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cli_conn.c
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cli_conn.c
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#include"apue.h"
#include<sys/socket.h>
#include<sys/un.h>
#include<errno.h>
#define CLI_PATH "/var/tmp/"
#define CLI_PERM S_IRWXU
int cli_conn(const char *name){
int fd,len,err,rval;
struct sockaddr_un un,sun;
int do_unlink=0;
if(strlen(name)>=sizeof(un.sun_path)){
errno=ENAMETOOLONG;
return (-1);
}
if((fd=socket(AF_UNIX,SOCK_STREAM,0))<0)
return (-1);
memset(&un,0,sizeof(un));
un.sun_family=AF_UNIX;
sprintf(un.sun_path,"%s%05ld",CLI_PATH,(long)getpid());
len=offsetof(struct sockaddr_un,sun_path)+strlen(un.sun_path);
unlink(un.sun_path);
if(bind(fd,(struct sockaddr *)&un,len)<0){
rval=-2;
goto errout;
}
if(chmod(un.sun_path,CLI_PERM)<0){
rval=-3;
do_unlink=1;
goto errout;
}
memset(&sun,0,sizeof(sun));
sun.sun_family=AF_UNIX;
strcpy(sun.sun_path,name);
len=offsetof(struct sockaddr_un,sun_path+strlen(name));
if(connect(fd,(struct sockaddr *)&sun,len)<0){
rval=-4;
do_unlink=1;
goto errout;
}
return (fd);
errout:
err=errno;
close(fd);
if(do_unlink)
unlink(un.sun_path);
errno=err;
return rval;
}