Error = Shmget 22 Invalid Argument
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Shmget C
company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions shmget example Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million ipcrm programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Creating my first Unix Server/Client but getting a “shmget: Invalid argument” error and possibly more. [C] up vote 1 down https://scn.sap.com/thread/1710134 vote favorite I am doing a Unix, C assignment. I am creating a Server and a Client which will interact with each other. I am not very experienced with TCP/IP programming so I apologize for being slow in advance. First, I am trying to create a basic layout of my set up. I compile the Client and Server using a Makefile and it works perfectly. However, when I execute the Server, I get http://stackoverflow.com/questions/16630261/creating-my-first-unix-server-client-but-getting-a-shmget-invalid-argument-er this error: shmget: Invalid argument I think it is a problem with IPC resources. I am supposed to remove the IPC resources using atexit() but I don't think I am doing it right. Here is the code for server.c if it helps: #include "server.h" int shmid, semid; struct Shared *shm; int main() { key_t shmkey = 0x6060, semkey = 0x6061; char *s, c; unsigned short zeros[2] = {0, 0}; int srvrFd, clntFd, clntAdrLen, i; //socket struct sockaddr_in srvrAddr, clntAddr; char buf[256]; if(atexit(server_exit) != 0) { perror("failed to attach atexit()"); _exit(EXIT_FAILURE); } /* Create an array of 2 semaphores with key. */ semid = semget(semkey, 2, 0666 | IPC_CREAT); if (semid < 0) { perror("semget"); exit(0); } /* Set the values of semaphores */ argument.array = zeros; if (semctl(semid, 0, SETALL, argument) < 0) { printf("Cannot init semaphore 0.\n"); } /* Create the segment. */ if ((shmid=shmget(shmkey, sizeof(struct Shared), IPC_CREAT|0666))<0) { perror("shmget"); exit(1); } /* Attach the segment to our data space. */ if ((shm=shmat(shmid, NULL, 0))==(struct Shared *)-1) { perror("shmat"); exit(1); } /* Put some things into the shared memory. */ s = shm->text; for (c = 'a'; c<= 'z'; c++) { *s++ = c; } *s = '\0'; shm->number = 123; //socket srvrFd = socket(AF_INET, SOCK_STREAM, 0); if(srvrFd < 0) { perror("socket"); exit(1); } srvrAddr.sin_addr.s_addr = htonl(INA
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting http://stackoverflow.com/questions/15399369/shmget-gives-einval-error ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up shmget() gives EINVAL error up vote 1 down vote favorite I've been having a problem with shmget for a few hours now that I can't seem to figure out. Every time I try to make a call got shmget() invalid argument it always returns with an EINVAL: "Invalid Argument" error. The important parts of the code are as follows: key_t generate_ipc_key() { key_t ipc_key = ftok(__FILE__, KEY); if(ipc_key < 0) { perror("Failed to Generate IPC Key"); exit(IPC_FAILURE); } return ipc_key; } int shared_memory_create(size_t memory_size) { int shm_key = shmget(generate_ipc_key(), memory_size, IPC_CREAT | 0666); if(shm_key < 0) { perror("Failed to Create Shared Memory Key"); exit(CREATE_FAILURE); } return shm_key; } The function is being called with: shm_key = shared_memory_create(sizeof(data_t)); Where data_t is a struct: typedef error = shmget struct { int hCount; int oCount; int bCount; } data_t; Also in case it helps the values for shared memory are: kernal.shmmax = 33554432 kernal.shmall = 2097152 kernal.shmmni = 4096 I'm fairly new to C so I'm sure it's something simple I'm missing however I can't seem to figure it out. Any help is appreciated! I'm not sure exactly what it was, ipcs showed no shared segments and I rebooted and now it works. c linux shared-memory share|improve this question edited Nov 3 '15 at 14:54 Jon Hanna 68.6k682156 asked Mar 14 '13 at 1:00 pal25 44165 This may help. EINVAL != "Invalid argument". EINVAL = A new segment was to be created and size < SHMMIN or size > SHMMAX, or no new segment was to be created, a segment with given key existed, but size is greater than the size of that segment. man page. check the memory_size argument. –yeyo Mar 14 '13 at 1:07 1 @Kira: I'm getting errno 22 which is EINVAL on my system. –pal25 Mar 14 '13 at 1:12 add a comment| 1 Answer 1 active oldest votes up vote 1 down vote The man page says: EINVAL A new segment was to be created and size < SHMMIN or size > SHMMAX, or no new segment was to be created, a segment with given key existed, but size is greater than the size of that segment. So, check if any of these applies. You can run