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library: add a single vector string choice for 'environ'

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In preparation for top scrollable environment display,
the new flag PROC_EDITENVRCVT was added to mirror the
existing single vector string handling for cgroup and
cmdline.

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner 2012-07-01 00:00:11 -05:00 committed by Craig Small
parent a2086dfdf6
commit 348e6091cb
2 changed files with 25 additions and 7 deletions
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31
proc/readproc.c
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@ -600,7 +600,7 @@ static char** file2strvec(const char* directory, const char* what) {
// this is the former under utilized 'read_cmdline', which has been
// generalized in support of these new libproc flags:
// PROC_EDITCGRPCVT, PROC_EDITCMDLCVT
// PROC_EDITCGRPCVT, PROC_EDITCMDLCVT and PROC_EDITENVRCVT
static int read_unvectored(char *restrict const dst, unsigned sz, const char* whom, const char *what, char sep) {
char path[PROCPATHLEN];
int fd;
@ -690,6 +690,17 @@ static void fill_cmdline_cvt (const char* directory, proc_t *restrict p) {
#undef uFLG
}
// This routine reads an 'environ' for the designated proc_t and
// guarantees the caller a valid proc_t.environ pointer.
static void fill_environ_cvt (const char* directory, proc_t *restrict p) {
int whackable_int = MAX_BUFSZ;
dst_buffer[0] = '\0';
if (read_unvectored(src_buffer, MAX_BUFSZ, directory, "environ", ' '))
escape_str(dst_buffer, src_buffer, MAX_BUFSZ, &whackable_int);
p->environ = vectorize_this_str(dst_buffer[0] ? dst_buffer : "-");
}
// warning: interface may change
int read_cmdline(char *restrict const dst, unsigned sz, unsigned pid) {
char path[PROCPATHLEN];
@ -781,9 +792,12 @@ static proc_t* simple_readproc(PROCTAB *restrict const PT, proc_t *restrict cons
}
}
if (unlikely(flags & PROC_FILLENV)) // read /proc/#/environ
p->environ = file2strvec(path, "environ");
else
if (unlikely(flags & PROC_FILLENV)) { // read /proc/#/environ
if (flags & PROC_EDITENVRCVT)
fill_environ_cvt(path, p);
else
p->environ = file2strvec(path, "environ");
} else
p->environ = NULL;
if (flags & (PROC_FILLCOM|PROC_FILLARG)) { // read /proc/#/cmdline
@ -890,9 +904,12 @@ static proc_t* simple_readtask(PROCTAB *restrict const PT, const proc_t *restric
if (flags & PROC_FILLSUPGRP)
supgrps_from_supgids(t);
#endif
if (unlikely(flags & PROC_FILLENV)) // read /proc/#/task/#/environ
t->environ = file2strvec(path, "environ");
else
if (unlikely(flags & PROC_FILLENV)) { // read /proc/#/task/#/environ
if (flags & PROC_EDITENVRCVT)
fill_environ_cvt(path, t);
else
t->environ = file2strvec(path, "environ");
} else
t->environ = NULL;
if (flags & (PROC_FILLCOM|PROC_FILLARG)) { // read /proc/#/task/#/cmdline

1
proc/readproc.h
View File

@ -272,6 +272,7 @@ extern proc_t * get_proc_stats(pid_t pid, proc_t *p);
#define PROC_EDITCGRPCVT 0x10000 // edit `cgroup' as single vector
#define PROC_EDITCMDLCVT 0x20000 // edit `cmdline' as single vector
#define PROC_EDITENVRCVT 0x40000 // edit `environ' as single vector
// it helps to give app code a few spare bits
#define PROC_SPARE_1 0x01000000