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-rw-rw-r--. 1 jreiser jreiser 3125 Aug 14 09:30 shmtest.c
On my system, /usr/include/linux/shm.h says:
-----
#define SHMMAX 0x2000000 /* max shared seg size (bytes) */
#define SHMMIN 1 /* min shared seg size (bytes) */
#define SHMMNI 4096 /* max num of segs system wide */
#define SHMALL (SHMMAX/getpagesize()*(SHMMNI/16))
#define SHMSEG SHMMNI /* max shared segs per process */
-----
In particular, SHMMAX is only 32MiB, so several of the attempted shared segments
are too big. My current actual parameters in
$ cat /proc/sys/kernel/shmall
$ cat /proc/sys/kernel/shmmax
$ cat /proc/sys/kernel/shmmni
agree with the defaults that are in shm.h.
My test program works for me under valgrind-3.8.0 on Fedora 17 x86_64 in 64-bit
mode.
Linux host.domain 3.5.0-2.fc17.x86_64 #1 SMP Mon Jul 30 14:48:59 UTC 2012
x86_64 x86_64 x86_64 GNU/Linux
gcc (GCC) 4.7.0 20120507 (Red Hat 4.7.0-5)
I [attempt to] attach the output that I get:
-rw-rw-r--. 1 jreiser jreiser 9321 Aug 14 09:31 shmtest.out
To see the system calls that valgrind sees:
valgrind --trace-syscalls=yes ...
Of course you can run that under strace, too, in order to verify
that valgrind actually does what it says it is doing:
strace valgrind --trace-syscalls=yes ...
but it is tedious to read the output.
--
#include <sys/types.h>
#include <sys/shm.h>
#include <stdio.h>
#include <stdlib.h>
struct shm_details
{
key_t key;
size_t size;
int shmid;
void *shm;
};
main(int argc,char **argv)
{
int i;
/* default SHMMAX is 32MB */
struct shm_details test_shm[] = {
{0xe300626d, 2147456, -1, NULL },
{0xe300626c, 144271608, -1, NULL}, /* LARGE */
{0xe300626e, 115604, -1, NULL},
{0xe300626f, 118376704, -1, NULL}, /* LARGE */
{0xe300653d, 574592, -1, NULL},
{0xe300653c, 22578504, -1, NULL},
{0xe300653e, 18092, -1, NULL},
{0xe300653f, 208416960, -1, NULL}, /* LARGE */
{0xe30066b9, 2147456, -1, NULL},
{0xe30066b8, 120870984, -1, NULL}, /* LARGE */
{0xe30066ba, 484260, -1, NULL},
{0xe30066bb, 9793648960, -1, NULL}, /* LARGE */
{0xe30068ad, 8438912, -1, NULL},
{0xe30068ac, 553973472, -1, NULL} /* LARGE */
};
int n_err = 0;
int list = (sizeof(test_shm)/sizeof(test_shm[0]));
int shmflg;
int delete=0;
if (argc != 2) {
printf("Usage: ./test_shm -c|-g|-d\n -c for create shared memory\n -g for get shared memory\n -d delete the shared memory\n");
return(0);
}
if (strcmp(argv[1],"-c") == 0) {
shmflg = IPC_CREAT | 0666;
}else if (strcmp(argv[1],"-g") == 0) {
shmflg = 0666;
} else if (strcmp(argv[1],"-d") == 0) {
shmflg = 0666;
delete = 1;
} else {
printf("Usage: ./test_shm -c|-g|-d\n -c for create\n -g for get shared memory\n -d delete the shared memory\n");
return(0);
}
n_err=0;
for (i=0;i < sizeof(test_shm)/sizeof(test_shm[0]); ++i) {
test_shm[i].shmid = shmget(test_shm[i].key, test_shm[i].size, shmflg);
printf("\tid=%#8.8x = shmget(key=%#8.8x, size=%#8.8lx, flag=%#o)\n",
test_shm[i].shmid, test_shm[i].key, test_shm[i].size, shmflg);
if (test_shm[i].shmid == -1) {
perror("shmget");
printf("ERROR: shmget failed for shmkey=0x%)x\n", test_shm[i].key);
++n_err;
}
}
/*delete*/
n_err=0;
if (delete == 1) {
for (i=0;i < sizeof(test_shm)/sizeof(test_shm[0]); ++i) {
struct shmid_ds buf;
int const r = shmctl(test_shm[i].shmid, IPC_RMID, &buf);
printf("\tr=%d = shmctl(id=%#8.8x, op=%x)\n", r, test_shm[i].shmid, IPC_RMID);
if (r!=0) {
perror("shmctl");
printf("ERROR: shmctl failed for shmkey=0x%x)\n", test_shm[i].key);
++n_err;
}
}
printf("INFO: All shared memories are deleted\n");
return n_err;
}
/* Now we attach the segment to our data space. */
n_err=0;
for (i=0;i < sizeof(test_shm)/sizeof(test_shm[0]); ++i) {
test_shm[i].shm = shmat(test_shm[i].shmid, 0, 0);
printf("\t%p = shmat(key=%#8.8x, 0, 0)\n", test_shm[i].shm, test_shm[i].shmid);
