diff options
Diffstat (limited to 'pw/pw.c')
| -rw-r--r-- | pw/pw.c | 25 |
1 files changed, 23 insertions, 2 deletions
@@ -26,11 +26,12 @@ #ifndef lint static const char rcsid[] = - "$Id$"; + "$Id: pw.c,v 1.7 1997/10/10 06:23:34 charnier Exp $"; #endif /* not lint */ #include "pw.h" #include <err.h> +#include <fcntl.h> #include <paths.h> #include <sys/wait.h> @@ -49,6 +50,7 @@ static struct cargs arglist; static int getindex(const char *words[], const char *word); static void cmdhelp(int mode, int which); +static int filelock(const char *filename); int @@ -147,7 +149,20 @@ main(int argc, char *argv[]) * Now, let's do the common initialisation */ cnf = read_userconfig(getarg(&arglist, 'C') ? getarg(&arglist, 'C')->val : NULL); - ch = funcs[which] (cnf, mode, &arglist); + + + /* + * Be pessimistic and lock the master passowrd and group + * files right away. Keep it locked for the duration. + */ + if (-1 == filelock(_PATH_GROUP) || -1 == filelock(_PATH_MASTERPASSWD)) + { + ch = EX_IOERR; + } + else + { + ch = funcs[which] (cnf, mode, &arglist); + } /* * If everything went ok, and we've been asked to update @@ -178,6 +193,12 @@ main(int argc, char *argv[]) } static int +filelock(const char *filename) +{ + return open(filename, O_RDONLY | O_EXLOCK, 0); +} + +static int getindex(const char *words[], const char *word) { int i = 0; |