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Spawn a new process and block the parent
#include <process.h>
pid_t vfork( void );
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
This function spawns a new process and blocks the parent until the
child process calls
execve()
or exits (by calling
_exit()
or abnormally).
A value of zero to the child process, and (later) the child's process ID in the parent.
If an error occurs, no child process is created, and the function returns -1
and sets
errno.
- EAGAIN
- The system-imposed limit on the total number of processes under
execution would be exceeded. This limit is determined
when the system is generated.
- ENOMEM
- There isn't enough memory for the new process.
POSIX 1003.1 XSI
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
No |
Thread |
No |
To avoid a possible deadlock situation, processes that are
children in the middle of a vfork() are never sent
SIGTTOU or SIGTTIN signals;
rather, output or ioctls are allowed and
input attempts result in an EOF indication.
execve(),
_exit(),
fork(),
ioctl(),
sigaction(),
wait()
Processes and Threads
chapter of Getting Started with QNX Neutrino
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