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set.c
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C/C++ Source or Header
|
2005-02-12
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1KB
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78 lines
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <sys/param.h>
#include <sys/sysctl.h>
int main(void){
int sem, nsems, ret;
int sys_name[3], old_semmns, semmns, old_semmsl, semmsl;
size_t old_size;
/*
* 357913942 * 12 = 100000008 (rounds to 8), so the buffer is 8 bytes
* long.
*/
nsems = 357913942;
/* set the max semaphores allowed so that nsems is valid */
sys_name[0] = CTL_KERN;
sys_name[1] = KERN_SEMINFO;
sys_name[2] = KERN_SEMINFO_SEMMNS;
old_size = sizeof(old_semmns);
ret = sysctl(sys_name, 3, &old_semmns, &old_size, NULL, NULL);
if(ret < 0){
perror("sysctl(get semmns)");
return 1;
}
semmns = old_semmns + nsems;
ret = sysctl(sys_name, 3, &old_semmns, &old_size, &semmns,
sizeof(semmns));
if(ret < 0){
perror("sysctl(semmns)");
return 1;
}
sys_name[0] = CTL_KERN;
sys_name[1] = KERN_SEMINFO;
sys_name[2] = KERN_SEMINFO_SEMMSL;
old_size = sizeof(old_semmsl);
ret = sysctl(sys_name, 3, &old_semmsl, &old_size, NULL, NULL);
if(ret < 0){
perror("sysctl(get semmsl)");
return 1;
}
semmsl = old_semmsl + nsems;
ret = sysctl(sys_name, 3, &old_semmsl, &old_size, &semmsl,
sizeof(semmsl));
if(ret < 0){
perror("sysctl(semmsl)");
return 1;
}
sem = semget(IPC_PRIVATE, nsems, IPC_CREAT);
if(sem < 0){
perror("semget");
return 1;
}
printf("Successfully got a semaphore\n");
printf("id = %d\n", sem);
return 0;
}