if (test_shm[i].shm == (char *) -1) {
perror("shmat");
printf("ERROR: shmat failed for shmkey=0x%x\n", test_shm[i].key);
++n_err;
}
}
n_err=0;
for (i=0;i < sizeof(test_shm)/sizeof(test_shm[0]); ++i) {
int const r = shmdt(test_shm[i].shm);
printf("\t%#x = shmdt(addr=%p)\n", r, test_shm[i].shm);
if (r !=0 ) {
perror("shmat");
printf("ERROR: shmdt failed for shmkey=0x%x\n", test_shm[i].key);
++n_err;
}
return n_err;
}
printf("INFO: exit success\n");
return(0);
}
$ /usr/local/valgrind-3.8.0/bin/valgrind --tool=memcheck --leak-check=full
--track-origins=yes ./shmtest -c
==3629== Memcheck, a memory error detector
==3629== Copyright (C) 2002-2012, and GNU GPL'd, by Julian Seward et al.
==3629== Using Valgrind-3.8.0 and LibVEX; rerun with -h for copyright info
==3629== Command: ./shmtest -c
==3629==
id=0x0035000e = shmget(key=0xe300626d, size=0x0020c480, flag=01666)
id=0xffffffff = shmget(key=0xe300626c, size=0x089968f8, flag=01666)
shmget: Invalid argument
ERROR: shmget failed for shmkey=0x%)x
id=0x00358010 = shmget(key=0xe300626e, size=0x0001c394, flag=01666)
id=0xffffffff = shmget(key=0xe300626f, size=0x070e4900, flag=01666)
shmget: Invalid argument
ERROR: shmget failed for shmkey=0x%)x
id=0x00360011 = shmget(key=0xe300653d, size=0x0008c480, flag=01666)
id=0x00368013 = shmget(key=0xe300653c, size=0x01588548, flag=01666)
id=0x00370014 = shmget(key=0xe300653e, size=0x000046ac, flag=01666)
id=0xffffffff = shmget(key=0xe300653f, size=0x0c6c30c0, flag=01666)
shmget: Invalid argument
ERROR: shmget failed for shmkey=0x%)x
id=0x00378015 = shmget(key=0xe30066b9, size=0x0020c480, flag=01666)
id=0xffffffff = shmget(key=0xe30066b8, size=0x07345848, flag=01666)
shmget: Invalid argument
ERROR: shmget failed for shmkey=0x%)x
id=0x00380016 = shmget(key=0xe30066ba, size=0x000763a4, flag=01666)
id=0xffffffff = shmget(key=0xe30066bb, size=0x247bf3940, flag=01666)
shmget: Invalid argument
ERROR: shmget failed for shmkey=0x%)x
id=0x00388017 = shmget(key=0xe30068ad, size=0x0080c480, flag=01666)
id=0xffffffff = shmget(key=0xe30068ac, size=0x2104f6e0, flag=01666)
shmget: Invalid argument
ERROR: shmget failed for shmkey=0x%)x
0x5028000 = shmat(key=0x0035000e, 0, 0)
0xffffffffffffffff = shmat(key=0xffffffff, 0, 0)
shmat: Invalid argument
ERROR: shmat failed for shmkey=0xe300626c
0x5235000 = shmat(key=0x00358010, 0, 0)
0xffffffffffffffff = shmat(key=0xffffffff, 0, 0)
shmat: Invalid argument
ERROR: shmat failed for shmkey=0xe300626f
0x5252000 = shmat(key=0x00360011, 0, 0)
0x52df000 = shmat(key=0x00368013, 0, 0)
0x4c0f000 = shmat(key=0x00370014, 0, 0)
0xffffffffffffffff = shmat(key=0xffffffff, 0, 0)
shmat: Invalid argument
ERROR: shmat failed for shmkey=0xe300653f
0x6868000 = shmat(key=0x00378015, 0, 0)
0xffffffffffffffff = shmat(key=0xffffffff, 0, 0)
shmat: Invalid argument
ERROR: shmat failed for shmkey=0xe30066b8
0x6a75000 = shmat(key=0x00380016, 0, 0)
0xffffffffffffffff = shmat(key=0xffffffff, 0, 0)
shmat: Invalid argument
ERROR: shmat failed for shmkey=0xe30066bb
0x6aec000 = shmat(key=0x00388017, 0, 0)
0xffffffffffffffff = shmat(key=0xffffffff, 0, 0)
shmat: Invalid argument
ERROR: shmat failed for shmkey=0xe30068ac
0 = shmdt(addr=0x5028000)
==3629==
==3629== HEAP SUMMARY:
==3629== in use at exit: 0 bytes in 0 blocks
==3629== total heap usage: 12 allocs, 12 frees, 6,816 bytes allocated
==3629==
==3629== All heap blocks were freed -- no leaks are possible
==3629==
==3629== For counts of detected and suppressed errors, rerun with: -v
==3629== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 2 from 2)
$ /usr/local/valgrind-3.8.0/bin/valgrind --tool=memcheck --leak-check=full
--track-origins=yes ./shmtest -g
==3630== Memcheck, a memory error detector
==3630== Copyright (C) 2002-2012, and GNU GPL'd, by Julian Seward et al.
