#include "rcs_defs.hh"#include "readn.h"#include <unistd.h>#include <sys/types.h>#include <sys/time.h>#include <stddef.h>#include <errno.h>#include <string.h>#include <math.h>#include "rcs_prnt.hh"#include "sokintrf.h"Include dependency graph for readn.c:
Go to the source code of this file.
Functions | |
| int | readn (int fd, void *vptr, int n, double _timeout) |
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Definition at line 50 of file readn.c. 00051 {
00052 int nleft, nread;
00053 char *ptr;
00054 double int_part;
00055 struct timeval timeout_tv;
00056 fd_set read_fd_set;
00057 timeout_tv.tv_sec = (long) _timeout;
00058 timeout_tv.tv_usec = (long) (_timeout * 1000000.0);
00059 if (timeout_tv.tv_usec >= 1000000)
00060 {
00061 timeout_tv.tv_usec = timeout_tv.tv_usec % 1000000;
00062 }
00063 FD_ZERO (&read_fd_set);
00064 RCS_FD_SET (fd, &read_fd_set);
00065
00066
00067 ptr = (char *) vptr;
00068 nleft = n;
00069 while (nleft > 0)
00070 {
00071 if (_timeout > 0.0)
00072 {
00073 switch (dl_select
00074 (fd + 1, &read_fd_set, (fd_set *) NULL, (fd_set *) NULL,
00075 &timeout_tv))
00076 {
00077 case -1:
00078 rcs_print_error ("Error in select: %d -> %s\n", errno,
00079 strerror (errno));
00080 return -1;
00081
00082 case 0:
00083 rcs_print_error ("Read timed out.\n");
00084 return -1;
00085
00086 default:
00087 break;
00088 }
00089 }
00090 if ((nread = read (fd, ptr, nleft)) == -1)
00091 {
00092 rcs_print_error ("Read error: %d = %s\n", errno, strerror (errno));
00093 return (-1); /* error, return < 0 */
00094 }
00095 else if (nread == 0)
00096 {
00097 rcs_print_error ("readn: Premature EOF recieved.\n");
00098 return (-1);
00099 }
00100
00101 nleft -= nread;
00102 ptr += nread;
00103 }
00104 return (n - nleft); /* return >= 0 */
00105 }
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1.2.11.1 written by Dimitri van Heesch,
© 1997-2001