Thomas Stewart
procps-3.2.0 --> procps-3.2.1

4
sysctl.8
View File

@ -46,6 +46,10 @@ Use this option to disable printing of the key name when printing values.
Use this option to ignore errors about unknown keys.
.TP
.B "-q"
Use this option to only print the names. It may be useful with shells that
have programmable completion.
.TP
.B "-q"
Use this option to not display the values set to stdout.
.TP
.B "-w"

83
sysctl.c
View File

@ -45,6 +45,7 @@ static bool false = 0;
static const char PROC_PATH[] = "/proc/sys/";
static const char DEFAULT_PRELOAD[] = "/etc/sysctl.conf";
static bool NameOnly;
static bool PrintName;
static bool PrintNewline;
static bool IgnoreError;
@ -115,7 +116,7 @@ static char *StripLeadingAndTrailingSpaces(char *oneline) {
return t;
}
static int DisplayAll(const char *restrict const path);
/*
* Read a sysctl setting
@ -163,16 +164,43 @@ static int ReadSetting(const char *restrict const name) {
break;
}
} else {
while(fgets(inbuf, 1024, fp)) {
/* already has the \n in it */
if (PrintName) {
fprintf(stdout, "%s = %s", outname, inbuf);
} else {
if (!PrintNewline) {
char *nlptr = strchr(inbuf,'\n');
if(nlptr) *nlptr='\0';
if(fgets(inbuf, sizeof inbuf - 1, fp)) {
// this loop is required, see
// /sbin/sysctl -a | egrep -6 dev.cdrom.info
do {
if (NameOnly) {
fprintf(stdout, "%s\n", outname);
} else {
/* already has the \n in it */
if (PrintName) {
fprintf(stdout, "%s = %s", outname, inbuf);
} else {
if (!PrintNewline) {
char *nlptr = strchr(inbuf,'\n');
if(nlptr) *nlptr='\0';
}
fprintf(stdout, "%s", inbuf);
}
}
fprintf(stdout, "%s", inbuf);
} while(fgets(inbuf, sizeof inbuf - 1, fp));
} else {
switch(errno) {
case EACCES:
fprintf(stderr, ERR_PERMISSION_DENIED, outname);
rc = -1;
break;
case EISDIR:{
size_t len;
len = strlen(tmpname);
tmpname[len] = '/';
tmpname[len+1] = '\0';
rc = DisplayAll(tmpname);
break;
}
default:
fprintf(stderr, ERR_UNKNOWN_READING, errno, outname);
rc = -1;
break;
}
}
fclose(fp);
@ -189,12 +217,11 @@ static int ReadSetting(const char *restrict const name) {
* Display all the sysctl settings
*
*/
static int DisplayAll(const char *restrict const path, bool ShowTableUtil) {
static int DisplayAll(const char *restrict const path) {
int rc = 0;
int rc2;
DIR *restrict dp;
struct dirent *restrict de;
char *restrict tmpdir;
struct stat ts;
dp = opendir(path);
@ -203,17 +230,19 @@ static int DisplayAll(const char *restrict const path, bool ShowTableUtil) {
fprintf(stderr, ERR_OPENING_DIR, path);
rc = -1;
} else {
readdir(dp); readdir(dp); /* skip . and .. */
readdir(dp); // skip .
readdir(dp); // skip ..
while (( de = readdir(dp) )) {
char *restrict tmpdir;
tmpdir = (char *restrict)malloc(strlen(path)+strlen(de->d_name)+2);
sprintf(tmpdir, "%s%s", path, de->d_name);
rc2 = stat(tmpdir, &ts); /* should check this return code */
rc2 = stat(tmpdir, &ts);
if (rc2 != 0) {
perror(tmpdir);
} else {
if (S_ISDIR(ts.st_mode)) {
strcat(tmpdir, "/");
DisplayAll(tmpdir, ShowTableUtil);
DisplayAll(tmpdir);
} else {
rc |= ReadSetting(tmpdir+strlen(PROC_PATH));
}
@ -300,13 +329,17 @@ static int WriteSetting(const char *setting) {
fprintf(stderr, ERR_UNKNOWN_WRITING, errno, outname);
}
if (rc==0 && !Quiet) {
if (PrintName) {
fprintf(stdout, "%s = %s\n", outname, value);
if (NameOnly) {
fprintf(stdout, "%s\n", outname);
} else {
if (PrintNewline)
fprintf(stdout, "%s\n", value);
else
fprintf(stdout, "%s", value);
if (PrintName) {
fprintf(stdout, "%s = %s\n", outname, value);
} else {
if (PrintNewline)
fprintf(stdout, "%s\n", value);
else
fprintf(stdout, "%s", value);
}
}
}
}
@ -364,6 +397,7 @@ static int Preload(const char *restrict const filename) {
while ((*value == ' ' || *value == '\t') && *value != 0)
value++;
// should NameOnly affect this?
sprintf(buffer, "%s=%s", name, value);
rc |= WriteSetting(buffer);
}
@ -421,6 +455,9 @@ int main(int argc, char **argv) {
case 'e':
IgnoreError = true;
break;
case 'N':
NameOnly = true;
break;
case 'w':
SwitchesAllowed = false;
WriteMode = true;
@ -438,7 +475,7 @@ int main(int argc, char **argv) {
case 'A': /* the above, including "opaques" (would be unprintable) */
case 'X': /* the above, with opaques completly printed in hex */
SwitchesAllowed = false;
return DisplayAll(PROC_PATH, ((*argv)[1] == 'a') ? false : true);
return DisplayAll(PROC_PATH);
case 'V':
fprintf(stdout, "sysctl (%s)\n",procps_version);
exit(0);
@ -450,6 +487,8 @@ int main(int argc, char **argv) {
return Usage(me);
}
} else {
if (NameOnly && Quiet) // nonsense
return Usage(me);
SwitchesAllowed = false;
if (WriteMode)
ReturnCode = WriteSetting(*argv);