return i;
}
-void setcloexec(int fd) {
- int r=fcntl(fd, F_GETFD);
- if (r<0) fatal_perror("fcntl(,F_GETFD) failed");
- r |= FD_CLOEXEC;
- r=fcntl(fd, F_SETFD, r|FD_CLOEXEC);
- if (r<0) fatal_perror("fcntl(,F_SETFD,|FD_CLOEXEC) failed");
+#define DEFINE_SETFDFLAG(fn,FL,FLAG) \
+void fn(int fd) { \
+ int r=fcntl(fd, F_GET##FL); \
+ if (r<0) fatal_perror("fcntl(,F_GET" #FL ") failed"); \
+ r=fcntl(fd, F_SET##FL, r|FLAG); \
+ if (r<0) fatal_perror("fcntl(,F_SET" #FL ",|" #FLAG ") failed"); \
}
+DEFINE_SETFDFLAG(setcloexec,FD,FD_CLOEXEC);
+DEFINE_SETFDFLAG(setnonblock,FL,O_NONBLOCK);
+
void pipe_cloexec(int fd[2]) {
int r=pipe(fd);
if (r) fatal_perror("pipe");
default: abort();
}
}
+
+enum async_linebuf_result
+async_linebuf_read(struct pollfd *pfd, struct buffer_if *buf,
+ const char **emsg_out)
+{
+ int revents=pfd->revents;
+
+#define BAD(m) do{ *emsg_out=(m); return async_linebuf_broken; }while(0)
+#define BADBIT(b) \
+ if (!(revents & b)) ; else BAD(#b)
+ BADBIT(POLLERR);
+ BADBIT(POLLHUP);
+ BADBIT(POLLNVAL);
+#undef BADBIT
+
+ if (!(revents & POLLIN))
+ return async_linebuf_nothing;
+
+ /* Data structure: A line which has been returned to the user is
+ * stored in buf at base before start. But we retain the usual
+ * buffer meaning of len. So the buffer has valid but used data
+ * from base to start, and valid but waiting data from start to
+ * start+len. */
+
+ BUF_ASSERT_USED(buf);
+
+ /* firstly, eat any previous */
+ if (buf->start != buf->base) {
+ memmove(buf->base,buf->start,buf->size);
+ buf->start=buf->base;
+ }
+
+ uint8_t *searched=buf->base;
+ uint8_t *dataend=buf->base+buf->size;
+ for (;;) {
+ char *newline=memchr(searched,'\n',dataend-searched);
+ if (newline) {
+ *newline=0;
+ buf->start=newline+1;
+ buf->size=dataend-buf->start;
+ return async_linebuf_ok;
+ }
+ searched=dataend;
+ ssize_t space=(buf->start+buf->alloclen)-searched;
+ if (!space) BAD("input line too long");
+ ssize_t r=read(pfd->fd,searched,space);
+ if (r==0) {
+ *searched=0;
+ *emsg_out=buf->size?"no newline at eof":0;
+ buf->start=searched+1;
+ buf->size=0;
+ return async_linebuf_eof;
+ }
+ if (r<0) {
+ if (errno==EINTR)
+ continue;
+ if (iswouldblock(errno))
+ return async_linebuf_nothing;
+ BAD(strerror(errno));
+ }
+ if (memchr(searched,0,r)) BAD("nul in input data");
+ assert(r<=space);
+ dataend+=r;
+ buf->size+=r;
+ }
+
+#undef BAD
+}