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104 lines
2.3 KiB
C
104 lines
2.3 KiB
C
/*/ csocket.c
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R. Kent Dybvig May 1998
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Updated by Jamie Taylor, Sept 2016
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Public Domain
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/*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <string.h>
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#include <errno.h>
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#include <signal.h>
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#include <sys/ioctl.h>
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#include <stdio.h>
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#include <unistd.h>
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/* c_write attempts to write the entire buffer, pushing through
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interrupts, socket delays, and partial-buffer writes */
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int c_write(int fd, char *buf, ssize_t start, ssize_t n) {
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ssize_t i, m;
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buf += start;
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m = n;
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while (m > 0) {
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if ((i = write(fd, buf, m)) < 0) {
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if (errno != EAGAIN && errno != EINTR)
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return i;
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} else {
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m -= i;
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buf += i;
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}
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}
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return n;
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}
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/* c_read pushes through interrupts and socket delays */
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int c_read(int fd, char *buf, size_t start, size_t n) {
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int i;
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buf += start;
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for (;;) {
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i = read(fd, buf, n);
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if (i >= 0) return i;
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if (errno != EAGAIN && errno != EINTR) return -1;
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}
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}
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/* bytes_ready(fd) returns true if there are bytes available
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to be read from the socket identified by fd */
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int bytes_ready(int fd) {
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int n;
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(void) ioctl(fd, FIONREAD, &n);
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return n;
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}
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/* socket support */
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/* do_socket() creates a new AF_UNIX socket */
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int do_socket(void) {
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return socket(AF_UNIX, SOCK_STREAM, 0);
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}
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/* do_bind(s, name) binds name to the socket s */
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int do_bind(int s, char *name) {
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struct sockaddr_un sun;
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int length;
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sun.sun_family = AF_UNIX;
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(void) strcpy(sun.sun_path, name);
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length = sizeof(sun.sun_family) + sizeof(sun.sun_path);
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return bind(s, (struct sockaddr*)(&sun), length);
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}
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/* do_accept accepts a connection on socket s */
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int do_accept(int s) {
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struct sockaddr_un sun;
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socklen_t length;
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length = sizeof(sun.sun_family) + sizeof(sun.sun_path);
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return accept(s, (struct sockaddr*)(&sun), &length);
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}
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/* do_connect initiates a socket connection */
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int do_connect(int s, char *name) {
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struct sockaddr_un sun;
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int length;
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sun.sun_family = AF_UNIX;
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(void) strcpy(sun.sun_path, name);
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length = sizeof(sun.sun_family) + sizeof(sun.sun_path);
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return connect(s, (struct sockaddr*)(&sun), length);
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}
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/* get_error returns the operating system's error status */
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char* get_error(void) {
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extern int errno;
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return strerror(errno);
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}
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