setsid(2)setsid(2)NAMEsetsid - Set the process group ID
SYNOPSIS
#include <unistd.h>
pid_t setsid
void );
Application developers may want to specify an #include statement for
<sys/types.h> before the one for <unistd.h> if programs are being
developed for multiple platforms. The additional #include statement is
not required on Tru64 UNIX systems or by ISO or XSH standards, but may
be on other vendors' systems that conform to these standards.
STANDARDS
Interfaces documented on this reference page conform to industry stan‐
dards as follows:
setsid(): XSH4.0, XSH4.2, XSH5.0
Refer to the standards(5) reference page for more information about
industry standards and associated tags.
DESCRIPTION
The setsid() function creates a new session when the calling process is
not a process group leader. The calling process then becomes the ses‐
sion leader of this session, becomes the process leader of the new
process group, and has no controlling terminal. The process group ID of
the calling process is set equal to its process ID. The calling process
becomes the only process in the new process group and the only process
in the new session.
RETURN VALUES
Upon successful completion, the setsid function returns the value of
the new process group ID. Otherwise, a value of (pid_t)-1 is returned
and errno is set to indicate the error.
ERRORS
The setsid() function sets errno to the specified values for the fol‐
lowing conditions: The calling process is already the process group
leader, or the process group ID of another process matches the process
ID of the calling process.
SEE ALSO
Functions: getpid(2), getsid(2), setpgid(2)
Standards: standards(5)setsid(2)
