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A signal that has been sent but not yet received is called a pending signal. At any point in time, there can be at most one pending signal of a partic 阅读全文
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Putting Processes to Sleep The sleep function suspends a process for a specified period of time. Sleep returns zero if the requested amount of time ha 阅读全文
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Process Control Obtaining Process IDs Each process has a unique positive (nonzero) process ID (PID). The getpid function returns the PID of the callin 阅读全文
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Processes The classic definition of a process is an instance of a program in execution. Each program in the system runs in the context of some process 阅读全文
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Faults Faults result from error conditions that a handler might be able to correct. When a fault occurs, the processor transfers control to the fault 阅读全文
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different levels of ECF: In general, we refer to these abrupt changes as exceptional control flow (ECF). Exceptional control flow occurs at all levels 阅读全文
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Loading and Linking Shared Libraries from Applications Up to this point, we have discussed the scenario in which the dynamic linker loads and links sh 阅读全文
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Executable Object Files The format of an executable object file is similar to that of a relocatable object file. The ELF header describes the overall 阅读全文
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ref: http://www.linfo.org/free.html https://www.cnblogs.com/coldplayerest/archive/2010/02/20/1669949.html Memory consists of mainly of random access m 阅读全文
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Relocation Once the linker has completed the symbol resolution step, it has associated each symbol reference in the code with exactly one symbol defin 阅读全文