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pid_t data type represents process IDs. You can get the
process ID of a process by calling
getpid. The function
getppid returns the process ID of the parent of the current
process (this is also known as the parent process ID). Your
program should include the header files `unistd.h' and
`sys/types.h' to use these functions.
pid_tdata type is a signed integer type which is capable of representing a process ID. In the GNU library, this is an
getpidfunction returns the process ID of the current process.
getppidfunction returns the process ID of the parent of the current process.
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