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shmat

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ada-dmitry
2023-10-04 10:55:29 +03:00
parent 7cd26f4a5d
commit e19c8aa5c5
5 changed files with 180 additions and 0 deletions
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TMP/Practice/04.10/output/mykey
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TMP/Practice/04.10/output/mykey2
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TMP/Practice/04.10/shmat/svshm_string.h
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#include <stdio.h>
#include <stdlib.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <unistd.h>
static void
usage(const char *pname)
{
fprintf(stderr, "Usage: %s [-cx] pathname proj-id num-sems\n",
pname);
fprintf(stderr, " -c Use IPC_CREAT flag\n");
fprintf(stderr, " -x Use IPC_EXCL flag\n");
exit(EXIT_FAILURE);
}
int main(int argc, char *argv[])
{
int semid, nsems, flags, opt;
key_t key;
flags = 0;
while ((opt = getopt(argc, argv, "cx")) != -1)
{
switch (opt)
{
case 'c':
flags |= IPC_CREAT;
break;
case 'x':
flags |= IPC_EXCL;
break;
default:
usage(argv[0]);
}
}
if (argc != optind + 3)
usage(argv[0]);
key = ftok(argv[optind], argv[optind + 1][0]);
if (key == -1)
{
perror("ftok");
exit(EXIT_FAILURE);
}
nsems = atoi(argv[optind + 2]);
semid = semget(key, nsems, flags | 0600);
if (semid == -1)
{
perror("semget");
exit(EXIT_FAILURE);
}
printf("ID = %d\n", semid);
exit(EXIT_SUCCESS);
}
TMP/Practice/04.10/shmat/svshm_string_read.c
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#include <stdio.h>
#include <stdlib.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <unistd.h>
static void
usage(const char *pname)
{
fprintf(stderr, "Usage: %s [-cx] pathname proj-id num-sems\n",
pname);
fprintf(stderr, " -c Use IPC_CREAT flag\n");
fprintf(stderr, " -x Use IPC_EXCL flag\n");
exit(EXIT_FAILURE);
}
int main(int argc, char *argv[])
{
int semid, nsems, flags, opt;
key_t key;
flags = 0;
while ((opt = getopt(argc, argv, "cx")) != -1)
{
switch (opt)
{
case 'c':
flags |= IPC_CREAT;
break;
case 'x':
flags |= IPC_EXCL;
break;
default:
usage(argv[0]);
}
}
if (argc != optind + 3)
usage(argv[0]);
key = ftok(argv[optind], argv[optind + 1][0]);
if (key == -1)
{
perror("ftok");
exit(EXIT_FAILURE);
}
nsems = atoi(argv[optind + 2]);
semid = semget(key, nsems, flags | 0600);
if (semid == -1)
{
perror("semget");
exit(EXIT_FAILURE);
}
printf("ID = %d\n", semid);
exit(EXIT_SUCCESS);
}
TMP/Practice/04.10/shmat/svshm_string_write.c
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#include <stdio.h>
#include <stdlib.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <unistd.h>
static void
usage(const char *pname)
{
fprintf(stderr, "Usage: %s [-cx] pathname proj-id num-sems\n",
pname);
fprintf(stderr, " -c Use IPC_CREAT flag\n");
fprintf(stderr, " -x Use IPC_EXCL flag\n");
exit(EXIT_FAILURE);
}
int main(int argc, char *argv[])
{
int semid, nsems, flags, opt;
key_t key;
flags = 0;
while ((opt = getopt(argc, argv, "cx")) != -1)
{
switch (opt)
{
case 'c':
flags |= IPC_CREAT;
break;
case 'x':
flags |= IPC_EXCL;
break;
default:
usage(argv[0]);
}
}
if (argc != optind + 3)
usage(argv[0]);
key = ftok(argv[optind], argv[optind + 1][0]);
if (key == -1)
{
perror("ftok");
exit(EXIT_FAILURE);
}
nsems = atoi(argv[optind + 2]);
semid = semget(key, nsems, flags | 0600);
if (semid == -1)
{
perror("semget");
exit(EXIT_FAILURE);
}
printf("ID = %d\n", semid);
exit(EXIT_SUCCESS);
}