diff options
| -rw-r--r-- | src/posix-io.c | 54 |
1 files changed, 47 insertions, 7 deletions
diff --git a/src/posix-io.c b/src/posix-io.c index e49c71ec..f3361534 100644 --- a/src/posix-io.c +++ b/src/posix-io.c @@ -47,6 +47,12 @@ #include <ctype.h> #include <sys/resource.h> +#if __linux__ +# include <sys/types.h> +# include <dirent.h> +#endif /*__linux__ */ + + #include "util.h" #include "priv-io.h" #include "sema.h" @@ -280,16 +286,50 @@ get_max_fds (void) long int fds = -1; int rc; -#ifdef RLIMIT_NOFILE + /* Under Linux we can figure out the highest used file descriptor by + * reading /proc/self/fd. This is in the common cases much fast than + * for example doing 4096 close calls where almost all of them will + * fail. */ +#ifdef __linux__ { - struct rlimit rl; - rc = getrlimit (RLIMIT_NOFILE, &rl); - if (rc == 0) + DIR *dir = NULL; + struct dirent *dir_entry; + const char *s; + int x; + + dir = opendir ("/proc/self/fd"); + if (dir) { - source = "RLIMIT_NOFILE"; - fds = rl.rlim_max; + while ((dir_entry = readdir (dir))) + { + s = dir_entry->d_name; + if ( *s < '0' || *s > '9') + continue; + x = atoi (s); + if (x > fds) + fds = x; + } + closedir (dir); } - } + if (fds != -1) + { + fds++; + source = "/proc"; + } + } +#endif /* __linux__ */ + +#ifdef RLIMIT_NOFILE + if (fds == -1) + { + struct rlimit rl; + rc = getrlimit (RLIMIT_NOFILE, &rl); + if (rc == 0) + { + source = "RLIMIT_NOFILE"; + fds = rl.rlim_max; + } + } #endif #ifdef RLIMIT_OFILE if (fds == -1) |