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setsid |
Portability: | POSIX.1 conforming |
SYNOPSIS | |
DESCRIPTION | |
RETURN VALUE | |
EXAMPLE | |
RELATED FUNCTIONS |
SYNOPSIS |
#include <sys/types.h> #include <unistd.h> pid_t setsid(void);
DESCRIPTION |
setsid
creates a new session. The calling process is its session leader.
The calling process is the process group leader of the new process group;
it must not already be a process group leader. The calling process does not
have a controlling terminal. The calling process begins as the only process
in the new process group and in the new session. The process group ID of
the new process group is equal to the process ID of the caller.
RETURN VALUE |
setsid
returns the value of the new process group ID of the calling
process.
setsid
returns
a
-1
if not successful.
EXAMPLE |
The following code fragment illustrates
the use of
setsid
to create
a new session:
#include <sys/types.h> #include <unistd.h> #include <stdio.h> pid_t pid; . . . printf("The process group ID is %d\n", (int) getpgrp()); if ((pid = setsid()) == -1) perror("setsid error"); else printf("The new process group ID is %d\n", (int) pid); . . .
Note:
Also see the
setpgid
example.
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