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   getsid    ( 2 )

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Имя (Name)

getsid - get session ID

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Синопсис (Synopsis)

#include <unistd.h>

       pid_t getsid(pid_t pid);

   Feature Test Macro Requirements for glibc (see
   feature_test_macros(7)):

       getsid():
           _XOPEN_SOURCE >= 500
               || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L

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Описание (Description)

getsid(0) returns the session ID of the calling process.
       getsid() returns the session ID of the process with process ID
       pid.  If pid is 0, getsid() returns the session ID of the calling
       process.

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Возвращаемое значение (Return value)

On success, a session ID is returned.  On error, (pid_t) -1 is
       returned, and errno is set to indicate the error.

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Ошибки (Error)

EPERM  A process with process ID pid exists, but it is not in the
              same session as the calling process, and the
              implementation considers this an error.

       ESRCH  No process with process ID pid was found.

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Версии (Versions)

This system call is available on Linux since version 2.0.

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Стандарты (Conforming to)

POSIX.1-2001, POSIX.1-2008, SVr4.

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Примечание (Note)

Linux does not return EPERM.

       See credentials(7) for a description of sessions and session IDs.

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Смотри также (See also)

getpgid(2), setsid(2), credentials(7)

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