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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [shm_open.c] - Rev 301
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/* shm_open - open a shared memory file */ /* Copyright 2002, Red Hat Inc. */ #include <sys/types.h> #include <sys/mman.h> #include <unistd.h> #include <string.h> #include <fcntl.h> #include <limits.h> int shm_open (const char *name, int oflag, mode_t mode) { int fd; char shm_name[PATH_MAX+20] = "/dev/shm/"; /* skip opening slash */ if (*name == '/') ++name; /* create special shared memory file name and leave enough space to cause a path/name error if name is too long */ strlcpy (shm_name + 9, name, PATH_MAX + 10); fd = open (shm_name, oflag, mode); if (fd != -1) { /* once open we must add FD_CLOEXEC flag to file descriptor */ int flags = fcntl (fd, F_GETFD, 0); if (flags >= 0) { flags |= FD_CLOEXEC; flags = fcntl (fd, F_SETFD, flags); } /* on failure, just close file and give up */ if (flags == -1) { close (fd); fd = -1; } } return fd; }
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