NAME

intro − introduction to system calls

SYNOPSIS

#include <sys/errno.h>

DESCRIPTION

This section describes some of the 4.3BSD system calls.  The calls listed below have been incorporated in Volume 1 (in section 2) of the Programmer’s Reference Manual. 

Most of these calls have one or more error returns.  An error condition is indicated by an otherwise impossible return value.  This is almost always −1; some of the BSD system calls are implemented in the library.  Note that a number of system calls overload the meanings of these error numbers, and that the meanings must be interpreted according to the type and circumstances of the call. 

acct.2getpid.2read.2
brk.2gettimeofday.2readlink.2
chdir.2getuid.2rename.2
chmod.2ioctl.2rmdir.2
chown.2kill.2setpgrp.2
chroot.2link.2symlink.2
close.2lseek.2stat.2
creat.2mkdir.2sync.2
execve.2mknod.2truncate.2
exit.2mount.2umask.2
fcntl.2open.2unlink.2
fork.2pipe.2write.2
gethostname.2profil.2
getpgrp.2ptrace.2

SEE ALSO

intro(3), perror(3)

March 13, 1992