_NutQueryPid() -- return the process ID of the calling process

SYNOPSIS

#include <nutc.h>

pid_t _NutQueryPid(void);

The _NutQueryPid() function returns the process ID of the calling process. This function differs from getpid() because getpid() returns the Win32 process identifier whereas _NutQueryPid() returns the same process ID that was returned when the process was created. The process ID returned when the process was created (using fork() or vfork()]) differs from the Win32 process identifier after exec() is called.

Use _NutQueryPid() when the process ID must remain constant across uses of exec(). After an exec(), if the application uses its process ID to make use of any IPC resource created before calling exec(), it should use _NutQueryPid() to get the process ID that matches the return value of fork() or vfork().

When using vfork(), no new process is created until exec() is used. Consequently, getpid() and _NutQueryPid() return information about the (parent) process that called vfork().

_NutQueryPid()
return the process ID of the calling process

Function

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_NutQueryPid() return the process ID of the calling process

Function

_NutQueryPid()
return the process ID of the calling process