From e28cade762a84feb67e0864b0e66e380f7cc60d5 Mon Sep 17 00:00:00 2001 From: Joel Brobecker Date: Thu, 10 Nov 2011 16:36:28 +0000 Subject: [PATCH] procfs file descriptor leaks gdb/ChangeLog (from Tom Tromey): * procfs.c (load_syscalls): Make a cleanup. (open_procinfo_files): fd==0 is ok. --- gdb/ChangeLog | 5 +++++ gdb/procfs.c | 23 +++++++++++------------ 2 files changed, 16 insertions(+), 12 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 24bf23f..405ab84 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,8 @@ +2011-11-09 Tom Tromey + + * procfs.c (load_syscalls): Make a cleanup. + (open_procinfo_files): fd==0 is ok. + 2011-11-10 Joel Brobecker * procfs.c (iterate_over_mappings): Call do_cleanups before diff --git a/gdb/procfs.c b/gdb/procfs.c index 2a253a1..4df2610 100644 --- a/gdb/procfs.c +++ b/gdb/procfs.c @@ -605,7 +605,7 @@ open_procinfo_files (procinfo *pi, int which) else strcat (tmp, "/ctl"); fd = open_with_retry (tmp, O_WRONLY); - if (fd <= 0) + if (fd < 0) return 0; /* fail */ pi->ctl_fd = fd; break; @@ -614,7 +614,7 @@ open_procinfo_files (procinfo *pi, int which) return 0; /* There is no 'as' file descriptor for an lwp. */ strcat (tmp, "/as"); fd = open_with_retry (tmp, O_RDWR); - if (fd <= 0) + if (fd < 0) return 0; /* fail */ pi->as_fd = fd; break; @@ -624,7 +624,7 @@ open_procinfo_files (procinfo *pi, int which) else strcat (tmp, "/status"); fd = open_with_retry (tmp, O_RDONLY); - if (fd <= 0) + if (fd < 0) return 0; /* fail */ pi->status_fd = fd; break; @@ -646,13 +646,13 @@ open_procinfo_files (procinfo *pi, int which) #ifdef PIOCTSTATUS /* OSF */ /* Only one FD; just open it. */ - if ((fd = open_with_retry (pi->pathname, O_RDWR)) == 0) + if ((fd = open_with_retry (pi->pathname, O_RDWR)) < 0) return 0; #else /* Sol 2.5, Irix, other? */ if (pi->tid == 0) /* Master procinfo for the process */ { fd = open_with_retry (pi->pathname, O_RDWR); - if (fd <= 0) + if (fd < 0) return 0; /* fail */ } else /* LWP thread procinfo */ @@ -666,7 +666,7 @@ open_procinfo_files (procinfo *pi, int which) return 0; /* fail */ /* Now obtain the file descriptor for the LWP. */ - if ((fd = ioctl (process->ctl_fd, PIOCOPENLWP, &lwpid)) <= 0) + if ((fd = ioctl (process->ctl_fd, PIOCOPENLWP, &lwpid)) < 0) return 0; /* fail */ #else /* Irix, other? */ return 0; /* Don't know how to open threads. */ @@ -878,6 +878,7 @@ load_syscalls (procinfo *pi) prsysent_t header; prsyscall_t *syscalls; int i, size, maxcall; + struct cleanup *cleanups; pi->num_syscalls = 0; pi->syscall_names = 0; @@ -889,6 +890,7 @@ load_syscalls (procinfo *pi) { error (_("load_syscalls: Can't open /proc/%d/sysent"), pi->pid); } + cleanups = make_cleanup_close (sysent_fd); size = sizeof header - sizeof (prsyscall_t); if (read (sysent_fd, &header, size) != size) @@ -904,12 +906,10 @@ load_syscalls (procinfo *pi) size = header.pr_nsyscalls * sizeof (prsyscall_t); syscalls = xmalloc (size); + make_cleanup (free_current_contents, &syscalls); if (read (sysent_fd, syscalls, size) != size) - { - xfree (syscalls); - error (_("load_syscalls: Error reading /proc/%d/sysent"), pi->pid); - } + error (_("load_syscalls: Error reading /proc/%d/sysent"), pi->pid); /* Find maximum syscall number. This may not be the same as pr_nsyscalls since that value refers to the number of entries @@ -963,8 +963,7 @@ load_syscalls (procinfo *pi) pi->syscall_names[callnum][size-1] = '\0'; } - close (sysent_fd); - xfree (syscalls); + do_cleanups (cleanups); } /* Free the space allocated for the syscall names from the procinfo -- 2.7.4