==3630== Using Valgrind-3.8.0 and LibVEX; rerun with -h for copyright info
==3630== Command: ./shmtest -g
==3630==
id=0x0035000e = shmget(key=0xe300626d, size=0x0020c480, flag=0666)
id=0xffffffff = shmget(key=0xe300626c, size=0x089968f8, flag=0666)
shmget: No such file or directory
ERROR: shmget failed for shmkey=0x%)x
id=0x00358010 = shmget(key=0xe300626e, size=0x0001c394, flag=0666)
id=0xffffffff = shmget(key=0xe300626f, size=0x070e4900, flag=0666)
shmget: No such file or directory
ERROR: shmget failed for shmkey=0x%)x
id=0x00360011 = shmget(key=0xe300653d, size=0x0008c480, flag=0666)
id=0x00368013 = shmget(key=0xe300653c, size=0x01588548, flag=0666)
id=0x00370014 = shmget(key=0xe300653e, size=0x000046ac, flag=0666)
id=0xffffffff = shmget(key=0xe300653f, size=0x0c6c30c0, flag=0666)
shmget: No such file or directory
ERROR: shmget failed for shmkey=0x%)x
id=0x00378015 = shmget(key=0xe30066b9, size=0x0020c480, flag=0666)
id=0xffffffff = shmget(key=0xe30066b8, size=0x07345848, flag=0666)
shmget: No such file or directory
ERROR: shmget failed for shmkey=0x%)x
id=0x00380016 = shmget(key=0xe30066ba, size=0x000763a4, flag=0666)
id=0xffffffff = shmget(key=0xe30066bb, size=0x247bf3940, flag=0666)
shmget: No such file or directory
ERROR: shmget failed for shmkey=0x%)x
id=0x00388017 = shmget(key=0xe30068ad, size=0x0080c480, flag=0666)
id=0xffffffff = shmget(key=0xe30068ac, size=0x2104f6e0, flag=0666)
shmget: No such file or directory
ERROR: shmget failed for shmkey=0x%)x
0x5028000 = shmat(key=0x0035000e, 0, 0)
0xffffffffffffffff = shmat(key=0xffffffff, 0, 0)
shmat: Invalid argument
ERROR: shmat failed for shmkey=0xe300626c
0x5235000 = shmat(key=0x00358010, 0, 0)
0xffffffffffffffff = shmat(key=0xffffffff, 0, 0)
shmat: Invalid argument
ERROR: shmat failed for shmkey=0xe300626f
0x5252000 = shmat(key=0x00360011, 0, 0)
0x52df000 = shmat(key=0x00368013, 0, 0)
0x4c0f000 = shmat(key=0x00370014, 0, 0)
0xffffffffffffffff = shmat(key=0xffffffff, 0, 0)
shmat: Invalid argument
ERROR: shmat failed for shmkey=0xe300653f
0x6868000 = shmat(key=0x00378015, 0, 0)
0xffffffffffffffff = shmat(key=0xffffffff, 0, 0)
shmat: Invalid argument
ERROR: shmat failed for shmkey=0xe30066b8
0x6a75000 = shmat(key=0x00380016, 0, 0)
0xffffffffffffffff = shmat(key=0xffffffff, 0, 0)
shmat: Invalid argument
ERROR: shmat failed for shmkey=0xe30066bb
0x6aec000 = shmat(key=0x00388017, 0, 0)
0xffffffffffffffff = shmat(key=0xffffffff, 0, 0)
shmat: Invalid argument
ERROR: shmat failed for shmkey=0xe30068ac
0 = shmdt(addr=0x5028000)
==3630==
==3630== HEAP SUMMARY:
==3630== in use at exit: 0 bytes in 0 blocks
==3630== total heap usage: 12 allocs, 12 frees, 6,816 bytes allocated
==3630==
==3630== All heap blocks were freed -- no leaks are possible
==3630==
==3630== For counts of detected and suppressed errors, rerun with: -v
==3630== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 2 from 2)
$ /usr/local/valgrind-3.8.0/bin/valgrind --tool=memcheck --leak-check=full
--track-origins=yes ./shmtest -d
==3631== Memcheck, a memory error detector
==3631== Copyright (C) 2002-2012, and GNU GPL'd, by Julian Seward et al.
