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- When reading VM stats, provide proper size argument to sysctl.

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- While here, remove unused arguments from mysysctl().
This commit is contained in:
Gleb Smirnoff 2017-04-21 00:00:23 +00:00
parent 795cd431cb
commit 89aa578fde
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=317234
1 changed files with 16 additions and 17 deletions
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33
usr.bin/vmstat/vmstat.c
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@ -413,12 +413,11 @@ main(int argc, char *argv[])
}
static int
mysysctl(const char *name, void *oldp, size_t *oldlenp,
void *newp, size_t newlen)
mysysctl(const char *name, void *oldp, size_t *oldlenp)
{
int error;
error = sysctlbyname(name, oldp, oldlenp, newp, newlen);
error = sysctlbyname(name, oldp, oldlenp, NULL, 0);
if (error != 0 && errno != ENOMEM)
xo_err(1, "sysctl(%s)", name);
return (error);
@ -541,10 +540,12 @@ fill_vmmeter(struct __vmmeter *vmmp)
GET_COUNTER(v_kthreadpages);
#undef GET_COUNTER
} else {
size_t size = sizeof(uint64_t);
size_t size;
#define GET_VM_STATS(cat, name) \
mysysctl("vm.stats." #cat "." #name, &vmmp->name, &size, NULL, 0)
#define GET_VM_STATS(cat, name) do { \
size = sizeof(vmmp->name); \
mysysctl("vm.stats." #cat "." #name, &vmmp->name, &size); \
} while (0)
/* sys */
GET_VM_STATS(sys, v_swtch);
GET_VM_STATS(sys, v_trap);
@ -609,7 +610,7 @@ fill_vmtotal(struct vmtotal *vmtp)
xo_errx(1, "not implemented");
} else {
size_t size = sizeof(*vmtp);
mysysctl("vm.vmtotal", vmtp, &size, NULL, 0);
mysysctl("vm.vmtotal", vmtp, &size);
if (size != sizeof(*vmtp))
xo_errx(1, "vm.total size mismatch");
}
@ -633,14 +634,14 @@ getcpuinfo(u_long *maskp, int *maxidp)
mask = 0;
ncpus = 0;
size = sizeof(maxcpu);
mysysctl("kern.smp.maxcpus", &maxcpu, &size, NULL, 0);
mysysctl("kern.smp.maxcpus", &maxcpu, &size);
if (size != sizeof(maxcpu))
xo_errx(1, "sysctl kern.smp.maxcpus");
size = sizeof(long) * maxcpu * CPUSTATES;
times = malloc(size);
if (times == NULL)
xo_err(1, "malloc %zd bytes", size);
mysysctl("kern.cp_times", times, &size, NULL, 0);
mysysctl("kern.cp_times", times, &size);
maxid = (size / CPUSTATES / sizeof(long)) - 1;
for (i = 0; i <= maxid; i++) {
empty = 1;
@ -731,7 +732,7 @@ dovmstat(unsigned int interval, int reps)
struct clockinfo clockrate;
size = sizeof(clockrate);
mysysctl("kern.clockrate", &clockrate, &size, NULL, 0);
mysysctl("kern.clockrate", &clockrate, &size);
if (size != sizeof(clockrate))
xo_errx(1, "clockrate size mismatch");
hz = clockrate.hz;
@ -751,13 +752,13 @@ dovmstat(unsigned int interval, int reps)
xo_errx(1, "kvm_getcptime: %s", kvm_geterr(kd));
} else {
size = sizeof(cur.cp_time);
mysysctl("kern.cp_time", &cur.cp_time, &size, NULL, 0);
mysysctl("kern.cp_time", &cur.cp_time, &size);
if (size != sizeof(cur.cp_time))
xo_errx(1, "cp_time size mismatch");
}
if (Pflag) {
size = size_cp_times;
mysysctl("kern.cp_times", cur_cp_times, &size, NULL, 0);
mysysctl("kern.cp_times", cur_cp_times, &size);
if (size != size_cp_times)
xo_errx(1, "cp_times mismatch");
}
@ -1110,7 +1111,7 @@ dosum(void)
kread(X_NCHSTATS, &lnchstats, sizeof(lnchstats));
} else {
size_t size = sizeof(lnchstats);
mysysctl("vfs.cache.nchstats", &lnchstats, &size, NULL, 0);
mysysctl("vfs.cache.nchstats", &lnchstats, &size);
if (size != sizeof(lnchstats))
xo_errx(1, "vfs.cache.nchstats size mismatch");
}
@ -1300,8 +1301,7 @@ read_intrcnts(unsigned long **intrcnts)
*intrcnts = reallocf(*intrcnts, intrcntlen);
if (*intrcnts == NULL)
err(1, "reallocf()");
if (mysysctl("hw.intrcnt",
*intrcnts, &intrcntlen, NULL, 0) == 0)
if (mysysctl("hw.intrcnt", *intrcnts, &intrcntlen) == 0)
break;
}
}
@ -1369,8 +1369,7 @@ dointr(unsigned int interval, int reps)
for (intrnames = NULL, inamlen = 1024; ; inamlen *= 2) {
if ((intrnames = reallocf(intrnames, inamlen)) == NULL)
xo_err(1, "reallocf()");
if (mysysctl("hw.intrnames",
intrnames, &inamlen, NULL, 0) == 0)
if (mysysctl("hw.intrnames", intrnames, &inamlen) == 0)
break;
}
}