內容簡介

#include <unistd.h>

pid_t getsid(pid_t pid);

描述

getsid(0) 返回撥用進程的對談ID. getsid(p) 返回與進程ID的進程的對談ID p. (一個進程的對談ID是對談組長的行程群組ID.) On error, (pid_t) -1 will be returned, and errno is set appropriately.

錯誤

標籤	描述
EPERM	A process with process ID p exists, but it is not in the same session as the current process, and the implementation considers this an error.
ESRCH	No process with process ID p was found.

遵循於

SVr4, POSIX.1-2001.

注意

Linux does not return EPERM.

Linux has this system call since Linux 1.3.44. There is libc support since libc 5.2.19.

To get the prototype under glibc, define both _XOPEN_SOURCE and _XOPEN_SOURCE_EXTENDED, or use "#define _XOPEN_SOURCE n" for some integer nlarger than or equal to 500.

另請參閱

getpgid (2)
setsid (2)