error: expected specifier-qualifier-list before

**chinook86** · 02-29-2008

I am trying to make two linked lists. My nodes are defined as follows:

Code:

typedef struct{
char *message;
int msglength;
pthread_t sender;
mail *next;
}mail;

typedef struct{
pthread_t addr;
char * reply;
int * replylength;
mail *head;
sem_t mailavailable;
sem_t replydone;
mailbox *next;}
mailbox;

This is the error I get on compile.
srr.c:16: error: expected specifier-qualifier-list before ‘mail’
srr.c:26: error: expected specifier-qualifier-list before ‘mailbox’

Any help as always will be greatly appreciated.

**laserlight** · 02-29-2008

The problem is that your structs are unnamed. You need to give them names so you can refer to them within themselves, e.g.,

Code:

typedef struct mail {
    char *message;
    int msglength;
    pthread_t sender;
    struct mail *next;
} mail;

**chinook86** · 03-01-2008

My thanks.

**chinook86** · 03-01-2008

next question.

mailbox *new=malloc(sizeof(mailbox));
if(sem_init(new->mailavailable,0,0));

The program segfaults in the sem_init()

**whiteflags** · 03-01-2008

>> mailbox *new=malloc(sizeof(mailbox));

I wouldn't call any of your variables "new." While allowed in C it isn't very descriptive of what "new" is for. new is also the name of an allocator in C++. I think it's a common enough keyword for you to avoid naming things after it.

>> if(sem_init(new->mailavailable,0,0));

Well it could depend on what sem_int() does, but take note of your semi-colons.

What you have is the equivalent of

Code:

if ( sem_int(new->mailavailable, 0, 0) )
   /** do nothing **/ ;
{
   /** bad stuff **/
   /** improper accessing of "new" because things are executed always **/
}

By the way, no one will be able to tell you where things went wrong if you don't post the other function.

**chinook86** · 03-01-2008

Sorry that was just bad formatting of my code when I pasted it in here. The colons and if statements are fine in my code. sem_init() is a system call so I really don't have any control on what happens in there. I have read the man pages and seem to be making the call correctly.

**chinook86** · 03-01-2008

EDIT Solved I was forgetting to malloc the sem pointers.

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