getpid

Name

getpid, getppid
- get process identification

Library

libc.lib

Synopsis

#include <sys/types.h>

#include <unistd.h>

pid_t getpid (void);

pid_t getppid (void);

Detailed description

The getpid system call returns the process ID of the calling process. Though the ID is guaranteed to be unique, it should NOT be used for constructing temporary file names, for security reasons; see mkstemp instead.

The getppid system call returns the process ID of the parent of the calling process.

Examples

/**
 * Detailed description : Sample usage of getpid system call
 **/
#include <unistd.h>
int main() 
{
  pid_t pid ;
  if((pid = getpid()) < 0 ) 
  {
     printf("getpid system call failed \n") ;
     return -1 ;
  }
  printf("pid of this process is %d \n " , pid) ;
  return 0 ;
}

Errors

The getpid and getppid system calls are always successful, and no return value is reserved to indicate an error.

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