What This Function Bind() Does


  • 23 Jan, 2012

    Giving a Socket a Name - bind()#include <sys/types.h>#include <sys/socket.h>int bind(int s, struct sockaddr *name, int namelen)Recall that, using socketpair(), sockets could only be shared between parent and child processes or children of the same parent. With a name attached to the socket, any process on the system can describe (and use) it.In a call to bind(), s is the file descriptor for the socket, obtained from the call to socket(). name is a pointer to a structure of type sockaddr. If the address family is AF_UNIX (as specified when the socket is created), the structure is defined as follows: struct sockaddr { u_short sa_family; char sa_data[14]; };name.sa_family should be AF_UNIX. name.sa_data should contain up to 14 bytes of a file name which will be assigned to the socket. namelen gives the actual length of name, that is, the length of the initialized contents of the data structure.A value of 0 is return on success. On failure, -1 is returned with errno describing the error.Example:struct sockaddr name;int s;name.sa_family = AF_UNIX;strcpy(name.sa_data, "/tmp/sock");if((s = socket(AF_UNIX, SOCK_STREAM, 0) < 0) {printf("socket create failure %dn", errno); exit(0); }if (bind(s, &name, strlen(name.sa_data) + sizeof(name.sa_family)) < 0) printf("bind failure %dn", errno);

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