Linux is there a read or recv from socket with timeout

Question

How can I try to read data from socket with timeout  I know  select  pselect  poll  has a timeout field  but using of them disables  tcp fast-path  in tcp reno stack   The only idea I have is to use recv fd       MSG DONTWAIT  in a loop

User · Answer

works also after bind operation for WINDOWS  DWORD timeout   timeout in seconds   1000  setsockopt socket  SOL SOCKET  SO RCVTIMEO   const char   amp timeout  sizeof timeout

User · Answer

LINUX  struct timeval tv  tv tv sec   30            30 Secs Timeout tv tv usec   0            Not init ing this can cause strange errors setsockopt sockfd  SOL SOCKET  SO RCVTIMEO   const char   amp tv sizeof struct timeval      WINDOWS  DWORD timeout   SOCKET READ TIMEOUT SEC   1000  setsockopt socket  SOL SOCKET  SO RCVTIMEO   const char   amp timeout  sizeof timeout      NOTE  You have put this setting before bind   function call for proper run

User · Answer

Here s some simple code to add a time out to your recv function using poll in C   struct pollfd fd  int ret   fd fd   mySocket     your socket handler  fd events   POLLIN  ret   poll  amp fd  1  1000      1 second for timeout switch  ret        case -1             Error         break      case 0             Timeout          break      default          recv mySocket buf sizeof buf   0      get your data         break

User · Answer

You can use the setsockopt function to set a timeout on receive operations      SO RCVTIMEO      Sets the timeout value that specifies   the maximum amount of time an input   function waits until it completes  It   accepts a timeval structure with the   number of seconds and microseconds   specifying the limit on how long to   wait for an input operation to   complete  If a receive operation has   blocked for this much time without   receiving additional data  it shall   return with a partial count or errno   set to  EAGAIN  or  EWOULDBLOCK  if no   data is received  The default for this   option is zero  which indicates that a   receive operation shall not time out    This option takes a timeval structure    Note that not all implementations   allow this option to be set       LINUX struct timeval tv  tv tv sec   timeout in seconds  tv tv usec   0  setsockopt sockfd  SOL SOCKET  SO RCVTIMEO   const char   amp tv  sizeof tv       WINDOWS DWORD timeout   timeout in seconds   1000  setsockopt socket  SOL SOCKET  SO RCVTIMEO   const char   amp timeout  sizeof timeout       MAC OS X  identical to Linux  struct timeval tv  tv tv sec   timeout in seconds  tv tv usec   0  setsockopt sockfd  SOL SOCKET  SO RCVTIMEO   const char   amp tv  sizeof tv     Reportedly on Windows this should be done before calling bind  I have verified by experiment that it can be done either before or after bind on Linux and OS X

User · Answer

Install a handler for SIGALRM  then use alarm   or ualarm   before a regular blocking recv     If the alarm goes off  the recv   will return an error with errno set to EINTR

[c] Linux: is there a read or recv from socket with timeout?

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