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alarm (2)
  • >> alarm (2) ( Solaris man: Системные вызовы )
  • alarm (2) ( Русские man: Системные вызовы )
  • alarm (2) ( Linux man: Системные вызовы )
  • alarm (3) ( Solaris man: Библиотечные вызовы )
  • alarm (3) ( FreeBSD man: Библиотечные вызовы )
  • alarm (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    alarm - schedule an alarm
    signal
     
    

    SYNOPSIS

    #include <unistd.h>
    
    unsigned int alarm(unsigned int seconds);
    

     

    DESCRIPTION

    The alarm() function causes the system to generate a SIGALRM signal for the process after the number of real-time seconds specified by seconds have elapsed (see signal.h(3HEAD)). Processor scheduling delays may prevent the process from handling the signal as soon as it is generated.

    If seconds is 0, a pending alarm request, if any, is cancelled. If seconds is greater than LONG_MAX/hz, seconds is rounded down to LONG_MAX/hz. The value of hz is normally 100.

    Alarm requests are not stacked; only one SIGALRM generation can be scheduled in this manner; if the SIGALRM signal has not yet been generated, the call will result in rescheduling the time at which the SIGALRM signal will be generated.

    The fork(2) function clears pending alarms in the child process. A new process image created by one of the exec(2) functions inherits the time left to an alarm signal in the old process's image.  

    RETURN VALUES

    If there is a previous alarm request with time remaining, alarm() returns a non-zero value that is the number of seconds until the previous request would have generated a SIGALRM signal. Otherwise, alarm() returns 0.  

    ERRORS

    The alarm() function is always successful; no return value is reserved to indicate an error.  

    ATTRIBUTES

    See attributes(5) for descriptions of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    Interface StabilityStandard

    MT-Level

     

    SEE ALSO

    exec(2), fork(2), signal.h(3HEAD), attributes(5), standards(5)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    ATTRIBUTES
    SEE ALSO


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