==3631== Using Valgrind-3.8.0 and LibVEX; rerun with -h for copyright info
==3631== Command: ./shmtest -d
==3631==
id=0x0035000e = shmget(key=0xe300626d, size=0x0020c480, flag=0666)
id=0xffffffff = shmget(key=0xe300626c, size=0x089968f8, flag=0666)
shmget: No such file or directory
ERROR: shmget failed for shmkey=0x%)x
id=0x00358010 = shmget(key=0xe300626e, size=0x0001c394, flag=0666)
id=0xffffffff = shmget(key=0xe300626f, size=0x070e4900, flag=0666)
shmget: No such file or directory
ERROR: shmget failed for shmkey=0x%)x
id=0x00360011 = shmget(key=0xe300653d, size=0x0008c480, flag=0666)
id=0x00368013 = shmget(key=0xe300653c, size=0x01588548, flag=0666)
id=0x00370014 = shmget(key=0xe300653e, size=0x000046ac, flag=0666)
id=0xffffffff = shmget(key=0xe300653f, size=0x0c6c30c0, flag=0666)
shmget: No such file or directory
ERROR: shmget failed for shmkey=0x%)x
id=0x00378015 = shmget(key=0xe30066b9, size=0x0020c480, flag=0666)
id=0xffffffff = shmget(key=0xe30066b8, size=0x07345848, flag=0666)
shmget: No such file or directory
ERROR: shmget failed for shmkey=0x%)x
id=0x00380016 = shmget(key=0xe30066ba, size=0x000763a4, flag=0666)
id=0xffffffff = shmget(key=0xe30066bb, size=0x247bf3940, flag=0666)
shmget: No such file or directory
ERROR: shmget failed for shmkey=0x%)x
id=0x00388017 = shmget(key=0xe30068ad, size=0x0080c480, flag=0666)
id=0xffffffff = shmget(key=0xe30068ac, size=0x2104f6e0, flag=0666)
shmget: No such file or directory
ERROR: shmget failed for shmkey=0x%)x
r=0 = shmctl(id=0x0035000e, op=0)
r=-1 = shmctl(id=0xffffffff, op=0)
shmctl: Invalid argument
ERROR: shmctl failed for shmkey=0xe300626c)
r=0 = shmctl(id=0x00358010, op=0)
r=-1 = shmctl(id=0xffffffff, op=0)
shmctl: Invalid argument
ERROR: shmctl failed for shmkey=0xe300626f)
r=0 = shmctl(id=0x00360011, op=0)
r=0 = shmctl(id=0x00368013, op=0)
r=0 = shmctl(id=0x00370014, op=0)
r=-1 = shmctl(id=0xffffffff, op=0)
shmctl: Invalid argument
ERROR: shmctl failed for shmkey=0xe300653f)
r=0 = shmctl(id=0x00378015, op=0)
r=-1 = shmctl(id=0xffffffff, op=0)
shmctl: Invalid argument
ERROR: shmctl failed for shmkey=0xe30066b8)
r=0 = shmctl(id=0x00380016, op=0)
r=-1 = shmctl(id=0xffffffff, op=0)
shmctl: Invalid argument
ERROR: shmctl failed for shmkey=0xe30066bb)
r=0 = shmctl(id=0x00388017, op=0)
r=-1 = shmctl(id=0xffffffff, op=0)
shmctl: Invalid argument
ERROR: shmctl failed for shmkey=0xe30068ac)
INFO: All shared memories are deleted
==3631==
==3631== HEAP SUMMARY:
==3631== in use at exit: 0 bytes in 0 blocks
==3631== total heap usage: 12 allocs, 12 frees, 6,816 bytes allocated
==3631==
==3631== All heap blocks were freed -- no leaks are possible
==3631==
==3631== For counts of detected and suppressed errors, rerun with: -v
==3631== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 2 from 2)
$
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