intSIGTTOU
-
This is similar to
SIGTTIN,but is generated when a process in a background job attempts to write to the terminal or set its modes. Again,the default action is to stop the process.SIGTTOUis only generated for an attempt to write to the terminal if theTOSTOPoutput mode is set; see section.
SIGKILLsignals and (obviously)SIGCONTsignals. The signals are marked as pending,but not delivered until the process is continued. TheSIGKILLsignal always causes termination of the process and can't be blocked,handled or ignored. You can ignoreSIGCONT,but it always causes the process to be continued anyway if it is stopped. Sending aSIGCONTsignal to a process causes any pending stop signals for that process to be discarded. Likewise,any pendingSIGCONTsignals for a process are discarded when it receives a stop signal.
SIGTSTP,SIGTTIN,orSIGTTOUsignal and does not handle it,the process does not stop. Stopping the process would probably not be very useful,since there is no shell program that will notice it stop and allow the user to continue it. What happens instead depends on the operating system you are using. Some systems may do nothing; others may deliver another signal instead,such asSIGKILLorSIGHUP. In the GNU system,the process dies withSIGKILL; this avoids the problem of many stopped,orphaned processes lying around the system.
intSIGPIPE
-
Broken pipe. If you use pipes or FIFOs,you have to design your application so that one process opens the pipe for reading before another starts writing. If the reading process never starts,or terminates unexpectedly,writing to the pipe or FIFO raises a
SIGPIPEsignal. IfSIGPIPEis blocked,handled or ignored,the offending call fails withEPIPEinstead.
Pipes and FIFO special files are discussed in more detail in section.
Another cause ofSIGPIPEis when you try to output to a socket that isn't connected. See section.
intSIGLOST
-
Resource lost. This signal is generated when you have an advisory lock on an NFS file,and the NFS server reboots and forgets about your lock.
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